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zd-02137 rev. 2.1 21-jun-10 page 1 of 28 www.power-one.com ync12s20 dc-dc converter data sheet 9. 6 -14 vdc in p ut ; 0.7525-5.5 vdc pro g rammable @ 20 a applications ? intermediate bus architectures ? telecommunications ? data communications ? distributed power architectures ? servers, workstations benefits ? high efficiency ? no heat sink required ? reduces total solution board area ? tape and reel packing ? compatible with pick & place equipment ? minimizes part numbers in inventory the products: y-series features ? rohs lead-free solder and lead-solder-exempted products are available ? delivers up to 20 a (100 w) ? extended input range 9.6 v ? 14 v ? high efficiency (0.94 at 5 v output) ? surface-mount package ? industry-standard footprint and pinout ? small size and low profile: 1.30? x 0.53? x 0.314? (33.02 x 13.46 x 7.98 mm) ? weight: 0.22 oz [6.12 g] ? coplanarity less than 0.003?, maximum ? synchronous buck converter topology ? source and sink capable ? start-up into pre-biased output ? no minimum load required ? programmable output voltage via external resistor ? operating ambient temperature: -40 c to 85 c ? remote output sense ? remote on/off (positive or negative) ? fixed-frequency operation ? auto-reset output overcurrent protection ? auto-reset overtemperature protection ? high reliability, mtbf = tbd million hours ? all materials meet ul94, v-0 flammability rating ? ul 60950-1 recognition in the us & canada, and tuv sud certification per iec/en 60950-1 description power-one?s point-of-load converters are recommended for use with regulated bus converters in an intermediate bus architecture (iba). the ync12s20 non- isolated dc-dc converter delivers up to 20 a of output current in an industry-standard surface-mount package. operating from a 9.6 to 14 vdc input, the ync12s20 converter is an ideal choice for intermediat e bus architectures where point-of-load power delivery is generally a requirement. it provides a resistor-pro grammable regulated output voltage of 0.7525v to 5.5v. the y-series converters provide exceptional therma l performance, even in high temperature environments with minimal airflow. this is accomplished through the use of circuit, packaging and processing techniques to achieve ultra-high efficiency, excellent t hermal management and a very low body profile. the low body profile and the preclusion of heat sinks mi nimize impedance to system airflow, thus enhancing cooling for both upstream and downstream devices. the use of 100% automation for assembly, coupled with advanced power electronics and therma l design, results in a product with extremely high reliability.
zd-02137 rev. 2.1 21-jun-10 page 2 of 28 www.power-one.com ync12s20 dc-dc converter data sheet 9. 6 -14 vdc in p ut ; 0.7525-5.5 vdc pro g rammable @ 20 a electrical specifications conditions: t a =25oc, airflow=200 lfm (1 m/s), vin=12 vdc, v out = 0.7525 - 5.5v, unless otherwise specified. parameter notes min typ max units absolute maximum ratings input voltage continuous -0.3 15 vdc operating ambient temperature -40 85 c storage temperature -55 125 c feature characteristics switching frequency 300 khz output voltage programming range 1 by external resistor, see trim table 1 0.7525 5.5 vdc remote sense compensation 1 0.5 vdc turn-on delay time full resistive load with vin = (module enabled, then vin applied) fr om vin = vin(min) to vo=0.1* vo(nom) 3 ms with enable (vin = vin(nom) applied, then enabled) from enable to vo= 0.1*vo(nom) 3 ms rise time from 10% to 90%, full resistive load 4 ms on/off control (positive logic) 2 module off -5 0.8 vdc module on 2.4 v in vdc on/off control (negative logic) 2 module off 2.4 v in vdc module on -5 0.8 vdc note: 1. the output voltage should not exceed 5.5v (taking into a ccount both the programming and remote sense compensation). 2. converter is on if on/off pin is left open. 3. note that start-up time is the sum of turn-on delay time and rise time.
zd-02137 rev. 2.1 21-jun-10 page 3 of 28 www.power-one.com ync12s20 dc-dc converter data sheet 9. 6 -14 vdc in p ut ; 0.7525-5.5 vdc pro g rammable @ 20 a electrical specifications (continued) conditions: t a =25oc, airflow=200 lfm (1 m/s), vin=12 vdc, v out = 0.7525 - 5.5v, unless otherwise specified. parameter notes min typ max units input characteristics operating input voltage range 9.6 12 14 vdc input under voltage lockout turn-on threshold 9 vdc turn-off threshold 8.5 vdc maximum input current 20 adc out @ 9.6 vdc in v out = 5.0 vdc 11.1 adc v out = 3.3 vdc 7.6 adc v out = 2.5 vdc 5.9 adc v out = 2.0 vdc 4.8 adc v out = 1.8 vdc 4.4 adc v out = 1.5 vdc 3.8 adc v out = 1.2 vdc 3.1 adc v out = 1.0 vdc 2.7 adc v out = 0.7525 vdc 2.2 adc input stand-by current (module disabled) 5 ma input no load current (module enabled) v out = 5.0 vdc 80 ma v out = 3.3 vdc 62 ma v out = 2.5 vdc 52 ma v out = 2.0 vdc 47 ma v out = 1.8 vdc 45 ma v out = 1.5 vdc 43 ma v out = 1.2 vdc 41 ma v out = 1.0 vdc 39 ma v out = 0.7525 vdc 35 ma input reflected-ripple current - i s see fig. f for setup. (bw=20 mhz) tbd ma p-p input voltage ripple rejection 120 hz 72 db
zd-02137 rev. 2.1 21-jun-10 page 4 of 28 www.power-one.com ync12s20 dc-dc converter data sheet 9. 6 -14 vdc in p ut ; 0.7525-5.5 vdc pro g rammable @ 20 a electrical specifications (continued) conditions: t a =25 oc, airflow=200 lfm (1 m/s), vin=12 vdc, vout = 0.7525 ? 5.5 v, unless otherwise specified. parameter notes min typ max units output characteristics output voltage set point (no load) -1.5 vout +1.5 %vout output regulation over line full resistive load 2 mv over load from no load to full load 10 mv output voltage range (over all operating input voltage, resistive load and temperature conditions until end of life ) -2.5 +2.5 %vout output ripple and noise - 20mhz bandwidth (fig. f) over line, load and temperature peak-to-peak v out = 0.7525 vdc 10 15 mv p-p peak-to-peak v out = 5.0 vdc 35 50 mv p-p external load capacitance pl us full load (resistive) min esr > 1m ? 1,000 f min esr > 10 m ? 5,000 f output current range 0 20 a output current limit inception (i out ) 26 a output short-circuit current , rms value short=10 m ? , continuous 6 a dynamic response load current change from 10a ? 20a, di/dt = 5 a/ s co = 100 f ceramic + 470 f pos 140 mv settling time (v out < 10% peak deviation) 45 s unloading current change 20a ? 10a, di/dt = -5 a/ s co = 100 f ceramic + 470 f pos 140 mv settling time (v out < 10% peak deviation) 45 s efficiency full load (20a) v out = 5.0 vdc 94 % v out = 3.3 vdc 91 % v out = 2.5 vdc 89 % v out = 2.0 vdc 87 % v out = 1.8 vdc 86 % v out = 1.5 vdc 84 % v out = 1.2 vdc 81.5 % v out = 1.0 vdc 78 % v out = 0.7525 vdc 73.5 %
zd-02137 rev. 2.1 21-jun-10 page 5 of 28 www.power-one.com ync12s20 dc-dc converter data sheet 9. 6 -14 vdc in p ut ; 0.7525-5.5 vdc pro g rammable @ 20 a operation input and output impedance the y-series converter should be connected via a low impedance to the dc power source. in many applications, the inductance associated with the distribution from the power source to the input of the converter can affect the stability of the converter. it is recommended to use decoupling capacitors in order to ensure stability of the converter and reduce input ripple voltage. the converter has an internal input capacitance of 40 f with very low esr (ceramic capacitors). in a typical application, low - esr tantalum or pos capacitors will be sufficient to provide adequate ripple voltage filter ing at the input of the converter. however, very low esr ceramic capacitors 47 f-100 f are recommended at the input of the converter in order to minimize the input ripple voltage. they should be placed as close as possible to the input pins of the converter. ync12s20 has been designed for stable operation with or without external capacitance. low esr ceramic capacitors placed as close as possible to the load (min 47 f) are recommended for improved transient performance and lower output voltage ripple. it is important to keep low resistance and low inductance pcb traces for connecting load to the output pins of the converter in order to maintain good load regulation. on/off (pin 1) the on/off pin is used to turn the power converter on or off remotely via a system signal. there are two remote control options available, positive logic (standard option) and negative logic, and both are referenced to gnd. typical connections are shown in fig. a. the positive logic version turns the converter on when the on/off pin is at a logic high or left open, and turns the converter off when at a logic low or shorted to gnd. vin control input vin vin gnd on/off sense (top view) converter trim vout r* r* is for negative logic option only rload nex -c series tm fig. a: circuit configuration for on/off function. the negative logic version turns the converter on when the on/off pin is at logic low or left open, and turns the converter off when the on/off pin is at a logic high or connected to vin. on/off pin is internally pulled-up to vin for a positive logic version, and pulled-down for a negative logic version. a ttl or cmos logic gate, open collector (open drain) transistor can be used to drive on/off pin. when using open collector (open drain) transistor with a negative logic option, add a pull-up resistor (r*) of 75 k ? to vin as shown in fig. a; this device must be capable of: - sinking up to 0.2 ma at a low level voltage of ? 0.8 v - sourcing up to 0.25 ma at a high logic level of 2.3v ? 5v - sourcing up to 0.75 ma when connected to vin. remote sense (pin 2) the remote sense feature of the converter compensates for voltage drops occurring only between vout pin (pin 4) of the converter and the load. the sense (pin 2) pin should be connected at the load or at the point where regulation is required (see fig. b). there is no sense feature on the output gnd return pin, where a solid ground plane is recommended to provide low voltage drop. if remote sensing is not required, the sense pin must be connected to the vout pin (pin 4) to ensure the converter will regulate at the specified output voltage. if these connections are not made, the converter will deliver an output voltage that is slightly higher than the specified value.
zd-02137 rev. 2.1 21-jun-10 page 6 of 28 www.power-one.com ync12s20 dc-dc converter data sheet 9. 6 -14 vdc in p ut ; 0.7525-5.5 vdc pro g rammable @ 20 a vin vin rw rw rload vin gnd on/off (top view) converter trim sense vout nex -c series tm fig. b: remote sense circuit configuration. because the sense lead carries minimal current, large traces on the end-user board are not required. however, sense traces should be located close to a ground plane to minimize system noise and ensure optimum performance. when utilizing the remote sense feature, care must be taken not to exceed the maximum allowable output power ca pability of the converter, equal to the product of the nominal output voltage and the allowable output current for the given conditions. when using remote sense, the output voltage at the converter can be increased up to 0.5v above the nominal rating in order to maintain the required voltage across the load. therefore, the designer must, if necessary, decrease the maximum current (originally obtained from the derating curves) by the same percentage to ensure the converter?s actual output power remains at or below the maximum allowable output power. output voltage programming (pin 3) the output voltage can be programmed from 0.7525v to 5.5v by connecti ng an external resistor between trim pin (pin 3) and gnd pin (pin 5); see fig. c. a trim resistor, r trim , for a desired output voltage can be calculated using the following equation: 1 0.7525) - (v 5 . 10 r req - o rim t ? ? [k ? ] where, ? trim r required value of trim resistor [k ? ] ? ? req o v desired (trimmed) output voltage [v] vin r trim rload converter vin gnd on/off (top view) trim vout sense nex -c series tm fig. c: configuration for programming output voltage. note that the tolerance of a trim resistor directly affects the output voltage tolerance. it is recommended to use standard 1% or 0.5% resistors; for tighter tole rance, two resistors in parallel are recommended rather than one standard value from table 1. the ground pin of the trim resistor should be connected directly to the converter gnd pin (pin 5) with no voltage drop in between. table 1 provides the trim resistor values for popular output voltages. table 1: trim resistor value v 0-reg [v] r trim [k ? ] the closest standard value [k ? ] 0.7525 open 1.0 41.2 41.2 1.2 22.46 22.6 1.5 13.0 13.0 1.8 9.0 9.09 2.0 7.4 7.32 2.5 5.0 4.99 3.3 3.12 3.09 5.0 1.47 1.47 5.5 1.21 1.21 the output voltage can be also programmed by external voltage source. to make trimming less sensitive, a series external resistor rext is recommended between the trim pin and the programming voltage source. control voltage can be calculated by the formula: 15 0.7525) - )(v r 1 ( 7 . 0 v req - o ext ctrl ? ? ? [v] where,
zd-02137 rev. 2.1 21-jun-10 page 7 of 28 www.power-one.com ync12s20 dc-dc converter data sheet 9. 6 -14 vdc in p ut ; 0.7525-5.5 vdc pro g rammable @ 20 a ? ctrl v control voltage [v] ? ext r external resistor between trim pin and voltage source; the value can be chosen depending on the required output voltage range [k ? ]. control voltages with ? ext r 0 and ? ext r 15k are shown in table 2. table 2: control voltage [vdc] v 0-reg [v] v ctrl (r ext = 0) v ctrl (r ext = 15k) 0.7525 0.700 0.700 1.0 0.684 0.436 1.2 0.670 0.223 1.5 0.650 -0.097 1.8 0.630 -0.417 2.0 0.617 -0.631 2.5 0.584 -1.164 3.3 0.530 -2.017 5.0 0.417 -3.831 5.5 0.384 -4.364 protection features input undervoltage lockout input undervoltage lockout is standard with this converter. the converter will shut down when the input voltage drops below a pre-determined voltage; it will start automatically when vin returns to a specified range. the input voltage must be at least 9.6v (typically 9v) for the converter to turn on. once the converter has been turned on, it will shut off when the input voltage drops below typically 8.5v. output overcurrent protection (ocp) the converter is protect ed against overcurrent and short-circuit conditions. upon sensing an over- current condition (see fig. d), the converter will enter hiccup mode. once the overload or short circuit condition is removed, vout will return to nominal value. fig. d: output short circuit current (10 a/div) (r load = 10 mohm) for vout = 5.0 v time scale: 1 ms/div.; bottom trace: zoomed current with time scale 0.1 ms/div. overtemperature protection (otp) the converter will shut down under an overtemperature condition to protect itself from overheating caused by operation outside the thermal derating curves, or operation in abnormal conditions such as system fan failure. after the converter has cooled to a safe operating temperature, it will aut omatically restart. safety requirements the converter meets north american and international safety regulatory requirements per ul60950 and en60950. the maximum dc voltage between any two pins is vin under all operating conditions. therefore, the unit has elv (extra low voltage) output; it meets selv requirements under the condition that all input voltages are elv. the converter is not internally fused. to comply with safety agencies requirements, a recognized fuse with a maximum rating of 20 amps must be used in series with the input line.
zd-02137 rev. 2.1 21-jun-10 page 8 of 28 www.power-one.com ync12s20 dc-dc converter data sheet 9. 6 -14 vdc in p ut ; 0.7525-5.5 vdc pro g rammable @ 20 a characterization general information the converter has been characterized for many operational aspects, to include thermal derating (maximum load current as a function of ambient temperature and airflow) for vertical and horizontal mounting, efficiency, start-up and shutdown parameters, output ripple and noise, transient response to load step-change, overload, and short circuit. the figures are numbered as fig. x.y, where x indicates the different output voltages, and y associates with specific pl ots (y = 1 for the vertical thermal derating, ?). for example, fig. x.1 will refer to the vertical ther mal derating for all the output voltages in general. the following pages contain specific plots or waveforms associated with the converter. additional comments for specific data are provided below. test conditions all thermal and efficiency data presented were taken with the converter soldered to a test board, specifically a 0.060? thick printed wiring board (pwb) with four layers. the top and bottom layers were not metalized. the two inner layers, comprising two-ounce copper, were used to provide traces for connect ivity to the converter. the lack of metalization on the outer layers as well as the limited thermal connection ensured that heat transfer from the converter to the pwb was minimized. this provides a worst-case but consistent scenario for thermal derating purposes. all measurements requiring airflow were made in vertical and horizontal wind tunnel facilities using infrared (ir) thermography and thermocouples for thermometry. ensuring components on the converter do not exceed their ratings is important to maintaining high reliability. if one anticipates operating the converter at or close to the maximum loads specified in the derating curves, it is prudent to check actual operating temperatures in the application. thermographic imaging is preferable; if this capability is not available, then thermocouples may be used. power-one recommends the use of awg #40 gauge thermocouples to ensure measurement accuracy. careful routing of the thermocouple leads will further minimize measurement error. refer to fig. e for optimum measuring thermocouple location. thermal derating load current vs. ambient temperature and airflow rates are given in figs. x.1 for maximum temperature of 120 c. ambient temperature was varied between 25 c and 85 c, with airflow rates from 30 to 500 lfm (0.15m/s to 2.5 m/s), and vertical converter mounting. the airflow during the testing is parallel to the short axis of the converter, going from pin 1 and pin 6 to pins 2 ? 5. for each set of conditions, the maximum load current was defined as the lowest of: (i) the output current at which either any mosfet temperature did not exceed a maximum specified temperature (120c) as indicated by the thermographic image, or (ii) the maximum current rating of the converter (20 a) during normal operation, derating curves with maximum fet temperature less than or equal to 120 c should not be exceeded. temperature on the pcb at the thermocouple location shown in fig. e should not exceed 120 c in order to operate inside the derating curves. fig. e: location of the thermocoup le for thermal testing. efficiency figure x.2 shows the efficiency vs. load current plot for ambient temperature of 25 oc, airflow rate of 200 lfm (1 m/s) and input voltages of 9.6 v, 12 v, and 14 v.
zd-02137 rev. 2.1 21-jun-10 page 9 of 28 www.power-one.com ync12s20 dc-dc converter data sheet 9. 6 -14 vdc in p ut ; 0.7525-5.5 vdc pro g rammable @ 20 a power dissipation fig. x.3 shows the power dissipation vs. load current plot for ta = 25 oc, airflow rate of 200 lfm (1 m/s) with vertical mounting and input voltages of 9.6 v, 12 v, and 14 v. ripple and noise the output voltage ripple waveform is measured at full rated load current. note that all output voltage waveforms are measured across a 1 ? f ceramic capacitor. the output voltage ripple and input reflected ripple current waveforms are obtained using the test setup shown in fig. f. i s vout v source 1 ? f ceramic capacitor 1 ? h source inductance dc/dc converter 4x47 ? f ceramic capacitor 100 ? f ceramic capacitor c o c in nex -c series tm fig. f: test setup for measuring input reflected ripple currents, i s and output voltage ripple.
zd-02137 rev. 2.1 21-jun-10 page 10 of 28 www.power-one.com ync12s20 dc-dc converter data sheet 9. 6 -14 vdc in p ut ; 0.7525-5.5 vdc pro g rammable @ 20 a ambient temperature [c] 20 30 40 50 60 70 80 90 load current [adc] 0 5 10 15 20 25 500 lfm (2.5 m/s) 400 lfm (2.0 m/s) 300 lfm (1.5 m/s) 200 lfm (1.0 m/s) 100 lfm (0.5 m/s) 30 lfm (0.15 m/s) fig. 5.0v.1: available load current vs. ambient temperature and airflow rates for vout = 5.0 v converter mounted vertically with vin = 12 v, and maximum mosfet temperature ? 120 ? c. load current [adc] 0 4 8 12162024 efficiency 0.75 0.80 0.85 0.90 0.95 1.00 14 v 12 v 9.6 v fig. 5.0v.2: efficiency vs. load current and input voltage for vout = 5.0 v c onverter mounted vertically with air flowing at a rate of 200 lfm (1 m/s) and ta = 25 ? c. load current [adc] 0 4 8 12162024 power dissipation [w] 0 2 4 6 8 10 14 v 12 v 9.6 v fig. 5.0v.3: power loss vs. load current and input voltage for vout = 5.0 v c onverter mounted vertically with air flowing at a rate of 200 lfm (1 m/s) and ta = 25 ? c.
zd-02137 rev. 2.1 21-jun-10 page 11 of 28 www.power-one.com ync12s20 dc-dc converter data sheet 9. 6 -14 vdc in p ut ; 0.7525-5.5 vdc pro g rammable @ 20 a fig. 5.0v.4: turn-on transient for vout = 5.0 v with application of vin at full rated load current (resistive) and 100 f external capacitance at vin = 12 v. top trace: vin (10 v/div.); bottom trace: output voltage (1 v/div.); time scale: 2 ms/div. fig. 5.0v.6: output voltage response for vout = 5.0 v to positive load current step change from 10 a to 20 a with slew rate of 5 a/ s at vin = 12 v. top trace: output voltage (200 mv/div.); bottom trace: load current (5 a/div.). co = 100 f ceramic. time scale: 20 s/div. fig. 5.0v.5: output voltage ripple (20 mv/div.) at full rated load current into a resistive load with external capacitance 100 f ceramic + 1 f ceramic and vin = 12 v for vout = 5.0 v. time scale: 2 s/div. fig. 5.0v.7: output voltage response for vout = 5.0 v to negative load current step change from 20 a to 10 a with slew rate of -5 a/ s at vin = 12 v. top trace: output voltage (200 mv /div.); bottom trace: load current (5 a/div.). co = 100 f ceramic. time scale: 20 s/div.
zd-02137 rev. 2.1 21-jun-10 page 12 of 28 www.power-one.com ync12s20 dc-dc converter data sheet 9. 6 -14 vdc in p ut ; 0.7525-5.5 vdc pro g rammable @ 20 a ambient temperature [c] 20 30 40 50 60 70 80 90 load current [adc] 0 5 10 15 20 25 500 lfm (2.5 m/s) 400 lfm (2.0 m/s) 300 lfm (1.5 m/s) 200 lfm (1.0 m/s) 100 lfm (0.5 m/s) 30 lfm (0.15 m/s) fig. 3.3v.1: available load current vs. ambient temperature and airflow rates for vout = 3.3 v converter mounted vertically with vin = 12 v, and maximum mosfet temperature ? 120 ? c. load current [adc] 0 4 8 12162024 efficiency 0.75 0.80 0.85 0.90 0.95 1.00 14 v 12 v 9.6 v fig. 3.3v.2: efficiency vs. load current and input voltage for vout = 3.3 v c onverter mounted vertically with air flowing at a rate of 200 lfm (1 m/s) and ta = 25 ? c. load current [adc] 0 4 8 12162024 power dissipation [w] 0 2 4 6 8 10 14 v 12 v 9.6 v fig. 3.3v.3: power loss vs. load current and input voltage for vout = 3.3 v c onverter mounted vertically with air flowing at a rate of 200 lfm (1 m/s) and ta = 25 ? c.
zd-02137 rev. 2.1 21-jun-10 page 13 of 28 www.power-one.com ync12s20 dc-dc converter data sheet 9. 6 -14 vdc in p ut ; 0.7525-5.5 vdc pro g rammable @ 20 a fig. 3.3v.4: turn-on transient for vout = 3.3 v with application of vin at full rated load current (resistive) and 100 f external capacitance at vin = 12 v. top trace: vin (10 v/div.); bottom trace: output voltage (1 v/div.); time scale: 2 ms/div. fig. 3.3v.6: output voltage response for vout = 3.3 v to positive load current step change from 10 a to 20 a with slew rate of 5 a/ s at vin = 12 v. top trace: output voltage (200 mv/div.); bottom trace: load current (5 a/div.). co = 100 f ceramic. time scale: 20 s/div. fig. 3.3v.5: output voltage ripple (20 mv/div.) at full rated load current into a resistive load with external capacitance 100 f ceramic + 1 f ceramic and vin = 12 v for vout = 3.3 v. time scale: 2 s/div. fig. 3.3v.7: output voltage response for vout = 3.3 v to negative load current step change from 20 a to 10 a with slew rate of -5a/ s at vin = 12 v. top trace: output voltage (200 mv/div.); bottom trace: load current (5 a/div.). co = 100 f ceramic. time scale: 20 s/div.
zd-02137 rev. 2.1 21-jun-10 page 14 of 28 www.power-one.com ync12s20 dc-dc converter data sheet 9. 6 -14 vdc in p ut ; 0.7525-5.5 vdc pro g rammable @ 20 a ambient temperature [c] 20 30 40 50 60 70 80 90 load current [adc] 0 5 10 15 20 25 500 lfm (2.5 m/s) 400 lfm (2.0 m/s) 300 lfm (1.5 m/s) 200 lfm (1.0 m/s) 100 lfm (0.5 m/s) 30 lfm (0.15 m/s) fig. 2.5v.1: available load current vs. ambient temperature and airflow rates for vout = 2.5 v converter mounted vertically with vin = 12 v, and maximum mosfet temperature ? 120 ? c. load current [adc] 0 5 10 15 20 25 efficiency 0.75 0.80 0.85 0.90 0.95 1.00 14 v 12 v 9.6 v fig. 2.5v.2: efficiency vs. load current and input voltage for vout = 2.5 v c onverter mounted vertically with air flowing at a rate of 200 lfm (1 m/s) and ta = 25 ? c. ? load current [adc] 0 4 8 12162024 power dissipation [w] 0 2 4 6 8 10 14 v 12 v 9.6 v fig. 2.5v.3: power loss vs. load current and input voltage for vout = 2.5 v converter mounted vertically with air flowing at a rate of 200 lfm (1 m/s) and ta = 25 ? c.
zd-02137 rev. 2.1 21-jun-10 page 15 of 28 www.power-one.com ync12s20 dc-dc converter data sheet 9. 6 -14 vdc in p ut ; 0.7525-5.5 vdc pro g rammable @ 20 a fig. 2.5v.4: turn-on transient for vout = 2.5 v with application of vin at full rated load current (resistive) and 100 f external capacitance at vin = 12v. top trace: vin (10 v/di v.); bottom trace: output voltage (1 v/div.); time scale: 2 ms/div. fig. 2.5v.6: output voltage response for vout = 2.5 v to positive load current step change from 10 a to 20 a with slew rate of 5a/ s at vin = 12 v. top trace: output voltage (200 mv/div.); bottom trace: load current (5 a/div.). co = 100 f ceramic. time scale: 20 s/div. fig. 2.5v.5: output voltage ripple (20 mv/div.) at full rated load current into a resistive load with external capacitance 100 f ceramic + 1 f ceramic and vin = 12 v for vout = 2.5 v. time scale: 2 s/div. fig. 2.5v.7: output voltage response for vout = 2.5 v to negative load current step change from 20 a to 10 a with slew rate of -5a/ s at vin = 12 v. top trace: output voltage (200 mv/div.); bottom trace: load current (5 a/div.). co = 100 f ceramic. time scale: 20 s/div.
zd-02137 rev. 2.1 21-jun-10 page 16 of 28 www.power-one.com ync12s20 dc-dc converter data sheet 9. 6 -14 vdc in p ut ; 0.7525-5.5 vdc pro g rammable @ 20 a ambient temperature [c] 20 30 40 50 60 70 80 90 load current [adc] 0 5 10 15 20 25 500 lfm (2.5 m/s) 400 lfm (2.0 m/s) 300 lfm (1.5 m/s) 200 lfm (1.0 m/s) 100 lfm (0.5 m/s) 30 lfm (0.15 m/s) fig. 2.0v.1: available load current vs. ambient temperature and airflow rates for vout = 2.0 v converter mounted vertically with vin = 12 v, and maximum mosfet temperature ? 120 ? c. load current [adc] 0 4 8 12162024 efficiency 0.75 0.80 0.85 0.90 0.95 1.00 14 v 12 v 9.6 v fig. 2.0v.2: efficiency vs. load current and input voltage for vout = 2.0 v c onverter mounted vertically with air flowing at a rate of 200 lfm (1 m/s) and ta = 25 ? c. ? load current [adc] 0 4 8 12162024 power dissipation [w] 0 2 4 6 8 14 v 12 v 9.6 v fig. 2.0v.3: power loss vs. load current and input voltage for vout = 2.0 v converter mounted vertically with air flowing at a rate of 200 lfm (1 m/s) and ta = 25 ? c.
zd-02137 rev. 2.1 21-jun-10 page 17 of 28 www.power-one.com ync12s20 dc-dc converter data sheet 9. 6 -14 vdc in p ut ; 0.7525-5.5 vdc pro g rammable @ 20 a fig. 2.0v.4: turn-on transient for vout = 2.0 v with application of vin at full rated load current (resistive) and 100 f external capacitance at vin = 12 v. top trace: vin (10 v/div.); bottom trace: output voltage (1 v/div.); time scale: 2 ms/div. fig. 2.0v.6: output voltage response for vout = 2.0 v to positive load current step change from 10 a to 20 a with slew rate of 5 a/ s at vin = 12 v. top trace: output voltage (200 mv/div.); bottom trace: load current (5 a/div.). co = 100 f ceramic. time scale: 20 s/div. fig. 2.0v.5: output voltage ripple (20mv/div.) at full rated load current into a resistive load with external capacitance 100 f ceramic + 1 f ceramic and vin = 12 v for vout = 2.0 v. time scale: 2 s/div. fig. 2.0v.7: output voltage response for vout = 2.0 v to negative load current step change from 20 a to 10 a with slew rate of -5a/ s at vin = 12 v. top trace: output voltage (200 mv/div.); bottom trace: load current (5 a/div.). co = 100 f ceramic. time scale: 20 s/div.
zd-02137 rev. 2.1 21-jun-10 page 18 of 28 www.power-one.com ync12s20 dc-dc converter data sheet 9. 6 -14 vdc in p ut ; 0.7525-5.5 vdc pro g rammable @ 20 a ambient temperature [c] 20 30 40 50 60 70 80 90 load current [adc] 0 5 10 15 20 25 500 lfm (2.5 m/s) 400 lfm (2.0 m/s) 300 lfm (1.5 m/s) 200 lfm (1.0 m/s) 100 lfm (0.5 m/s) 30 lfm (0.15 m/s) fig. 1.8v.1: available load current vs. ambient temperature and airflow rates for vout = 1.8 v converter mounted vertically with vin = 12 v, and maximum mosfet temperature ? 120 ? c. load current [adc] 0 4 8 12 16 20 24 efficiency 0.70 0.75 0.80 0.85 0.90 0.95 14 v 12 v 9.6 v fig. 1.8v.2: efficiency vs. load current and input voltage for vout = 1.8 v c onverter mounted vertically with air flowing at a rate of 200 lfm (1 m/s) and ta = 25 ? c. load current [adc] 0 4 8 12162024 power dissipation [w] 0 2 4 6 8 14 v 12 v 9.6 v ? fig. 1.8v.3: power loss vs. load current and input voltage for vout = 1.8 v converter mounted vertically with air flowing at a rate of 200 lfm (1 m/s) and ta = 25 ? c.
zd-02137 rev. 2.1 21-jun-10 page 19 of 28 www.power-one.com ync12s20 dc-dc converter data sheet 9. 6 -14 vdc in p ut ; 0.7525-5.5 vdc pro g rammable @ 20 a fig. 1.8v.4: turn-on transient for vout = 1.8 v with application of vin at full rated load current (resistive) and 100 f external capacitance at vin = 12 v. top trace: vin (10 v/div.); bottom trace: output voltage (1 v/div.); time scale: 2 ms/div. fig. 1.8v.6: output voltage response for vout = 1.8 v to positive load current step change from 10 a to 20 a with slew rate of 5 a/ s at vin = 12 v. top trace: output voltage (200 mv/div.); bottom trace: load current (5 a/div.). co = 100 f ceramic. time scale: 20 s/div. fig. 1.8v.5: output voltage ripple (20 mv/div.) at full rated load current into a resistive load with external capacitance 100 f ceramic + 1 f ceramic and vin = 12 v for vout = 1.8 v. time scale: 2 s/div. fig. 1.8v.7: output voltage response for vout = 1.8 v to negative load current step change from 20 a to 10 a with slew rate of -5 a/ s at vin = 12 v. top trace: output voltage (200 mv /div.); bottom trace: load current (5 a/div.). co = 100 f ceramic. time scale: 20 s/div.
zd-02137 rev. 2.1 21-jun-10 page 20 of 28 www.power-one.com ync12s20 dc-dc converter data sheet 9. 6 -14 vdc in p ut ; 0.7525-5.5 vdc pro g rammable @ 20 a ambient temperature [c] 20 30 40 50 60 70 80 90 load current [adc] 0 5 10 15 20 25 500 lfm (2.5 m/s) 400 lfm (2.0 m/s) 300 lfm (1.5 m/s) 200 lfm (1.0 m/s) 100 lfm (0.5 m/s) 30 lfm (0.15 m/s) fig. 1.5v.1: available load current vs. ambient temperature and airflow rates for vout = 1.5 v converter mounted vertically with vin = 12 v, air flowing and maximum mosfet temperature ? 120 ? c. load current [adc] 0 4 8 12162024 efficiency 0.70 0.75 0.80 0.85 0.90 0.95 14 v 12 v 9.6 v fig. 1.5v.2: efficiency vs. load current and input voltage for vout = 1.5 v converter mounted vertically with air flowing at a rate of 200 lfm (1 m/s) and ta = 25 ? c. load current [adc] 0 4 8 12162024 power dissipation [w] 0 2 4 6 8 14 v 12 v 9.6 v fig. 1.5v.3: power loss vs. load current and input voltage for vout = 1.5v converter mounted vertically with air flowing at a rate of 200 lfm (1 m/s) and ta = 25 ? c.
zd-02137 rev. 2.1 21-jun-10 page 21 of 28 www.power-one.com ync12s20 dc-dc converter data sheet 9. 6 -14 vdc in p ut ; 0.7525-5.5 vdc pro g rammable @ 20 a fig. 1.5v.4: turn-on transient for vout = 1.5 v with application of vin at full rated load current (resistive) and 100 f external capacitance at vin = 12 v. top trace: vin (10 v/div.); bottom trace: output voltage (1 v/div.); time scale: 2 ms/div. fig. 1.5v.6: output voltage response for vout = 1.5 v to positive load current step change from 10 a to 20 a with slew rate of 5 a/ s at vin = 12 v. top trace: output voltage (200 mv/div.); bottom trace: load current (5 a/div.). co = 100 f ceramic. time scale: 20 s/div. fig. 1.5v.5: output voltage ripple (20 mv/div.) at full rated load current into a resistive load with external capacitance 100 f ceramic + 1 f ceramic and vin = 12 v for vout = 1.5 v. time scale: 2 s/div. fig. 1.5v.7: output voltage response for vout = 1.5 v to negative load current step change from 20 a to 10 a with slew rate of -5 a/ s at vin = 12 v. top trace: output voltage (200 mv /div.); bottom trace: load current (5 a/div.). co = 100 f ceramic. time scale: 20 s/div.
zd-02137 rev. 2.1 21-jun-10 page 22 of 28 www.power-one.com ync12s20 dc-dc converter data sheet 9. 6 -14 vdc in p ut ; 0.7525-5.5 vdc pro g rammable @ 20 a ambient temperature [c] 20 30 40 50 60 70 80 90 load current [adc] 0 5 10 15 20 25 500 lfm (2.5 m/s) 400 lfm (2.0 m/s) 300 lfm (1.5 m/s) 200 lfm (1.0 m/s) 100 lfm (0.5 m/s) 30 lfm (0.15 m/s) fig. 1.2v.1: available load current vs. ambient temperature and airflow rates for vout = 1.2 v converter mounted vertically with vin = 12 v, and maximum mosfet temperature ? 120 ? c. load current [adc] 0 4 8 12162024 efficiency 0.70 0.75 0.80 0.85 0.90 0.95 14 v 12 v 9.6 v fig. 1.2v.2: efficiency vs. load current and input voltage for vout = 1.2 v c onverter mounted vertically with air flowing at a rate of 200 lfm (1 m/s) and ta = 25 ? c. ? load current [adc] 0 4 8 12162024 power dissipation [w] 0 2 4 6 8 14 v 12 v 9.6 v fig. 1.2v.3: power loss vs. load current and input voltage for vout = 1.2 v converter mounted vertically with air flowing at a rate of 200 lfm (1 m/s) and ta = 25 ? c.
zd-02137 rev. 2.1 21-jun-10 page 23 of 28 www.power-one.com ync12s20 dc-dc converter data sheet 9. 6 -14 vdc in p ut ; 0.7525-5.5 vdc pro g rammable @ 20 a fig. 1.2v.4: turn-on transient for vout = 1.2 v with application of vin at full rated load current (resistive) and 100 f external capacitance at vin = 12 v. top trace: vin (10 v/div.); bottom trace: output voltage (1 v/div.); time scale: 2 ms/div. fig. 1.2v.6: output voltage response for vout = 1.2 v to positive load current step change from 10 a to 20 a with slew rate of 5 a/ s at vin = 12 v. top trace: output voltage (200 mv/div.); bottom trace: load current (5 a/div.). co = 100 f ceramic. time scale: 20 s/div. fig. 1.2v.5: output voltage ripple (20 mv/div.) at full rated load current into a resistive load with external capacitance 100 f ceramic + 1 f ceramic and vin = 12 v for vout = 1.2 v. time scale: 2 s/div. fig. 1.2v.7: output voltage response for vout = 1.2 v to negative load current step change from 20 a to 108 a with slew rate of -5 a/ s at vin = 12 v. top trace: output voltage (200 mv /div.); bottom trace: load current (5 a/div.). co = 100 f ceramic. time scale: 20 s/div.
zd-02137 rev. 2.1 21-jun-10 page 24 of 28 www.power-one.com ync12s20 dc-dc converter data sheet 9. 6 -14 vdc in p ut ; 0.7525-5.5 vdc pro g rammable @ 20 a ambient temperature [c] 20 30 40 50 60 70 80 90 load current [adc] 0 5 10 15 20 25 500 lfm (2.5 m/s) 400 lfm (2.0 m/s) 300 lfm (1.5 m/s) 200 lfm (1.0 m/s) 100 lfm (0.5 m/s) 30 lfm (0.15 m/s) fig. 1.0v.1: available load current vs. ambient temperature and airflow rates for vout = 1.0 v converter mounted vertically with vin = 12 v, and maximum mosfet temperature ? 120 ? c. load current [adc] 0 4 8 12162024 efficiency 0.60 0.65 0.70 0.75 0.80 0.85 0.90 14 v 12 v 9.6 v fig. 1.0v.2: efficiency vs. load current and input voltage for vout = 1.0 v c onverter mounted vertically with air flowing at a rate of 200 lfm (1 m/s) and ta = 25 ? c. load current [adc] 0 4 8 12162024 power dissipation [w] 0 2 4 6 8 14 v 12 v 9.6 v fig. 1.0v.3: power loss vs. load current and input voltage for vout = 1.0 v converter mounted vertically with air flowing at a rate of 200 lfm (1 m/s) and ta = 25 ? c.
zd-02137 rev. 2.1 21-jun-10 page 25 of 28 www.power-one.com ync12s20 dc-dc converter data sheet 9. 6 -14 vdc in p ut ; 0.7525-5.5 vdc pro g rammable @ 20 a fig. 1.0v.4: turn-on transient for vout = 1.0 v with application of vin at full rated load current (resistive) and 100 f external capacitance at vin = 12 v. top trace: vin (10 v/div.); bottom trace: output voltage (1 v/div.); time scale: 2 ms/div. fig. 1.0v.6: output voltage response for vout = 1.0 v to positive load current step change from 10 a to 20 a with slew rate of 5a/ s at vin = 12 v. top trace: output voltage (200 mv/div.); bottom trace: load current (5 a/div.). co = 100 f ceramic. time scale: 20 s/div. fig. 1.0v.5: output voltage ripple (20 mv/div.) at full rated load current into a resistive load with external capacitance 100 f ceramic + 1 f ceramic and vin = 12 v for vout = 1.0 v. time scale: 2 s/div. fig. 1.0v.7: output voltage response for vout = 1.0 v to negative load current step change from 20 a to 10 a with slew rate of -5a/ s at vin = 12 v. top trace: output voltage (200 mv/div.); bottom trace: load current (5 a/div.). co = 100 f ceramic. time scale: 20 s/div.
zd-02137 rev. 2.1 21-jun-10 page 26 of 28 www.power-one.com ync12s20 dc-dc converter data sheet 9. 6 -14 vdc in p ut ; 0.7525-5.5 vdc pro g rammable @ 20 a ambient temperature [c] 20 30 40 50 60 70 80 90 load current [adc] 0 5 10 15 20 25 500 lfm (2.5 m/s) 400 lfm (2.0 m/s) 300 lfm (1.5 m/s) 200 lfm (1.0 m/s) 100 lfm (0.5 m/s) 30 lfm (0.15 m/s) fig. 0.7525v.1: available load current vs. ambient temperature and airflow rates for vout = 1.0 v converter mounted vertically with vin = 12 v, and maximum mosfet temperature ? 120 ? c. load current [adc] 0 4 8 12162024 efficiency 0.60 0.65 0.70 0.75 0.80 0.85 14 v 12 v 9.6 v fig. 0.7525v.2: efficiency vs. load current and input voltage for vout = 0.7525v converter mounted vertically with air flowing at a rate of 200 lfm (1 m/s) and ta = 25 ? c. load current [adc] 0 4 8 12162024 power dissipation [w] 0 2 4 6 8 14 v 12 v 9.6 v fig. 0.7525v.3: power loss vs. load current and input voltage for vout = 0.7525v converter mounted vertically with air flowing at a rate of 200 lfm (1 m/s) and ta = 25 ? c.
zd-02137 rev. 2.1 21-jun-10 page 27 of 28 www.power-one.com ync12s20 dc-dc converter data sheet 9. 6 -14 vdc in p ut ; 0.7525-5.5 vdc pro g rammable @ 20 a fig. 0.7525v.4: turn-on transient for vout = 0.7525 v with application of vin at full rated load current (resistive) and 100 f external capacitance at vin = 12 v. top trace: vin (10 v/div.); bottom trace: output voltage (1 v/div.); time scale: 2 ms/div. fig. 0.7525v.6: output voltage response for vout = 0.7525 v to positive load cu rrent step change from 10 a to 20 a with slew rate of 5a/ s at vin = 12 v. top trace: output voltage (200 mv/div.); bottom trace: load current (5 a/div.). co = 100 f ceramic. time scale: 20 s/div. fig. 0.7525v.5: output voltage ripple (20 mv/div.) at full rated load current into a resistive load with external capacitance 100 f ceramic + 1 f ceramic and vin = 12 v for vout = 0.7525v. time scale: 2 s/div. fig. 0.7525v.7: output voltage response for vout = 0.7525 v to negative load current step change from 20 a to 10 a with slew rate of -5 a/ s at vin = 12 v. top trace: output voltage (200 mv/div.); bottom trace: load current (5 a/div.). co = 100 f ceramic. time scale: 20 s/div.
zd-02137 rev. 2.1 21-jun-10 page 28 of 28 www.power-one.com ync12s20 dc-dc converter data sheet 9. 6 -14 vdc in p ut ; 0.7525-5.5 vdc pro g rammable @ 20 a physical information top view (*) pin # 1 rotated 90 6 side view 3 4 5 1(*) 2 ync12s pinout (surface mount) converter part numbering/ordering information product series input voltage mounting scheme rated load current enable logic special features environmental ync 12 s 20 ? 0 s1 g y-series 9.6 ? 14 vdc s ? surface- mount 20 a (0.7525v to 5.5v) 0 ? standard (positive logic) d ? negative logic no suffix ? standard s1 ? capable of 25a for 300s during start-up no suffix ? rohs lead solder exemption compliant g ? rohs compliant for all six substances the example above describes p/n ync12s20-0s1g: 9.6v ? 14v inpu t, surface mount, 20a at 0.7525v to 5.5v output, standard enable logic, 25a for 300 s during start up capability, and rohs lead solder exemption compliant. please consult factor y regarding availability of a specific version. notes: nuclear and medical applications - power-o ne products are not designed, intended for use in, or authorized for use as critical components in life support systems, equipment used in hazardous env ironments, or nuclear control systems without the express wr itten consent of the respective divisional president of power-one, inc. technical revisions - the appearance of products, including safe ty agency certifications pict ured on labels, may change dependi ng on the date manufactured. specifications are subject to change without notice. pad/pin connections pad/pin # function 1 on/off 2 sense 3 trim 4 vout 5 gnd 6 vin ync12s platform notes ? all dimensions are in inches [mm] ? connector material: copper ? connector finish: gold over nickel ? converter weight: 0.22 oz [6.12 g] ? converter height: 0.327? max., 0.301? min. ? recommended surface-mount pads: min. 0.080? x 0.112? [2.03 x 2.84]

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