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preliminary data sheet october 17, 2011 6a digital pico dlynx tm : non-isolated dc-dc power modules 3vdc ?14.4vdc input; 0.45vdc to 5.5vdc output; 6a output current * ul is a registered trademark of underwriters laboratories, inc. ? csa is a registered trademark of canadian standards association. ? vde is a trademark of verband deutscher elektrotechniker e.v. ** iso is a registered trademark of the international organization of standards document no: ds11-008 ver. 0.33 # the pmbus name and logo are registered trademarks of the system management interface forum (smif) pdf name: pdt006a0x.pdf features ? compliant to rohs eu directive 2002/95/ec (z versions) ? compatible in a pb-free or snpb reflow environment (z versions) ? dosa based ? wide input voltage range (3vdc-14.4vdc) ? output voltage programmable from 0.6vdc to 5.5vdc via external resistor. digitally adjustable down to 0.45vdc ? digital interface through the pmbus tm # protocol ? tunable loop tm to op timize dynamic output voltage response ? flexible output voltage sequencing ez- sequence ? power good signal ? fixed switching frequency with capability of external synchronization ? output overcurrent protection (non-latching) ? overtemperature protection ? remote on/off ? ability to sink and source current ? cost efficient open frame design ? small size: 12.2 mm x 12.2 mm x 7.25 mm (0.48 in x 0.48 in x 0.29 in) ? wide operating temperature range [-40c to 85c] ? ul * 60950-1recognized, csa ? c22.2 no. 60950-1-03 certified, and vde ? 0805:2001-12 (en60950-1) licensed ? iso** 9001 and iso 14001 certified manufacturing facilities applications ? distributed power architectures ? intermediate bus voltage applications ? telecommunications equipment ? servers and storage applications ? networking equipment ? industrial equipment description the 6a digital pico dlynx tm power modules are non-isolated dc-dc converters that deliver up to 6a of output current. these modules operate over a wide range of input voltage (v in = 3vdc-14.4vdc) and provide a precisely regulated output voltage from 0.45vdc to 5.5vdc, programmable via an external resistor and further adjustable through pmbus. features include a digital interface using the pmbus protocol, remote on/off, adjustable output voltage, over current and overtemperature protection. the pmbus interface supports a range of commands to control and monitor the module. the tunable loop tm feature allows the user to optimize the dynamic response of the converter to match the load with reduced amount of output capacitance leading to savings on cost and pwb area. trim vout vs+ gnd rtune ctune rtrim vin co cin vout+ vin+ on/off seq module pgood smbalrt# sig_gnd a ddr1 raddr0 clk data a ddr0 vs- raddr1 gnd sync rohs com p liant
preliminary data sheet october 17, 2011 6a digital pico dlynx tm : non-isolated dc-dc power modules 3 ? 14.4vdc input; 0.45vdc to 5.5vdc output; 6a output current lineage power 2 absolute maximum ratings stresses in excess of the absolute maximum ratings can cause permanent damage to the device. these are absolute stress ratings only, functional operation of the device is not implied at these or any other conditions in excess of those given in the operations sections of the data sheet. exposure to absolute maximum ratings for extended periods can adversely affect the device reliability. parameter device symbol min max unit input voltage all v in -0.3 15 v continuous seq, sync, vs+ all 7 v clk, data, smbalert all 3.6 v operating ambient temperature all t a -40 85 c (see thermal considerations section) storage temperature all t stg -55 125 c electrical specifications unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature conditions. parameter device symbol min typ max unit operating input voltage all v in 3 ? 14.4 vdc maximum input current all i in,max 5 adc (v in =3v to 14v, i o =i o, max ) input no load current (v in = 12vdc, i o = 0, module enabled) v o,set = 0.6 vdc i in,no load 30 ma v o,set = 5vdc i in,no load 90 ma input stand-by current (v in = 12vdc, module disabled) all i in,stand-by 6 ma inrush transient all i 2 t 1 a 2 s input reflected ripple current, peak-to-peak (5hz to 20mhz, 1 h source impedance; v in =0 to 14v , i o = i omax ; see test configurations) all 11.2 map-p input ripple rejection (120hz) all -55 db
preliminary data sheet october 17, 2011 6a digital pico dlynx tm : non-isolated dc-dc power modules 3 ? 14.4vdc input; 0.45vdc to 5.5vdc output; 6a output current lineage power 3 electrical specifications (continued) parameter device symbol min typ max unit output voltage set-point (with 0.1% tolerance for external resistor used to set output voltage) all v o, set -1.0 +1.0 % v o, set output voltage (over all operating input voltage, resistive load, and temperature conditions until end of life) all v o, set -3.0 ? +3.0 % v o, set adjustment range (selected by an external resistor) (some output voltages may not be possible depending on the input voltage ? see feature descriptions section) all v o 0.6 5.5 vdc pmbus adjustable output voltage range all v o ,adj -25 0 +25 %v o,set pmbus output voltage adjustment step size all 0.4 %v o,set remote sense range all 0.5 vdc output regulation (for v o ? 2.5vdc) line (v in =v in, min to v in, max ) all ? +0.4 % v o, set load (i o =i o, min to i o, max ) all ? 10 mv output regulation (for v o < 2.5vdc) line (v in =v in, min to v in, max ) all ? 5 mv load (i o =i o, min to i o, max ) all ? 10 mv temperature (t ref =t a, min to t a, max ) all ? 0.4 % v o, set output ripple and noise on nominal output (v in =v in, nom and i o =i o, min to i o, max co = 0.1 f // 22 f ceramic capacitors) peak-to-peak (5hz to 20mhz bandwidth) all ? 50 100 mv pk-pk rms (5hz to 20mhz bandwidth) all 20 38 mv rms external capacitance 1 without the tunable loop tm esr ? 1 m all c o, max 22 ? 47 f with the tunable loop tm esr ? 0.15 m all c o, max 22 ? 1000 f esr ? 10 m all c o, max 22 ? 3000 f output current (in either sink or source mode) all i o 0 6 adc output current limit inception (hiccup mode) (current limit does not operate in sink mode) all i o, lim 200 % i o,max output short-circuit current all i o, s/c 367 marms (v o ? 250mv) ( hiccup mode ) efficiency v o,set = 0.6vdc 75.6 % v in = 12vdc, t a =25c v o, set = 1.2vdc 85.0 % i o =i o, max , v o = v o,set v o,set = 1.8vdc 88.6 % v o,set = 2.5vdc 90.6 % v o,set = 3.3vdc 92.1 % v o,set = 5.0vdc 93.8 % switching frequency all f sw ? 600 ? khz 1 external capacitors may require using the new tunable loop tm feature to ensure that the module is stable as well as getting the best transient response. see the tunable loop tm section for details.
preliminary data sheet october 17, 2011 6a digital pico dlynx tm : non-isolated dc-dc power modules 3 ? 14.4vdc input; 0.45vdc to 5. 5vdc output; 6a output current lineage power 4 electrical specifications (continued) parameter device symbol min typ max unit frequency synchronization all synchronization frequency range all 510 720 khz high-level input voltage all v ih 2.0 v low-level input voltage all v il 0.4 v input current, sync all i sync 100 na minimum pulse width, sync all t sync 100 ns maximum sync rise time all t sync_sh 100 ns general specifications parameter device min typ max unit calculated mtbf (i o =0.8i o, max , t a =40c) telecordia issue 2 method 1 case 3 all 18,595,797 hours weight ? tbd ? g (oz.) feature specifications unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature conditions. see feature descriptions for additional information. parameter device symbol min typ max unit on/off signal interface (v in =v in, min to v in, max ; open collector or equivalent, signal referenced to gnd) device code with suffix ?4? ? positive logic (see ordering information) logic high (module on) input high current all i ih ? 1 ma input high voltage all v ih 2 ? v in,max v logic low (module off) input low current all i il ? ? 1 ma input low voltage all v il -0.2 ? 0.6 v device code with no suffix ? negative logic (see ordering information) (on/off pin is open collector/drain logic input with external pull-up resistor; signal referenced to gnd) logic high (module off) input high current all i ih ? ? 1 ma input high voltage all v ih 2.0 ? v in, max vdc logic low (module on) input low current all i il ? ? 10 a input low voltage all v il -0.2 ? 0.6 vdc
preliminary data sheet october 17, 2011 6a digital pico dlynx tm : non-isolated dc-dc power modules 3 ? 14.4vdc input; 0.45vdc to 5.5vdc output; 6a output current lineage power 5 feature specifications (cont.) parameter device symbol min typ max units turn-on delay and rise times (v in =v in, nom , i o =i o, max , v o to within 1% of steady state) case 1: on/off input is enabled and then input power is applied (delay from instant at which v in = v in, min until v o = 10% of v o, set ) all tdelay ? 0.4 ? msec case 2: input power is applied for at least one second and then the on/off input is enabled (delay from instant at which von/off is enabled until v o = 10% of v o, set ) all tdelay ? 0.8 ? msec output voltage rise time (time for v o to rise from 10% of vo, set to 90% of vo, set) all trise ? 2.2 ? msec output voltage overshoot (t a = 25 o c v in = v in, min to v in, max ,i o = i o, min to i o, max ) with or without maximum external capacitance 3.0 % v o, set over temperature protection (see thermal considerations section) all t ref tbd c pmbus over temperature warning threshold all t warn 130 c tracking accuracy (power-up: 2v/ms) all v seq ?v o 100 mv (power-down: 2v/ms) all v seq ?v o 100 mv (v in, min to v in, max ; i o, min to i o, max v seq < v o ) input undervoltage lockout turn-on threshold all 2.79 vdc turn-off threshold all 2.58 vdc hysteresis all 0.2 vdc pmbus adjustable input under voltage lockout thresholds all 2.5 14 vdc resolution of adjustable input under voltage threshold all 500 mv pgood (power good) signal interface open drain, v supply 5vdc overvoltage threshold for pgood on all 108 %v o, set overvoltage threshold for pgood off all 105 %v o, set undervoltage threshold for pgood on all 110 %v o, set undervoltage threshold for pgood off all 90 %v o, set pulldown resistance of pgood pin all 50 sink current capability into pgood pin all 5 ma
preliminary data sheet october 17, 2011 6a digital pico dlynx tm : non-isolated dc-dc power modules 3 ? 14.4vdc input; 0.45vdc to 5. 5vdc output; 6a output current lineage power 6 digital interface specifications unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature conditions. see feature descriptions for additional information. parameter conditions symbol min typ max unit pmbus signal interface characteristics input high voltage (clk, data) v ih 2.1 3.6 v input low voltage (clk, data) v il 0.8 v input high level current (clk, data) i ih -10 10 ? a input low level current (clk, data) i il -10 10 ? a output low voltage (clk, data, smbalert#) i out =2ma v ol 0.4 v output high level open drain leakage current (data, smbalert#) v out =3.6v i oh 0 10 ? a pin capacitance c o 0.7 pf pmbus operating frequency range slave mode f pmb 10 400 khz data hold time receive mode transmit mode t hd:dat 0 300 ns data setup time t su:dat 250 ns measurement system characteristics read delay time t dly 153 192 231 s output current measurement range i rng 0 18 a output current measurement resolution i res 62.5 ma output current measurement gain accuracy i acc 5 % output current measurement offset i ofst 0.1 a v out measurement range v out(rng) 0 5.5 v v out measurement resolution v out(res) 16.25 mv v out measurement gain accuracy v out(gain) -2 2 lsb v out measurement offset v out(ofst) -3 3 lsb v in measurement range v in(rng) 0 14.4 v v in measurement resolution v in(res) 32.5 mv v in measurement gain accuracy v in(gain) -2 2 lsb v in measurement offset v in(ofst) -5.5 1.4 lsb
preliminary data sheet october 17, 2011 6a digital pico dlynx tm : non-isolated dc-dc power modules 3 ? 14.4vdc input; 0.45vdc to 5. 5vdc output; 6a output current lineage power 7 characteristic curves the following figures provide typical characteristics for the 6a digital pico dlynx tm at 0.6vo and 25 o c. efficiency, (%) output current, io (a) output current, i o (a) ambient temperature, t a o c figure 1. converter efficiency versus output current. figure 2. derating output current versus ambient temperature and airflow. output voltage v o (v) (10mv/div) output current , output voltage i o (a) (2adiv) v o (v) (5mv/div) time, t (1 s/div) time, t (20 s /div) figure 3. typical output ripple and noise (c o =22 ? f ceramic, v in = 12v, i o = i o,max, ). figure 4. transient response to dynamic load change from 50% to 100% at 12vin, cout=1x47uf + 4x330uf , ctune=33nf , rtune=178 output voltage on/off voltage v o (v) (200mv/div) v on/off (v) (5v/div) output voltage input voltage v o (v) (200mv/div) v in (v) (5v/div) time, t (2ms/div) time, t (2ms/div) figure 5. typical start-up using on/off voltage (i o = i o,max ). figure 6. typical start-up using input voltage (v in = 12v, i o = i o,max ). 50 55 60 65 70 75 80 85 0123456 vin=3.3v vin=14v vin=12v 1.0 2.0 3.0 4.0 5.0 6.0 75 80 85 90 95 100 105 2m/s (400lfm) nc standard part (85 r c) ruggedized (d) part (105 r c) nc 100 300 200 400 nc 100 300 200 400
preliminary data sheet october 17, 2011 6a digital pico dlynx tm : non-isolated dc-dc power modules 3 ? 14.4vdc input; 0.45vdc to 5.5vdc output; 6a output current lineage power 8 characteristic curves the following figures provide typical characteristics for the 6a digital pico dlynx tm at 1.2vo and 25 o c. efficiency, (%) output current, io (a) output current, i o (a) ambient temperature, t a o c figure 7. converter efficiency versus output current. figure 8. derating output current versus ambient temperature and airflow. output voltage v o (v) (20mv/div) output current , output voltage i o (a) (2adiv) v o (v) (10mv/div) time, t (1 s/div) time, t (20 s /div) figure 9. typical output ripple and noise (c o =22 ? f ceramic, v in = 12v, i o = i o,max, ). figure 10. transient response to dynamic load change from 50% to 100% at 12vin, cout=1x47uf + 2x330uf, ctune=12nf, rtune=178 output voltage on/off voltage v o (v) (500mv/div) v on/off (v) (5v/div) output voltage input voltage v o (v) (500mv/div) v in (v) (5v/div) time, t (2ms/div) time, t (2ms/div) figure 1. typical start-up using on/off voltage (i o = i o,max ). figure 12. typical start-up using input voltage (v in = 12v, i o = i o,max ). 50 55 60 65 70 75 80 85 90 95 0123456 vin=3.3v vin=14v vin=12v 1.0 2.0 3.0 4.0 5.0 6.0 75 80 85 90 95 100 105 2m/s (400lfm) nc standard part (85 r c) ruggedized (d) part (105 r c) nc 100 300 200 400 nc 100 300 200 400
preliminary data sheet october 17, 2011 6a digital pico dlynx tm : non-isolated dc-dc power modules 3 ? 14.4vdc input; 0.45vdc to 5. 5vdc output; 6a output current lineage power 9 characteristic curves the following figures provide typical characteristics for the 6a digital pico dlynx tm at 1.8vo and 25 o c. efficiency, (%) output current, io (a) output current, i o (a) ambient temperature, t a o c figure 13. converter efficiency versus output current. figure 14. derating output current versus ambient temperature and airflow. output voltage v o (v) (20mv/div) output current , output voltage i o (a) (2adiv) v o (v) (20mv/div) time, t (1 s/div) time, t (20 s /div) figure 15. typical output ripple and noise (c o =22 ? f ceramic, v in = 12v, i o = i o,max, ). figure 16. transient response to dynamic load change from 50% to 100% at 12vin, cout= 1x47uf + 1x330uf, ctune=4700pf, rtune=178 output voltage on/off voltage v o (v) (500mv/div) v on/off (v) (5v/div) output voltage input voltage v o (v) (500mv/div) v in (v) (5v/div) time, t (2ms/div) time, t (2ms/div) figure 17. typical start-up using on/off voltage (i o = i o,max ). figure 18. typical start-up using input voltage (v in = 12v, i o = i o,max ). 70 75 80 85 90 95 0123456 vin=3.3v vin=14v vin=12v 1.0 2.0 3.0 4.0 5.0 6.0 75 80 85 90 95 100 105 2m/s (400lfm) nc standard part (85 r c) ruggedized (d) part (105 r c) nc 100 300 200 400 nc 100 300 200 400
preliminary data sheet october 17, 2011 6a digital pico dlynx tm : non-isolated dc-dc power modules 3 ? 14.4vdc input; 0.45vdc to 5.5vdc output; 6a output current lineage power 10 characteristic curves the following figures provide typical characteristics for the 6a digital pico dlynx tm at 2.5vo and 25 o c. efficiency, (%) output current, io (a) output current, i o (a) ambient temperature, t a o c figure 19. converter efficiency versus output current. figure 20. derating output current versus ambient temperature and airflow. output voltage v o (v) (20mv/div) output current , output voltage i o (a) (2adiv) v o (v) (20mv/div) time, t (1 s/div) time, t (20 s /div) figure 21. typical output ripple and noise (c o =22 ? f ceramic, v in = 12v, i o = i o,max, ). figure 22. transient response to dynamic load change from 50% to 100% at 12vin, cout = 3x47uf, ctune=3300pf, rtune=178 output voltage on/off voltage v o (v) (1v/div) v on/off (v) (5v/div) output voltage input voltage v o (v) (1v/div) v in (v) (5v/div) time, t (2ms/div) time, t (2ms/div) figure 23. typical start-up using on/off voltage (i o = i o,max ). figure 24. typical start-up using input voltage (v in = 12v, i o = i o,max ). 70 75 80 85 90 95 0123456 vin=4.5v vin=14v vin=12v 1.0 2.0 3.0 4.0 5.0 6.0 75 80 85 90 95 100 105 2m/s (400lfm) nc standard part (85 r c) nc 100 300 200 400 400 300 200 nc 100 ruggedized (d) part (105 r c)
preliminary data sheet october 17, 2011 6a digital pico dlynx tm : non-isolated dc-dc power modules 3 ? 14.4vdc input; 0.45vdc to 5. 5vdc output; 6a output current lineage power 11 characteristic curves the following figures provide typical characteristics for the 6a digital pico dlynx tm at 3.3vo and 25 o c. efficiency, (%) output current, io (a) output current, i o (a) ambient temperature, t a o c figure 25. converter efficiency versus output current. figure 26. derating output current versus ambient temperature and airflow. output voltage v o (v) (20mv/div) output current , output voltage i o (a) (2adiv) v o (v) (20mv/div) time, t (1 s/div) time, t (20 s /div) figure 27. typical output ripple and noise (c o =22 ? f ceramic, v in = 12v, i o = i o,max, ). figure 28 transient response to dynamic load change from 50% to 100% at 12vin, cout= 3x47uf, ctune=3300pf, rtune=178 output voltage on/off voltage v o (v) (1v/div) v on/off (v) (5v/div) output voltage input voltage v o (v) (1v/div) v in (v) (5v/div) time, t (2ms/div) time, t (2ms/div) figure 29. typical start-up using on/off voltage (i o = i o,max ). figure 30. typical start-up using input voltage (v in = 12v, i o = i o,max ). 70 75 80 85 90 95 100 0123456 vin=4.5v vin=14v vin=12v 1.0 2.0 3.0 4.0 5.0 6.0 75 80 85 90 95 100 105 2m/s (400lfm) nc standard part (85 r c) ruggedized (d) part (105 r c) 400 300 200 nc 100 400 300 200 nc 100
preliminary data sheet october 17, 2011 6a digital pico dlynx tm : non-isolated dc-dc power modules 3 ? 14.4vdc input; 0.45vdc to 5.5vdc output; 6a output current lineage power 12 characteristic curves the following figures provide typical characteristics for the 6a digital pico dlynx tm at 5vo and 25 o c. efficiency, (%) output current, io (a) output current, i o (a) ambient temperature, t a o c figure 31. converter efficiency versus output current. figure 32. derating output current versus ambient temperature and airflow. output voltage v o (v) (50mv/div) output current , output voltage i o (a) (2adiv) v o (v) (50mv/div) time, t (1 s/div) time, t (20 s /div) figure 33. typical output ripple and noise (c o =22 ? f ceramic, v in = 12v, i o = i o,max, ). figure 34. transient response to dynamic load change from 50% to 100% at 12vin, cout= 2x47uf, ctune=2200pf, rtune=261 output voltage on/off voltage v o (v) (2v/div) v on/off (v) (5v/div) output voltage input voltage v o (v) (2v/div) v in (v) (5v/div) time, t (2ms/div) time, t (2ms/div) figure 35. typical start-up using on/off voltage (i o = i o,max ). figure 36. typical start-up using input voltage (v in = 12v, i o = i o,max ). 70 75 80 85 90 95 100 0123456 vin=7v vin=14v vin=12v 1.0 2.0 3.0 4.0 5.0 6.0 75 80 85 90 95 100 105 0.5m/s (100lfm) nc ruggedized (d) part (105 r c) standard part (85 r c) nc 100 400 300 200 nc 100 300 200 400
preliminary data sheet october 17, 2011 6a digital pico dlynx tm : non-isolated dc-dc power modules 3 ? 14.4vdc input; 0.45vdc to 5.5vdc output; 6a output current lineage power 13 design considerations input filtering the 6a digital pico dlynx tm module should be connected to a low ac-impedance source. a highly inductive source can affect the stability of the module. an input capacitance must be placed directly adjacent to the input pin of the module, to minimize input ripple voltage and ensure module stability. to minimize input voltage ripple, ceramic capacitors are recommended at the input of the module. figure 37 shows the input ripple voltage for various output voltages at 6a of load current with 1x22 f or 2x22 f ceramic capacitors and an input of 12v. figure 37. input ripple voltage for various output voltages with 1x22 f or 2x22 f ceramic capacitors at the input (6a load). input voltage is 12v. output filtering these modules are designed for low output ripple voltage and will meet the maximum output ripple specification with 0.1 f ceramic and 22 f ceramic capacitors at the output of the module. however, additional output filtering may be required by the system designer for a number of reasons. first, there may be a need to further reduce the output ripple and noise of the module. second, the dynamic response characteristics may need to be customized to a particular load step change. to reduce the output ripple and improve the dynamic response to a step load change, additional capacitance at the output can be used. low esr polymer and ceramic capacitors are recommended to improve the dynamic response of the module. figure 38 provides output ripple information for different external capacitance values at various vo and a full load current of 6a. for stable operation of the module, limit the capacitance to less than the maximum output capacitance as specified in the electrical specification table. optimal performance of the module can be achieved by using the tunable loop tm feature described later in this data sheet. figure 38. output ripple voltage for various output voltages with external 1x22 f, 1x47 f, or 2x47 f ceramic capacitors at the output (6a load). input voltage is 12v. safety considerations for safety agency approval the power module must be installed in compliance with the spacing and separation requirements of the end-use safety agency standards, i.e., ul 60950-1 2nd, csa c22.2 no. 60950-1-07, din en 60950-1:2006 + a11 (vde0805 teil 1 + a11):2009- 11; en 60950-1:2006 + a11:2009-03. for the converter output to be considered meeting the requirements of safety extra-low voltage (selv), the input must meet selv requirements. the power module has extra-low voltage (elv) outputs when all inputs are elv. the input to these units is to be provided with a fuse with a maximum rating of tbd in the positive input lead . 70 80 90 100 110 120 130 140 150 160 170 180 190 0.5 1.5 2.5 3.5 4.5 ripple (mvp-p) output voltage(volts) 1x22uf 2x22uf 0 10 20 30 40 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 ripple (mvp-p) output voltage(volts) 1x22uf ext cap 1x47uf ext cap 2x47uf ext cap
preliminary data sheet october 17, 2011 6a digital pico dlynx tm : non-isolated dc-dc power modules 3 ? 14.4vdc input; 0.45vdc to 5. 5vdc output; 6a output current lineage power 14 analog feature descriptions remote on/off the module can be turned on and off either by using the on/off pin (analog interface) or through the pmbus interface (digital). the module can be configured in a number of ways through the pmbus interface to react to the two on/off inputs: module on/off can be controlled only through the analog interface (digital interface on/off commands are ignored) module on/off can be controlled only through the pmbus interface (analog interface is ignored) module on/off can be controlled by either the analog or digital interface the default state of the module (as shipped from the factory) is to be controlled by the analog interface only. if the digital interface is to be enabled, or the module is to be controlled only through the digital interface, this change must be made through the pmbus. these changes can be made and written to non-volatile memory on the module so that it is remembered for subsequent use. analog on/off the 6a digital pico dlynx tm power modules feature an on/off pin for remote on/off operation. two on/off logic options are available. in the positive logic on/off option, (device code suffix ?4? ? see ordering information), the module turns on during a logic high on the on/off pin and turns off during a logic low. with the negative logic on/off option, (no device code suffix, see ordering information), the module turns off during logic high and on during logic low. the on/off signal should be always referenced to ground. for either on/off logic option, leaving the on/off pin disconnected will turn the module on when input voltage is present. for positive logic modules, the circuit configuration for using the on/off pin is shown in figure 39. when the external transistor q2 is in the off state, the internal transistor q1 is turned on, and the internal pwm #enable signal is pulled low causing the module to be on. when transistor q2 is turned on, the on/off pin is pulled low and the module is off. a suggested value for r pullup is 20k . for negative logic on/off modules, the circuit configuration is shown in fig. 40. the on/off pin should be pulled high with an external pull-up resistor (suggested value for the 3v to 14v input range is 20kohms). when transistor q2 is in the off state, the on/off pin is pulled high, transistor q1 is turned on and the module is off. to turn the module on, q2 is turned on pulling the on/off pin low, turning transistor q1 off resulting in the pwm enable pin going high. digital on/off please see the digital feature descriptions section. figure 39. circuit configuration for using positive on/off logic. figure 40. circuit configuration for using negative on/off logic. monotonic start-up and shutdown the module has monotonic start-up and shutdown behavior for any combination of rated input voltage, output current and operating temperature range. startup into pre-biased output the module can start into a prebiased output as long as the prebias voltage is 0.5v less than the set output voltage. analog output voltage programming the output voltage of the module is programmable to any voltage from 0.6dc to 5.5vdc by connecting a resistor between the trim and sig_gnd pins of the module. certain restrictions apply on the output voltage set point depending on the input voltage. these are shown in the output voltage vs. input voltage set point area plot in fig. 41. the upper limit curve shows that for output voltages lower than 1v, the input voltage must be lower than the maximum of 14.4v. the lower limit curve shows that for output voltages higher than 0.6v, the input voltage needs to be larger than the minimum of 3v. 10k q2 22k q1 22k rpullup +3.3v +vin gnd + _ v on/off on/off i enable dlynx module 10k q2 22k q1 22k rpullup +3.3v +vin gnd _ + i on/off v on/off enable dlynx module
preliminary data sheet october 17, 2011 6a digital pico dlynx tm : non-isolated dc-dc power modules 3 ? 14.4vdc input; 0.45vdc to 5.5v dc output; 6a output current figure 41. output voltage vs. input voltage set point area plot showing limits where the output voltage can be set for different input voltages. v o (+) trim vs f r trim load v in (+) on/off vs+ sig_gnd caution ? do not connect sig_gnd to gnd elsewhere in the layout figure 42. circuit configuration for programming output voltage using an external resistor. without an external resistor between trim and sig_gnd pins, the output of the module will be 0.6vdc.to calculate the value of the trim resistor, rtrim for a desired output voltage, should be as per the following equation: () ? ? o ? ? a ? = k vo rtrim 6 . 0 12 rtrim is the external resistor in k vo is the desired output voltage. table 1 provides rtrim values required for some common output voltages. table 1 v o, set (v) rtrim ( k ) 0.6 open 0.9 40 1.0 30 1.2 20 1.5 13.33 1.8 10 2.5 6.316 3.3 4.444 5.0 2.727 digital output voltage adjustment please see the digital feature descriptions section. remote sense the power module has a remote sense feature to minimize the effects of distribution losses by regulating the voltage between the sense pins (vs+ and vs-). the voltage drop between the sense pins and the vout and gnd pins of the module should not exceed 0.5v. analog voltage margining output voltage margining can be implemented in the module by connecting a resistor, r margin-up , from the trim pin to the ground pin for margining-up the output voltage and by connecting a resistor, r margin-down , from the trim pin to output pin for margining-down. figure 43 shows the circuit configuration for output voltage margining. the pol programming tool, available at www.lineagepower.com under the downloads section, also calculates the values of r margin-up and r margin-down for a specific output voltage and % margin. please consult your local lineage power technical representative for additional details. figure 43. circuit configuration for margining output voltage. digital output voltage margining please see the digital feature descriptions section. 0 2 4 6 8 10 12 14 16 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 input voltage (v) output voltage (v) lower upper vo module sig_gnd trim q1 rtrim rmargin-up q2 rmargin-down
preliminary data sheet october 17, 2011 6a digital pico dlynx tm : non-isolated dc-dc power modules 3 ? 14.4vdc input; 0.45vdc to 5. 5vdc output; 6a output current lineage power 16 output voltage sequencing the power module includes a sequencing feature, ez- sequence that enables users to implement various types of output voltage sequencing in their applications. this is accomplished via an additional sequencing pin. when not using the sequencing feature, leave it unconnected. the voltage applied to the seq pin should be scaled down by the same ratio as used to scale the output voltage down to the reference voltage of the module. this is accomplished by an external resistive divider connected across the sequencing voltage before it is fed to the seq pin as shown in fig. 44. in addition, a small capacitor (suggested value 100pf) should be connected across the lower resistor r1. for all dlynx modules, the minimum recommended delay between the on/off signal and the sequencing signal is 10ms to ensure that the module output is ramped up according to the sequencing signal. this ensures that the module soft-start routine is completed before the sequencing signal is allowed to ramp up. figure 44. circuit showing connection of the sequencing signal to the seq pin. when the scaled down sequencing voltage is applied to the seq pin, the output voltage tracks this voltage until the output reaches the set-point voltage. the final value of the sequencing voltage must be set higher than the set-point voltage of the module. the output voltage follows the sequencing voltage on a one-to-one basis. by connecting multiple modules together, multiple modules can track their output voltages to the voltage applied on the seq pin. to initiate simultaneous shutdown of the modules, the seq pin voltage is lowered in a controlled manner. the output voltage of the modules tracks the voltages below their set-point voltages on a one-to-one basis. a valid input voltage must be maintained until the tracking and output voltages reach ground potential. note that in all digital dlynx series of modules, the pmbus output undervoltage fault will be tripped when sequencing is employed. this will be detected using the status_word and status_vout pmbus commands. in addition, the smbalert# signal will be asserted low as occurs for all faults and warnings. to avoid the module shutting down due to the output undervoltage fault, the module must be set to continue operation without interruption as the response to this fault (see the description of the pmbus command vout_uv_fault_response for additional information). overcurrent protection to provide protection in a fault (output overload) condition, the unit is equipped with internal current-limiting circuitry and can endure current limiting continuously. at the point of current-limit inception, the unit enters hiccup mode. the unit operates normally once the output current is brought back into its specified range. digital adjustable overcurrent warning please see the digital feature descriptions section. overtemperature protection to provide protection in a fault condition, the unit is equipped with a thermal shutdown circuit. the unit will shut down if the overtemperature threshold of 150 o c(typ) is exceeded at the thermal reference point t ref .once the unit goes into thermal shutdown it will then wait to cool before attempting to restart. digital temperature status via pmbus please see the digital feature descriptions section. digitally adjustable output over and under voltage protection please see the digital feature descriptions section. input undervoltage lockout at input voltages below the input undervoltage lockout limit, the module operation is disabled. the module will begin to operate at an input voltage above the undervoltage lockout turn-on threshold. digitally adjustable input undervoltage lockout please see the digital feature descriptions section. digitally adjustable power good thresholds please see the digital feature descriptions section. 100 pf dlynx module r1=rtrim 20k sig_gnd seq seq v
preliminary data sheet october 17, 2011 6a digital pico dlynx tm : non-isolated dc-dc power modules 3 ? 14.4vdc input; 0.45vdc to 5.5v dc output; 6a output current synchronization the module switching frequency can be synchronized to a signal with an external frequency within a specified range. synchronization can be done by using the external signal applied to the sync pin of the module as shown in fig. 45, with the converter being synchronized by the rising edge of the external signal. the electrical specifications table specifies the requirements of the external sync signal. if the sync pin is not used, the module should free run at the default switching frequency. if synchronization is not being used, connect the sync pin to gnd. module sync gnd + f figure 45. external source connections to synchronize switching frequency of the module. measuring output current, output voltage and input voltage please see the digital feature descriptions section. dual layout identical dimensions and pin layout of analog and digital pico dlynx modules permit migration from one to the other without needing to change the layout. to support this, 2 separate trim resistor locations have to be provided in the layout. as shown in fig. 46, for the digital modules, the resistor is connected between the trim pad and sgnd and in the case of the analog module it is connected between trim and gnd. caution ? for digital modules, do not connect sig_gnd to gnd elsewhere in the layout figure 46. connections to support either analog or digital picodlynx on the same layout. tunable loop tm the module has a feature that optimizes transient response of the module called tunable loop tm . external capacitors are usually added to the output of the module for two reasons: to reduce output ripple and noise (see figure 38) and to reduce output voltage deviations from the steady-state value in the presence of dynamic load current changes. adding external capacitance however affects the voltage control loop of the module, typically causing the loop to slow down with sluggish response. larger values of external capacitance could also cause the module to become unstable. the tunable loop tm allows the user to externally adjust the voltage control loop to match the filter network connected to the output of the module. the tunable loop tm is implemented by connecting a series r-c between the vs+ and trim pins of the module, as shown in fig. 47. this r-c allows the user to externally adjust the voltage loop feedback compensation of the module. figure. 47. circuit diagram showing connection of r tume and c tune to tune the control loop of the module. recommended values of r tune and c tune for different output capacitor combinations are given in tables 2 and 3. table 3 shows the recommended values of r tune and c tune for different values of ceramic output capacitors up to 1000uf that might be needed for an application to meet output ripple and noise requirements. selecting r tune and c tune according to table 3 will ensure stable operation of the module. in applications with tight output voltage limits in the presence of dynamic current loading, additional output capacitance will be required. table 3 lists recommended values of r tune and c tune in order to meet 2% output voltage deviation limits for some common output voltages in the presence of a 6a to 6a step change (50% of full load), with an input voltage of 12v. please contact your lineage power technical representative to obtain more details of this feature as well as for guidelines on how to select the right value of external r-c to tune the module for best transient performance and stable operation for other output capacitance values. vs+ module sig_gnd trim vout rtune ctune rtrim co gnd module (pvx006 / pdt006) rtrim1 for digital gnd(pin 7) sig_gnd trim rtrim2 for a nalog
preliminary data sheet october 17, 2011 6a digital pico dlynx tm : non-isolated dc-dc power modules 3 ? 14.4vdc input; 0.45vdc to 5. 5vdc output; 6a output current lineage power 18 table 2. general recommended values of of r tune and c tune for vin=12v and various external ceramic capacitor combinations. co 1x47 f 2x47 f 4x47 f 6x47 f 10x47 f r tune 330 270 220 180 180 c tune 680pf 1800pf 3300pf 4700pf 5600pf table 3. recommended values of r tune and c tune to obtain transient deviation of 2% of vout for a 3a step load with vin=12v. vo 5v 3.3v 2.5v 1.8v 1.2v 0.6v co 2x47 f 3x47 f 3x47 f 1x330 f polymer 2x330 f polymer 4x330 f polymer r tune 270 180 180 180 180 180 c tune 2200pf 3300pf 3300pf 4700pf 12nf 33nf ? v 76mv 48mv 47mv 33mv 18mv 10mv note: the capacitors used in the tunable loop tables are 47 f/3 m ? esr ceramic and 330 f/12 m ? esr polymer capacitors.
preliminary data sheet october 17, 2011 6a digital pico dlynx tm : non-isolated dc-dc power modules 3 ? 14.4vdc input; 0.45vdc to 5.5vdc output; 6a output current lineage power 19 digital feature descriptions pmbus interface capability the 6a digital pico dlynx tm power modules have a pmbus interface that supports both communication and control. the pmbus power management protocol specification can be obtained from www.pmbus.org . the modules support a subset of version 1.1 of the specification (see table 6 for a list of the specific commands supported). most module parameters can be programmed using pmbus and stored as defaults for later use. all communication over the module pmbus interface must support the packet error checking (pec) scheme. the pmbus master must generate the correct pec byte for all transactions, and check the pec byte returned by the module. the module also supports the smbalert response protocol whereby the module can alert the bus master if it wants to talk. for more information on the smbus alert response protocol, see the system management bus (smbus) specification. the module has non-volatile memory that is used to store configuration settings. not all settings programmed into the device are automatically saved into this non- volatile memory, only those specifically identified as capable of being stored can be saved (see table 6 for which command parameters can be saved to non- volatile storage). pmbus data format for commands that set thresholds, voltages or report such quantities, the module supports the ?linear? data format among the three data formats supported by pmbus. the linear data format is a two byte value with an 11-bit, two?s complement mantissa and a 5-bit, two?s complement exponent. the format of the two data bytes is shown below: data byte high 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 data byte low exponent msb mantissa msb the value is of the number is then given by value = mantissa x 2 exponent pmbus addressing the power module can be addressed through the pmbus using a device address. the module has 64 possible addresses (0 to 63 in decimal) which can be set using resistors connected from the addr0 and addr1 pins to sig_gnd. note that some of these addresses (0, 1, 2, 3, 4, 5, 6, 7, 8, 12, 40 in decimal) are reserved according to the smbus specifications and may not be useable. the address is set in the form of two octal (0 to 7) digits, with each pin setting one digit. the addr1 pin sets the high order digit and addr0 sets the low order digit. the resistor values suggested for each digit are shown in table 4 (1% tolerance resistors are recommended). note that if either address resistor value is outside the range specified in table 4, the module will respond to address 127. table 4 digit resistor value (k ? ) 0 10 1 15.4 2 23.7 3 36.5 4 54.9 5 84.5 6 130 7 200 the user must know which i 2 c addresses are reserved in a system for special functions and set the address of the module to avoid interfering with other system operations. both 100khz and 400khz bus speeds are supported by the module. connection for the pmbus interface should follow the high power dc specifications given in section 3.1.3 in the smbus specification v2.0 for the 400khz bus speed or the low power dc specifications in section 3.1.2. the complete smbus specification is available from the smbus web site, smbus.org . addr0 sig_gnd r addr0 r addr1 addr1 figure 48. circuit showing connection of resistors used to set the pmbus address of the module. pmbus enabled on/off the module can also be turned on and off via the pmbus interface. the operat ion command is used to actually turn the module on and off via the pmbus, while the on_off_config command configures the combination of analog on/off pin input and pmbus commands needed to turn the module on and off. bit [7] in the operation command data byte enables the module, with the following functions: 0 : output is disabled 1 : output is enabled this module uses the lower five bits of the on_off_config data byte to set various on/off options as follows:
preliminary data sheet october 17, 2011 6a digital pico dlynx tm : non-isolated dc-dc power modules 3 ? 14.4vdc input; 0.45vdc to 5. 5vdc output; 6a output current lineage power 20 bit position 4 3 2 1 0 access r/w r/w r/w r/w r function pu cmd cpr pol cpa default value 1 0 1 1 1 pu: sets the default to either operate any time input power is present or for the on/off to be controlled by the analog on/off input and the pmbus operation command. this bit is used together with the cp, cmd and on bits to determine startup. bit value action 0 module powers up any time power is present regardless of state of the analog on/off pin 1 module does not power up until commanded by the analog on/off pin and the operation command as programmed in bits [2:0] of the on_off_config register. cmd: the cmd bit controls how the device responds to the operation command. bit value action 0 module ignores the on bit in the operation command 1 module responds to the on bit in the operation command cpr: sets the response of the analog on/off pin. this bit is used together with the cmd, pu and on bits to determine startup. bit value action 0 module ignores the analog on/off pin, i.e. on/off is only controlled through the pmbus via the operation command 1 module requires the analog on/off pin to be asserted to start the unit pmbus adjustable soft start rise time the soft start rise time can be adjusted in the module via pmbus. when setting this parameter, make sure that the charging current for output capacitors can be delivered by the module in addition to any load current to avoid nuisance tripping of the overcurrent protection circuitry during startup. the ton_rise command sets the rise time in ms, and allows choosing soft start times between 600 ? s and 9ms, with possible values listed in table 5. note that the exponent is fixed at -4 (decimal) and the upper two bits of the mantissa are also fixed at 0. table 5 rise time exponent mantissa 600 ? s 11100 00000001010 900 ? s 11100 00000001110 1.2ms 11100 00000010011 1.8ms 11100 00000011101 2.7ms 11100 00000101011 4.2ms 11100 00001000011 6.0ms 11100 00001100000 9.0ms 11100 00010010000 output voltage adjustment using the pmbus the vout_scale_loop parameter is important for a number of pmbus commands related to output voltage trimming, margining, over/under voltage protection and the pgood thresholds. the output voltage of the module is set as the combination of the voltage divider formed by rtrim and a 20k ? upper divider resistor inside the module, and the internal reference voltage of the module. the reference voltage v ref is nominally set at 600mv, and the output regulation voltage is then given by ref out v rtrim rtrim v ? ? o ? ? a + = 20000 hence the module output voltage is dependent on the value of rtrim which is connected external to the module. the information on the output voltage divider ratio is conveyed to the module through the vout_scale_loop parameter which is calculated as follows: rtrim rtrim loop scale vout + = 20000 _ _ the vout_scale_loop parameter is specified using the ?linear? format and two bytes. the upper five bits [7:3] of the high byte are used to set the exponent which is fixed at ?9 (decimal). the remaining three bits of the high byte [2:0] and the eight bits of the lower byte are used for the mantissa. the default value of the mantissa is 00100000000 corresponding to 256 (decimal), corresponding to a divider ratio of 0.5. the maximum value of the mantissa is 512 corresponding to a divider ratio of 1. note that the resolution of the vout_scale_loop command is 0.2%. when pmbus commands are used to trim or margin the output voltage, the value of v ref is what is changed inside the module, which in turn changes the regulated output voltage of the module. the nominal output voltage of the module can be adjusted with a minimum step size of 0.4% over a 25% range from nominal using the vout_trim command over the pmbus. the vout_trim command is used to apply a fixed offset voltage to the output voltage command value
preliminary data sheet october 17, 2011 6a digital pico dlynx tm : non-isolated dc-dc power modules 3 ? 14.4vdc input; 0.45vdc to 5.5vdc output; 6a output current lineage power 21 using the ?linear? mode with the exponent fixed at ?10 (decimal). the value of the offset voltage is given by 10 ) ( 2 _ ? = trim vout v offset out this offset voltage is added to the voltage set through the divider ratio and nominal v ref to produce the trimmed output voltage. the valid range in two?s complement for this command is ?4000h to 3999h. the high order two bits of the high byte must both be either 0 or 1. if a value outside of the +/-25% adjustment range is given with this command, the module will set it?s output voltage to the nominal value (as if vout_trim had been set to 0), assert smbalrt#, set the cml bit in status_byte and the invalid data bit in status_cml. output voltage margining using the pmbus the module can also have its output voltage margined via pmbus commands. the command vout_margin_high sets the margin high voltage, while the command vout_margin_low sets the margin low voltage. both the vout_margin_high and vout_margin_low commands use the ?linear? mode with the exponent fixed at ?10 (decimal). two bytes are used for the mantissa with the upper bit [7] of the high byte fixed at 0. the actual margined output voltage is a combination of the vout_margin_high or vout_margin_low and the vout_trim values as shown below. 10 ) ( 2 ) _ _ _ ( ? + = trim vout high margin vout v mh out 10 ) ( 2 ) _ _ _ ( ? + = trim vout low margin vout v ml out note that the sum of the margin and trim voltages cannot be outside the 25% window around the nominal output voltage. the data associated with vout_margin_high and vout_margin_low can be stored to non-volatile memory using the store_default_all command. the module is commanded to go to the margined high or low voltages using the operation command. bits [5:2] are used to enable margining as follows: 00xx : margin off 0101 : margin low (ignore fault) 0110 : margin low (act on fault) 1001 : margin high (ignore fault) 1010 : margin high (act on fault) pmbus adjustable overcurrent warning the module can provide an overcurrent warning via the pmbus. the threshold for the overcurrent warning can be set using the parameter iout_oc_warn_limit. this command uses the ?linear? data format with a two byte data word where the upper five bits [7:3] of the high byte represent the exponent and the remaining three bits of the high byte [2:0] and the eight bits in the low byte represent the mantissa. the exponent is fixed at ? 1 (decimal). the upper six bits of the mantissa are fixed at 0 while the lower five bits are programmable with a default value of tbd (decimal). the resolution of this warning limit is 500ma. the value of the iout_oc_warn_limit can be stored to non-volatile memory using the store_default_all command. temperature status via pmbus the module can provide information related to temperature of the module through the status_temperature co mmand. the command returns information about whether the pre-set over temperature fault threshold and/or the warning threshold have been exceeded. pmbus adjustable output over and under voltage protection the module has output over and under voltage protection capability. the pmbus command vout_ov_fault_limit is used to set the output over voltage threshold from four possible values: 108%, 110%, 112% or 115% of the commanded output voltage. the command vout_uv_fault_limit sets the threshold that causes an output under voltage fault and can also be selected from four possible values: 92%, 90%, 88% or 85%. the default values are 112% and 88% of commanded output voltage. both commands use two data bytes formatted as two?s complement binary integers. the ?linear? mode is used with the exponent fixed to ?10 (decimal) and the effective over or under voltage trip points given by: 10 ) _ ( 10 ) _ ( 2 ) _ _ _ ( 2 ) _ _ _ ( ? ? = = limit fault uv vout v limit fault ov vout v req uv out req ov out values within the supported range for over and undervoltage detection thresholds will be set to the nearest fixed percentage. note that the correct value for vout_scale_loop must be set in the module for the correct over or under voltage trip points to be calculated. in addition to adjustable output voltage protection, the 6a digital pico dlynx tm module can also be programmed for the response to the fault. the vout_ov_fault response and vout_uv_fault_response commands specify the response to the fault. both these commands use a single data byte with the possible options as shown below. 1. continue operation without interruption (bits [7:6] = 00, bits [5:3] = xxx) 2. continue for four switching cycles and then shut down if the fault is still present, followed by no restart or continuous restart (bits [7:6] = 01, bits [5:3] = 000 means no restart, bits [5:3] = 111 means continuous restart) 3. immediate shut down followed by no restart or continuous restart (bits [7:6] = 10, bits [5:3] = 000 means no restart, bits [5:3] = 111 means continuous restart). 4. module output is disabled when the fault is present and the output is enabled when the
preliminary data sheet october 17, 2011 6a digital pico dlynx tm : non-isolated dc-dc power modules 3 ? 14.4vdc input; 0.45vdc to 5. 5vdc output; 6a output current lineage power 22 fault no longer exists (bits [7:6] = 11, bits [5:3] = xxx). note that separate response choices are possible for output over voltage or under voltage faults. pmbus adjustable input undervoltage lockout the module allows adjustment of the input under voltage lockout and hysteresis. the command vin_on allows setting the input voltage turn on threshold, while the vin_off command sets the input voltage turn off threshold. for the vin_on command, possible values are 2.75v, and 3v to 14v in 0.5v steps. for the vin_off command, possible values are 2.5v to 14v in 0.5v steps. if other values are entered for either command, they will be mapped to the closest of the allowed values. both the vin_on and vin_off commands use the ?linear? format with two data bytes. the upper five bits represent the exponent (fixed at -2) and the remaining 11 bits represent the mantissa. for the mantissa, the four most significant bits are fixed at 0. power good the module provides a power good (pgood) signal that is implemented with an open-drain output to indicate that the output voltage is within the regulation limits of the power module. the p good signal will be de- asserted to a low state if any condition such as overtemperature, overcurrent or loss of regulation occurs that would result in the output voltage going outside the specified thresholds. the pgood thresholds are user selectable via the pmbus (the default values are as shown in the feature specifications section). each threshold is set up symmetrically above and below the nominal value. the power_good_on command sets the output voltage level above which pgood is asserted (lower threshold). for example, with a 1.2v nominal output voltage, the power_good_on threshold can set the lower threshold to 1.14 or 1.1v. doing this will automatically set the upper thresholds to 1.26 or 1.3v. the power_good_off command sets the level below which the pgood command is de-asserted. this command also sets two thresholds symmetrically placed around the nominal output voltage. normally, the power_good_on threshold is set higher than the power_good_off threshold. both power_good_on and power_good_off commands use the ?linear? format with the exponent fixed at ?10 (decimal). the two thresholds are given by 10 ) _ ( 10 ) _ ( 2 ) _ _ ( 2 ) _ _ ( ? ? = = off good power v on good power v off pgood out on pgood out both commands use two data bytes with bit [7] of the high byte fixed at 0, while the remaining bits are r/w and used to set the mantissa using two?s complement representation. both commands also use the vout_scale_loop parameter so it must be set correctly. the default value of power_good_on is set at 1.1035v and that of the power_good_off is set at 1.08v. the values associated with these commands can be stored in non-volatile memory using the store_default_all command. the pgood terminal can be connected through a pullup resistor (suggested value 100k ) to a source of 5vdc or lower. measurement of output current, output voltage and input voltage the module is capable of measuring key module parameters such as output current and voltage and input voltage and providing this information through the pmbus interface. roughly every 200 s, the module makes 16 measurements each of output current, voltage and input voltage. average values of of these 16 measurements are then calculated and placed in the appropriate registers. the values in the registers can then be read using the pmbus interface. measuring output current using the pmbus the module measures current by using the inductor winding resistance as a current sense element. the inductor winding resistance is then the current gain factor used to scale the measured voltage into a current reading. this gain factor is the argument of the iout_cal_gain command, and consists of two bytes in the linear data format. the exponent uses the upper five bits [7:3] of the high data byte in two-s complement format and is fixed at ?15 (decimal). the remaining 11 bits in two?s complement binary format represent the mantissa. during manufacture, each module is calibrated by measuring and storing the current gain factor into non-volatile storage. the current measurement accuracy is also improved by each module being calibrated during manufacture with the offset in the current reading. the iout_cal_offset command is used to store and read the current offset. the argument for this command consists of two bytes composed of a 5-bit exponent (fixed at -4d) and a 11-bit mantissa. this command has a resolution of 62.5ma and a range of -4000ma to +3937.5ma. the read_iout command provides module average output current information. this command only supports positive or current sourced from the module. if the converter is sinking current a reading of 0 is provided. the read_iout command returns two bytes of data in the linear data format. the exponent uses the upper five bits [7:3] of the high data byte in two-s complement format and is fixed at ?4 (decimal). the remaining 11 bits in two?s complement binary format represent the mantissa with the 11 th bit fixed at 0 since only positive numbers are considered valid. note that the current reading provided by the module is not corrected for temperature. the temperature corrected current reading for module temperature t module can be estimated using the following equation u {??o{~~ l u ~qmp4{??
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preliminary data sheet october 17, 2011 6a digital pico dlynx tm : non-isolated dc-dc power modules 3 ? 14.4vdc input; 0.45vdc to 5.5vdc output; 6a output current lineage power 23 where i out_corr is the temperature corrected value of the current measurement, i read_out is the module current measurement value, t ind is the temperature of the inductor winding on the module. since it may be difficult to measure t ind , it may be approximated by an estimate of the module temperature. measuring output voltage using the pmbus the module can provide output voltage information using the read_vout command. the command returns two bytes of data all representing the mantissa while the exponent is fixed at -10 (decimal). during manufacture of the module, offset and gain correction values are written into the non-volatile memory of the module. the command vout_cal_offset can be used to read and/or write the offset (two bytes consisting of a 16-bit mantissa in two?s complement format) while the exponent is always fixed at -10 (decimal). the allowed range for this offset correction is -125 to 124mv. the command vout_cal_gain can be used to read and/or write the gain correction - two bytes consisting of a five-bit exponent (fixed at -8) and a 11-bit mantissa. the range of this correction factor is -0.125v to +0.121v, with a resolution of 0.004v. the corrected output voltage reading is then given by: offset cal vout gain cal vout initial v final v out out _ _ )] _ _ 1 ( ) ( [ ) ( + + = measuring input voltage using the pmbus the module can provide output voltage information using the read_vin command. the command returns two bytes of data in the linear format. the upper five bits [7:3] of the high data form the two?s complement representation of the mantissa which is fixed at ?5 (decimal). the remaining 11 bits are used for two?s complement representation of the mantissa, with the 11 th bit fixed at zero since only positive numbers are valid. during module manufacture, offset and gain correction values are written into the non-volatile memory of the module. the command vin_cal_offset can be used to read and/or write the offset - two bytes consisting of a five-bit exponent (fixed at -5) and a11-bit mantissa in two?s complement format. the allowed range for this offset correction is -2 to 1.968v, and the resolution is 32mv. the command vin_cal_gain can be used to read and/or write the gain correction - two bytes consisting of a five-bit exponent (fixed at -8) and a 11-bit mantissa. the range of this correction factor is -0.125v to +0.121v, with a resolution of 0.004v. the corrected output voltage reading is then given by: offset cal vin gain cal vin initial v final v in in _ _ )] _ _ 1 ( ) ( [ ) ( + + = reading the status of the module using the pmbus the module supports a number of status information commands implemented in pmbus. however, not all features are supported in these commands. a 1 in the bit position indicates the fault that is flagged. status_byte : returns one byte of information with a summary of the most critical device faults. bit position flag default value 7 x 0 6 off 0 5 vout overvoltage 0 4 iout overcurrent 0 3 vin undervoltage 0 2 temperature 0 1 cml (comm. memory fault) 0 0 none of the above 0 status_word : returns two bytes of information with a summary of the module?s fault/warning conditions. low byte bit position flag default value 7 x 0 6 off 0 5 vout overvoltage 0 4 iout overcurrent 0 3 vin undervoltage 0 2 temperature 0 1 cml (comm. memory fault) 0 0 none of the above 0 high byte bit position flag default value 7 vout fault or warning 0 6 iout fault or warning 0 5 x 0 4 x 0 3 power_good# (is negated) 0 2 x 0 1 x 0 0 x 0 status_vout : returns one byte of information relating to the status of the module?s output voltage related faults. bit position flag default value 7 vout ov fault 0 6 x 0
preliminary data sheet october 17, 2011 6a digital pico dlynx tm : non-isolated dc-dc power modules 3 ? 14.4vdc input; 0.45vdc to 5. 5vdc output; 6a output current lineage power 24 5 x 0 4 vout uv fault 0 3 x 0 2 x 0 1 x 0 0 x 0 status_iout : returns one byte of information relating to the status of the module?s output voltage related faults. bit position flag default value 7 iout oc fault 0 6 x 0 5 iout oc warning 0 4 x 0 3 x 0 2 x 0 1 x 0 0 x 0 status_temperature : returns one byte of information relating to the status of the module?s temperature related faults. bit position flag default value 7 ot fault 0 6 ot warning 0 5 x 0 4 x 0 3 x 0 2 x 0 1 x 0 0 x 0 status_cml : returns one byte of information relating to the status of the module?s communication related faults. bit position flag default value 7 invalid/unsupported command 0 6 invalid/unsupported command 0 5 packet error check failed 0 4 x 0 3 x 0 2 x 0 1 other communication fault 0 0 x 0 mfr_vin_min : returns minimum input voltage as two data bytes of information in linear format (upper five bits are exponent ? fixed at -2, and lower 11 bits are mantissa in two?s complement format ? fixed at 12) mfr_vout_min : returns minimum output voltage as two data bytes of information in linear format (upper five bits are exponent ? fixed at -10, and lower 11 bits are mantissa in two?s complement format ? fixed at 614) mfr_specific_00 : returns information related to the type of module and revision number. bits [7:2] in the low byte indicate the module type (000110 corresponds to the pdt006 series of module), while bits [7:3] indicate the revision number of the module. low byte bit position flag default value 7:2 module name 000110 1:0 reserved 10 high byte bit position flag default value 7:3 module revision number none 2:0 reserved 000
preliminary data sheet october 17, 2011 6a digital pico dlynx tm : non-isolated dc-dc power modules 3 ? 14.4vdc input; 0.45vdc to 5. 5vdc output; 6a output current lineage power 25 summary of supported pmbus commands please refer to the pmbus 1.1 specification for more details of these commands. table 6 hex code command brief description non-volatile memory storage 01 operation turn module on or off. also used to margin the output voltage format unsigned binary bit position 7 6 5 4 3 2 1 0 access r/w r r/w r/w r/w r/w r r function on x margin x x default value 0 0 0 0 0 0 x x 02 on_off_config configures the on/off functionality as a combination of analog on/off pin and pmbus commands format unsigned binary bit position 7 6 5 4 3 2 1 0 access r r r r/w r/w r/w r/w r function x x x pu cmd pol cpa x default value 0 0 0 1 0 1 1 1 yes 03 clear_faults clear any fault bits that may have been set, also releases the smbalert# signal if the device has been asserting it. 10 write_protect used to control writing to the module via pmbus. copies the current register setting in the module whose command code matches the value in the data byte into non-volatile memory (eeprom) on the module format unsigned binary bit position 7 6 5 4 3 2 1 0 access r/w r/w r/w x x x x x function bit7 bit6 bit5 x x x x x default value 0 0 0 x x x x x bit5: 0 ? enables all writes as permitted in bit6 or bit7 1 ? disables all writes except the write_protect, operation and on_off_config (bit 6 and bit7 must be 0) bit 6: 0 ? enables all writes as permitted in bit5 or bit7 1 ? disables all writes except for the write_protect and operation commands (bit5 and bit7 must be 0) bit7: 0 ? enables all writes as permitted in bit5 or bit6 1 ? disables all writes except for the write_protect command (bit5 and bit6 must be 0) yes 11 store_default_all copies all current register settings in the module into non-volatile memory (eeprom) on the module. takes about 50ms for the command to execute. 12 restore_default_all restores all current register settings in the module from values in the module non-volatile memory (eeprom) 13 store_default_code copies the current register setting in the module whose command code matches the value in the data byte into non-volatile memory (eeprom) on the module bit position 7 6 5 4 3 2 1 0 access w w w w w w w w function command code 14 restore_default_code restores the current register setting in the module whose command code matches the value in the data byte from the value in the module non-volatile memory (eeprom) bit position 7 6 5 4 3 2 1 0 access w w w w w w w w function command code 20 vout_mode the module has mode set to linear and exponent set to -10. these values cannot be changed bit position 7 6 5 4 3 2 1 0 access r r r r r r r r function mode exponent default value 0 0 0 1 0 1 1 0
preliminary data sheet october 17, 2011 6a digital pico dlynx tm : non-isolated dc-dc power modules 3 ? 14.4vdc input; 0.45vdc to 5.5vdc output; 6a output current lineage power 26 table 6 (continued) hex code command brief description non- v olatile memory storage 22 vout_trim apply a fixed offset voltage to the output voltage command value format linear, two?s complement binary bit position 7 6 5 4 3 2 1 0 access r/w r/w r/w r/w r/w r/w r/w r/w function high byte default value 0 0 0 0 0 0 0 0 bit position 7 6 5 4 3 2 1 0 a ccess r/w r/w r/w r/w r/w r/w r/w r/w function low byte default value 0 0 0 0 0 0 0 0 yes 25 vout_margin_high sets the target voltage for margining the output high format linear, two?s complement binary bit position 7 6 5 4 3 2 1 0 access r r/w r/w r/w r/w r/w r/w r/w function high byte default value 0 0 0 0 0 1 0 1 bit position 7 6 5 4 3 2 1 0 access r/w r/w r/w r/w r/w r/w r/w r/w function low byte default value 0 1 0 0 0 1 1 1 yes 26 vout_margin_low sets the target voltage for margining the output low format linear, two?s complement binary bit position 7 6 5 4 3 2 1 0 a ccess r r/w r/w r/w r/w r/w r/w r/w function high byte default value 0 0 0 0 0 1 0 0 bit position 7 6 5 4 3 2 1 0 access r/w r/w r/w r/w r/w r/w r/w r/w function low byte default value 0 1 0 1 0 0 0 1 yes 29 vout_scale_loop sets the scaling of the output voltage ? equal to the feedback resistor divider ratio format linear, two?s complement binary bit position 7 6 5 4 3 2 1 0 a ccess r r r r r r r/w r/w function exponent mantissa default value 1 0 1 1 1 0 0 1 bit position 7 6 5 4 3 2 1 0 access r/w r/w r/w r/w r/w r/w r/w r/w function mantissa default value 0 0 0 0 0 0 0 0 yes 35 vin_on sets the value of input voltage at which the module turns on format linear, two?s complement binary bit position 7 6 5 4 3 2 1 0 a ccess r r r r r r r r function exponent mantissa default value 1 1 1 1 0 0 0 0 bit position 7 6 5 4 3 2 1 0 access r r/w r/w r/w r/w r/w r/w r/w function mantissa default value 0 0 0 0 1 0 1 1 yes
preliminary data sheet october 17, 2011 6a digital pico dlynx tm : non-isolated dc-dc power modules 3 ? 14.4vdc input; 0.45vdc to 5. 5vdc output; 6a output current lineage power 27 table 6 (continued) hex code command brief description non-volatile memory storage 36 vin_off sets the value of input voltage at which the module turns off format linear, two?s complement binary bit position 7 6 5 4 3 2 1 0 access r r r r r r r r function exponent mantissa default value 1 1 1 1 0 0 0 0 bit position 7 6 5 4 3 2 1 0 access r r/w r/w r/w r/w r/w r/w r/w function mantissa default value 0 0 0 0 1 0 1 0 yes 38 iout_cal_gain returns the value of the gain correction term used to correct the measured output current format linear, two?s complement binary bit position 7 6 5 4 3 2 1 0 access r r r r r r r r/w function exponent mantissa default value 1 0 0 0 1 0 0 v bit position 7 6 5 4 3 2 1 0 a ccess r/w r/w r/w r/w r/w r/w r/w r/w function mantissa default value v: variable based on factory calibration yes 39 iout_cal_offset returns the value of the offset correction term used to correct the measured output current format linear, two?s complement binary bit position 7 6 5 4 3 2 1 0 access r r r r r r/w r r function exponent mantissa default value 1 1 1 0 0 v 0 0 bit position 7 6 5 4 3 2 1 0 access r r r/w r/w r/w r/w r/w r/w function mantissa default value 0 0 v: variable based on factory calibration yes 40 vout_ov_fault_limit sets the voltage level for an output overvoltage fault format linear, two?s complement binary bit position 7 6 5 4 3 2 1 0 access r r/w r/w r/w r/w r/w r/w r/w function high byte default value 0 0 0 0 0 1 0 1 bit position 7 6 5 4 3 2 1 0 access r/w r/w r/w r/w r/w r/w r/w r/w function low byte default value 0 0 0 0 1 0 1 0 yes 41 vout_ov_fault_response instructs the module on what action to take in response to a output overvoltage fault format unsigned binary bit position 7 6 5 4 3 2 1 0 access r/w r/w r/w r/w r/w r r r function rsp [1] rsp [0] rs[2] rs[1] rs[0] x x x default value 1 1 1 1 1 1 0 0 yes
preliminary data sheet october 17, 2011 6a digital pico dlynx tm : non-isolated dc-dc power modules 3 ? 14.4vdc input; 0.45vdc to 5.5vdc output; 6a output current lineage power 28 table 6 (continued) hex code command brief description non- v olatile memory storage 44 vout_uv_fault_limit sets the voltage level for an output undervoltage fault format linear, two?s complement binary bit position 7 6 5 4 3 2 1 0 a ccess r r/w r/w r/w r/w r/w r/w r/w function high byte default value 0 0 0 0 0 1 0 0 bit position 7 6 5 4 3 2 1 0 access r/w r/w r/w r/w r/w r/w r/w r/w function low byte default value 1 0 0 0 1 1 1 1 yes 45 vout_uv_fault_response instructs the module on what action to take in response to a output undervoltage fault format unsigned binary bit position 7 6 5 4 3 2 1 0 access r/w r/w r/w r/w r/w r r r function rsp [1] rsp [0] rs[2] rs[1] rs[0] x x x default value 0 0 0 0 0 1 0 0 yes 4a iout_oc_warn_limit sets the output overcurrent warning level in a format linear, two?s complement binary bit position 7 6 5 4 3 2 1 0 access r r r r r r r r function exponent mantissa default value 1 1 1 1 1 0 0 0 bit position 7 6 5 4 3 2 1 0 access r r r/w r/w r/w r/w r/w r/w function mantissa default value 0 0 tbd tbd tbd tbd tbd tbd yes 5e power_good_on sets the output voltage level at which the pgood pin is asserted high format linear, two?s complement binary bit position 7 6 5 4 3 2 1 0 access r r/w r/w r/w r/w r/w r/w r/w function high byte default value 0 0 0 0 0 1 0 0 bit position 7 6 5 4 3 2 1 0 a ccess r/w r/w r/w r/w r/w r/w r/w r/w function low byte default value 0 1 1 0 1 0 1 0 yes 5f power_good_off sets the output voltage level at which the pgood pin is de-asserted low format linear, two?s complement binary bit position 7 6 5 4 3 2 1 0 a ccess r r/w r/w r/w r/w r/w r/w r/w function high byte default value 0 0 0 0 0 1 0 0 bit position 7 6 5 4 3 2 1 0 access r/w r/w r/w r/w r/w r/w r/w r/w function low byte default value 0 1 0 1 0 0 1 0 yes
preliminary data sheet october 17, 2011 6a digital pico dlynx tm : non-isolated dc-dc power modules 3 ? 14.4vdc input; 0.45vdc to 5. 5vdc output; 6a output current lineage power 29 table 6 (continued) hex code command brief description non-volatile memory storage 61 ton_rise sets the rise time of the output voltage during startup format linear, two?s complement binary bit position 7 6 5 4 3 2 1 0 access r r r r r r r r/w function exponent mantissa default value 1 1 1 0 0 0 0 0 bit position 7 6 5 4 3 2 1 0 access r/w r/w r/w r/w r/w r/w r/w r/w function mantissa default value 0 0 1 0 1 0 1 0 yes 78 status_byte returns one byte of information with a summary of the most critical module faults format unsigned binary bit position 7 6 5 4 3 2 1 0 access r r r r r r r r flag x off vout _ov iout _oc vin_ uv temp cml othe r default value 0 0 0 0 0 0 0 0 79 status_word returns two bytes of information with a summary of the module?s fault/warning conditions format linear, two?s complement binary bit position 7 6 5 4 3 2 1 0 access r r r r r r r r flag vout iout _oc x x pgo od x x x default value 0 0 0 0 0 0 0 0 bit position 7 6 5 4 3 2 1 0 access r r r r r r r r flag x off vout _ov iout _oc vin_ uv temp cml othe r default value 0 0 0 0 0 0 0 0 7a status_vout returns one byte of information with the status of the module?s output voltage related faults format unsigned binary bit position 7 6 5 4 3 2 1 0 a ccess r r r r r r r r flag vout_ov x x vout_uv x x x x default value 0 0 0 0 0 0 0 0 7b status_iout returns one byte of information with the status of the module?s output current related faults format unsigned binary bit position 7 6 5 4 3 2 1 0 access r r r r r r r r flag iout_oc x x x iout_oc_warn x x x default value 0 0 0 0 0 0 0 0 7d status_temperature returns one byte of information with the status of the module?s temperature related faults format unsigned binary bit position 7 6 5 4 3 2 1 0 access r r r r r r r r flag ot_fault ot_warn x x x x x x default value 0 0 0 0 0 0 0 0
preliminary data sheet october 17, 2011 6a digital pico dlynx tm : non-isolated dc-dc power modules 3 ? 14.4vdc input; 0.45vdc to 5.5vdc output; 6a output current lineage power 30 table 6 (continued) hex code command brief description non- v olatile memory storage 7e status_cml returns one byte of information with the status of the module?s communication related faults format unsigned binary bit position 7 6 5 4 3 2 1 0 access r r r r r r r r flag invalid command invalid data pec fail x x x other comm fault x default value 0 0 0 0 0 0 0 0 88 read_vin returns the value of the input voltage applied to the module format linear, two?s complement binary bit position 7 6 5 4 3 2 1 0 a ccess r r r r r r r r function exponent mantissa default value 1 1 0 1 1 0 0 0 bit position 7 6 5 4 3 2 1 0 access r r r r r r r r function mantissa default value 0 0 0 0 0 0 0 0 8b read_vout returns the value of the output voltage of the module format linear, two?s complement binary bit position 7 6 5 4 3 2 1 0 a ccess r r r r r r r r function mantissa default value 0 0 0 0 0 0 0 0 bit position 7 6 5 4 3 2 1 0 access r r r r r r r r function mantissa default value 0 0 0 0 0 0 0 0 8c read_iout returns the value of the output current of the module format linear, two?s complement binary bit position 7 6 5 4 3 2 1 0 access r r r r r r r r function exponent mantissa default value 1 1 1 0 0 0 0 0 bit position 7 6 5 4 3 2 1 0 access r r r r r r r r function mantissa default value 0 0 0 0 0 0 0 0 98 pmbus_revision returns one byte indicating the module is compliant to pmbus spec. 1.1 (read only) format unsigned binary bit position 7 6 5 4 3 2 1 0 a ccess r r r r r r r r default value 0 0 0 1 0 0 0 1 yes a0 mfr_vin_min returns the minimum input voltage the module is specified to operate at (read only) format linear, two?s complement binary bit position 7 6 5 4 3 2 1 0 access r r r r r r r r function exponent mantissa default value 1 1 1 1 0 0 0 0 bit position 7 6 5 4 3 2 1 0 access r r r r r r r r function mantissa default value 0 0 0 0 1 1 0 0 yes
preliminary data sheet october 17, 2011 6a digital pico dlynx tm : non-isolated dc-dc power modules 3 ? 14.4vdc input; 0.45vdc to 5. 5vdc output; 6a output current lineage power 31 table 6 (continued) hex code command brief description non-volatile memory storage a4 mfr_vout_min returns the minimum output voltage possible from the module (read only) format linear, two?s complement binary bit position 7 6 5 4 3 2 1 0 access r r r r r r r r function exponent mantissa default value 0 0 0 0 0 0 1 0 bit position 7 6 5 4 3 2 1 0 access r r r r r r r r function mantissa default value 0 1 1 0 0 1 1 0 yes d0 mfr_specific_00 returns module name information (read only) format unsigned binary bit position 7 6 5 4 3 2 1 0 access r r r r r r r r function reserved default value 1 1 1 0 1 0 0 0 bit position 7 6 5 4 3 2 1 0 access r r r r r r r r function module name reserved default value 0 0 0 1 1 0 1 0 yes d4 vout_cal_offset applies an offset to the read_vout command results to calibrate out offset errors in module measurements of the output voltage (between -125mv and +124mv) format linear, two?s complement binary bit position 7 6 5 4 3 2 1 0 access r/w r r r r r r r function mantissa default value v 0 0 0 0 0 0 0 bit position 7 6 5 4 3 2 1 0 access r/w r/w r/w r/w r/w r/w r/w r/w function mantissa default value v v v v v v v v yes d5 vout_cal_gain applies a gain correction to the read_vout command results to calibrate out gain errors in module measurements of the output voltage (between -0.125 and 0.121) format linear, two?s complement binary bit position 7 6 5 4 3 2 1 0 access r r r r r r r r/w function exponent mantissa default value 1 1 0 0 0 0 0 v bit position 7 6 5 4 3 2 1 0 access r/w r/w r/w r/w r/w r/w r/w r/w function mantissa default value v v v v v v v v yes d6 vin_cal_offset applies an offset correction to the read_vin command results to calibrate out offset errors in module measurements of the input voltage (between -2v and +1.968v) format linear, two?s complement binary bit position 7 6 5 4 3 2 1 0 access r r r r r/w r r r/w function exponent mantissa default value 1 1 0 1 v 0 0 v bit position 7 6 5 4 3 2 1 0 access r r r/w r/w r/w r/w r/w r/w function mantissa default value 0 0 v v v v v v yes
preliminary data sheet october 17, 2011 6a digital pico dlynx tm : non-isolated dc-dc power modules 3 ? 14.4vdc input; 0.45vdc to 5.5vdc output; 6a output current lineage power 32 hex code command brief description non-volatile memory storage d7 vin_cal_gain applies a gain correction to the read_vin command results to calibrate out gain errors in module measurements of the input voltage (between -0.125 and 0.121) format linear, two?s complement binary bit position 7 6 5 4 3 2 1 0 access r r r r r/w r r r/w function exponent mantissa default value 1 1 0 0 v 0 0 v bit position 7 6 5 4 3 2 1 0 access r r r r/w r/w r/w r/w r/w function mantissa default value 0 0 0 v v v v v yes
preliminary data sheet october 17, 2011 6a digital pico dlynx tm : non-isolated dc-dc power modules 3 ? 14.4vdc input; 0.45vdc to 5. 5vdc output; 6a output current lineage power 33 thermal considerations power modules operate in a variety of thermal environments; however, sufficient cooling should always be provided to help ensure reliable operation. considerations include ambient temperature, airflow, module power dissipation, and the need for increased reliability. a reduction in the operating temperature of the module will result in an increase in reliability. the thermal data presented here is based on physical measurements taken in a wind tunnel. the test set-up is shown in figure 49. the preferred airflow direction for the module is in figure 50. a i r flow x power module w ind tunnel pwbs 12.7_ (0.50) 76.2_ (3.0) probe location for measuring airflow and ambient temperature 25.4_ (1.0) figure 49. thermal test setup. the thermal reference points, t ref used in the specifications are also shown in figure 50. for reliable operation the temperatures at these points should not exceed tbd. the output power of the module should not exceed the rated power of the module (vo,set x io,max). please refer to the application note ?thermal characterization process for open-frame board- mounted power modules? for a detailed discussion of thermal aspects including maximum device temperatures. figure 50. preferred airflow direction and location of hot-spot of the module (tref).
preliminary data sheet october 17, 2011 6a digital pico dlynx tm : non-isolated dc-dc power modules 3 ? 14.4vdc input; 0.45vdc to 5.5vdc output; 6a output current lineage power 34 example application circuit requirements: vin: 12v vout: 1.8v iout: 4.5a max., worst case load transient is from 3a to 4.5a ? vout: 1.5% of vout (27mv) for worst case load transient vin, ripple 1.5% of vin (180mv, p-p) ci1 decoupling cap - 1x0.01 f/16v ceramic capacitor (e.g. murata lll185r71e103ma01) ci2 1x22 f/16v ceramic capacitor (e.g. murata grm32er61c226ke20) ci3 47 f/16v bulk electrolytic co1 decoupling cap - 1x0.01 f/16v ceramic capacitor (e.g. murata lll185r71e103ma01) co2 1 x 47 f/6.3v ceramic capacitor (e.g. murata grm31cr60j476me19) co3 1 x 330 f/6.3v polymer (e.g. sanyo poscap) ctune 2200pf ceramic capacitor (can be 1206, 0805 or 0603 size) rtune 178 ohms smt resistor (can be 1206, 0805 or 0603 size) rtrim 10k smt resistor (can be 1206, 0805 or 0603 size, recommended tolerance of 0.1%) raddr0 data seq vs- raddr1 gnd vin+ ci3 co3 a ddr0 vout vs+ gnd trim ctune rtune rtrim vin co1 ci1 vout+ on/off seq smbalrt# module pgood a ddr1 sig_gnd sync ci2 co2
preliminary data sheet october 17, 2011 6a digital pico dlynx tm : non-isolated dc-dc power modules 3 ? 14.4vdc input; 0.45vdc to 5. 5vdc output; 6a output current mechanical outline dimensions are in millimeters and (inches). tolerances: x.x mm 0.5 mm (x.xx in. 0.02 in.) [unless otherwise indicated] x.xx mm 0.25 mm (x.xxx in 0.010 in.) pin function pin function 1 on/off 10 pgood 2 vin 11 sync 1 3 gnd 12 vs- 4 vout 13 sig. gnd 5 vs+ (sense) 14 smbalert 6 trim 15 data 7 gnd 16 addr0 8 clk 17 addr1 9 seq pin 7 1 if unused, connect to ground.
preliminary data sheet october 17, 2011 6a digital pico dlynx tm : non-isolated dc-dc power modules 3 ? 14.4vdc input; 0.45vdc to 5. 5vdc output; 6a output current lineage power 36 recommended pad layout dimensions are in millimeters and (inches). tolerances: x.x mm 0.5 mm (x.xx in. 0.02 in.) [unless otherwise indicated] x.xx mm 0.25 mm (x.xxx in 0.010 in.) 2 if unused, connect to ground pin function pin function 1 on/off 10 pgood 2 vin 11 sync 2 3 gnd 12 vs- 4 vout 13 sig_gnd 5 vs+ (sense) 14 smbalert 6 trim 15 data 7 gnd 16 addr0 8 clk 17 addr1 9 seq 7
preliminary data sheet october 17, 2011 6a digital pico dlynx tm : non-isolated dc-dc power modules 3 ? 14.4vdc input; 0.45vdc to 5. 5vdc output; 6a output current lineage power 37 packaging details the 12v digital pico dlynx tm 6a modules are supplied in tape & reel as standard. modules are shipped in quantities of 200 modules per reel. all dimensions are in millimeters and (in inches). reel dimensions: outside dimensions: 330.2 mm (13.00) inside dimensions: 177.8 mm (7.00?) tape width: 24.00 mm (0.945?)
preliminary data sheet october 17, 2011 6a digital pico dlynx tm : non-isolated dc-dc power modules 3 ? 14.4vdc input; 0.45vdc to 5.5vdc output; 6a output current lineage power 38 surface mount information pick and place the 6a digital pico dlynx tm modules use an open frame construction and are designed for a fully automated assembly process. the modules are fitted with a label designed to provide a large surface area for pick and place operations. the label meets all the requirements for surface mount processing, as well as safety standards, and is able to withstand reflow temperatures of up to 300 o c. the label also carries product information such as product code, serial number and the location of manufacture. nozzle recommendations the module weight has been kept to a minimum by using open frame construction. variables such as nozzle size, tip style, vacuum pressure and placement speed should be considered to optimize this process. the minimum recommended inside nozzle diameter for reliable operation is 3mm. the maximum nozzle outer diameter, which will safely fit within the allowable component spacing, is 7 mm. bottom side / first side assembly this module is not recommended for assembly on the bottom side of a customer board. if such an assembly is attempted, components may fall off the module during the second reflow process. lead free soldering the 12vdigital pico dlynx tm 6a modules are lead-free (pb-free) and rohs compliant and are both forward and backward compatible in a pb-free and a snpb soldering process. failure to observe the instructions below may result in the failure of or cause damage to the modules and can adversely affect long-term reliability. pb-free reflow profile power systems will comply with j-std-020 rev. c (moisture/reflow sensitivity classification for nonhermetic solid state surface mount devices) for both pb-free solder profiles and msl classification procedures. this standard provides a recommended forced-air-convection reflow profile based on the volume and thickness of the package (table 5-2). the suggested pb-free solder paste is sn/ag/cu (sac). the recommended linear reflow profile using sn/ag/cu solder is shown in fig. 51. soldering outside of the recommended profile requires testing to verify results and performance. it is recommended that the pad layout include a test pad where the output pin is in the ground plane. the thermocouple should be attached to this test pad since this will be the coolest solder joints. the temperature of this point should be: maximum peak temperature is 260 c. minimum temperature is 235 c. dwell time above 217 c: 60 seconds minimum dwell time above 235 c: 5 to 15 second msl rating the 6a digital pico dlynx tm modules have a msl rating of 2. storage and handling the recommended storage environment and handling procedures for moisture-sensitive surface mount packages is detailed in j-std-033 rev. b (handling, packing, shipping and use of moisture/reflow sensitive surface mount devices). moisture barrier bags (mbb) with desiccant are required for msl ratings of 2 or greater. these sealed packages should not be broken until time of use. once the original package is broken, the floor life of the product at conditions of 30c and 60% relative humidity varies according to the msl rating (see j-std-033a). the shelf life for dry packed smt packages will be a minimum of 12 months from the bag seal date, when stored at the following conditions: < 40 c, < 90% relative humidity. figure 51. recommended linear reflow profile using sn/ag/cu solder. post solder cleaning and drying considerations post solder cleaning is usually the final circuit-board assembly process prior to electrical board testing. the result of inadequate cleaning and drying can affect both the reliability of a power module and the testability of the finished circuit-board assembly. for guidance on appropriate soldering, cleaning and drying procedures, refer to board mounted power modules: soldering and cleaning application note (an04-001).
preliminary data sheet october 17, 2011 6a digital pico dlynx tm : non-isolated dc-dc power modules 3 ? 14.4vdc input; 0.45vdc to 5. 5vdc output; 6a output current lineage power 39 document no: ds11-008 ver. 0.33 pdf name: pdt006a0x.pdf ordering information please contact your lineage power sales representative for pricing, availability and optional features. table 7. device codes device code input voltage range output voltage output current on/off logic sequencing comcodes PDT006A0X3-SRZ 3 ? 14.4vdc 0.45 ? 5.5vdc 6a negative yes cc109159604 pdt006a0x43-srz 3 ? 14.4vdc 0.45 ? 5. 5vdc 6a positive yes cc109159612 -z refers to rohs compliant parts table 8. coding scheme lineage power digital non-isolated dc-dc products use technology licensed from power-one, protected by us patents: us20040246754, us2004090219a1, us2004093533a1, us2004123164a1, us2004123167a1, us2004178780a1, us2004179382a1, us20050200344, us20050223252, us2005289373a1, u s20060061214, us2006015616a1, us20060174145, us20070226526, us20070234095, us20070240000, us20080052551, us20080072080, us20080186006, us6741 099, us6788036, us6936999, us6949916, us7000125, us7049798, us7068021, us7080265, us7249267, us7266709, us 7315156, us 7372682, us7373527, us7394445, us7456617, us7459892, us7493504, us7526660. outside the us the power-one licensed technology is protected by patents : au3287379aa, au3287437aa, au3290643aa, au3291357aa, cn10371856c, cn1045261oc, cn10458656c, cn10459360c, cn10465848c, cn11069332a, cn11124619a, cn11346682a, cn1685299a, cn1685459a, cn1685582a, cn1685583a, cn1698023a, cn1802619a, ep1561156a1, ep1561268a2, ep1576710a1, ep1576711a1, ep1604254a4, ep1604264a4, ep1714369a2, ep1745536a4, ep1769382a4, ep1899789a2, ep1984801a2, w004044718a1, w004045042a3, w004045042c1, w004062061 a1, w004062062a1, w004070780a3, w004084390a3, w0 04084391a3, w005079227a3, w005081771a3, w006019569a3, w02007001584a3, w02007094935a3 package identifier family sequencing option output current output voltage on/off logic remote sense options rohs compliance p d t 006a0 x 4 3 -sr -d z p=pico u=micro m=mega g=giga d=dlynx digital v = dlynx analog. t=with ez sequence x=without sequencing 6a x = programm able output 4 = positive no entry = negative 3 = remote sense s = surface mount r = tape & reel d = 105 c operating ambient, 40g operating shock as per mil std 810f z = rohs6 world wide headquarters lineage power corporation 601 shiloh road, plano, tx 75074, usa +1-888-lineage(546-3243) (outside u.s.a.: +1-972-244-watt(9288) ) www.lineagepower.com e-mail: techsupport1@lineagepower.com asia-pacific headquarters tel: +86.021.54279977*808 europe, middle-east and africa headquarters tel: +49.89.878067-280 india headquarters tel: +91.80.28411633 lineage power reserves the right to make changes to the product(s) or information contained herein without notice. no liability is assumed as a result of their use or a pplication. no rights under any patent accompany the sale of any such product(s) or information. lineage power dc-dc products are protected under various patents. information on these patents is available at www.lineagepower.com/patents . ? 2011 lineage power corporation, (plano, texas) all international rights reserved.

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