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bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 1 non-isolated dc/dc converters 6.0 vdc - 14 vdc input, 0.8 vdc - 2.75 vdc /30 a outputs jan. 11, 2010 bel power inc., a subsid iary of bel fuse inc. features ? wide input voltage range ? output voltage sequencing ? high efficiency ? over temperature protection ? monotonic start-up ? output over current protection ? remote on/off ? startup into pre-biased output ? remote sense ? tunable loop tm (a registered trademark of lineage powe r systems) to optimize dynamic output voltage response ? parallel operation with active current sharing ? class 1, category 2, non-isolated dc/dc converter (refer to ipc-9592) ? compliant to rohs eu directive 2002/95/ec ? ul * 60950 recognized, csa ? c22.2 no. 60950-00 certified ? vde ? 0805 (en60950-1 3 rd edition) licensed applications ? distributed power architectures ? servers and storage applications ? intermediate bus voltage applications ? networking equipment ? telecommunications equipment description the slin-30e1ax power modules are non-isolated dc-dc conver ters that can deliver up to 30 a of output current. these modules operate over a wide range of input voltage (v in = 6 vdc - 14 vdc) and provide a precisely regulated output voltage from 0.8 vdc to 2.75 vdc, progra mmable via an external resistor. features include remote on/off, adjustable output voltage, over curren t and over temperature pr otection, output voltage sequencing and paralleling with active current sharing. a new feature, the tunable loop tm , allows the user to optimize the dynamic response of the c onverter to match the load with re duced amount of output capacitance leading to savings on cost and pwb area. part selection output voltage input voltage max. output current typical efficiency model number active high model number active low 0.8 vdc - 2.75 vdc 6.0 vdc - 14 vdc 30 a 91.8% SLIN-30E1A0 slin-30e1al notes: add ?g? suffix at the end of the model number to indicate tray packaging. slin-30e1ax rohs com p liant rev. a
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 2 non-isolated dc/dc converters 6.0 vdc - 14 vdc input, 0.8 vdc - 2.75 vdc /30 a outputs jan. 11, 2010 bel power inc., a subsid iary of bel fuse inc. part number explanation s lin ? 30 e 1a 0 1 2 3 4 5 6 1---surface mount 4--- wide input voltage range (6.0-14v) 2---series code 5--- wide output volt age range (0.8-2.75v) 3---output current (30a) 6--- enable, active high, change ?0? to ?l? means active low absolute maximum ratings parameter min typ max unit notes continuous input voltage -0.3 - 15 v sequencing voltage -0.3 - 15 v operating ambient tem perature -40 - 85 c storage temperature -55 - 125 c note: stresses in excess of the absolute maximum rating s can cause permanent dama ge to the device. these are absolute stress ratings only, functional operati on of the device is not implied at these or any other conditions in excess of those given in the operatio ns sections of the data sheet. exposure to absolute maximum ratings for extended periods can adv ersely affect the device reliability. input specifications parameter min typ max unit notes operating input vo ltage 6.0 12 14 v input current (full load) - - 15.8 a v in = v in,min, vo=v o,set , i o = i o,max - 91 - ma vo=0.8v, v in =12v, i o =0, module enabled input current (no load) - 205 - ma vo=2.5v, v in =12v, i o =0, module enabled input stand-by current - 20 - ma v in = 12v, module disabled input reflected ripple current (pk-pk) - 100 - ma 5hz to 20mhz, 1 h source impedance; v in =6.0 to 14v , i o = i omax i 2 t inrush current transient - - 1 a 2 s input ripple rejection (120hz) - 50 - db turn-on threshold - 5.5 - v turn-off threshold - 5.0 - v caution: this converter is not internally fused. an input line fuse must be used in application. this power module can be used in a wide variety of appl ications, ranging from simple standalone operation to an integrated part of sophisticated power architecture. to preserve maximum flexibility, internal fusing is not included; however, to achieve maximum safety and system protection, always use an input line fuse. the safety agencies require a fast-acting fuse with a maximum rating of 20a. based on the information provided in this data sheet on inrush energy and maximum dc input curren t, the same type of fuse with a lower rating can be used. refer to the fuse manufacturer?s data sheet for further information. note: unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature conditions.
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 3 non-isolated dc/dc converters 6.0 vdc - 14 vdc input, 0.8 vdc - 2.75 vdc /30 a outputs jan. 11, 2010 bel power inc., a subsid iary of bel fuse inc. output specifications parameter min typ max unit notes output voltage set point -1 .5 - +1.5 %vo,set v in =v in,nom , i o =i o, nom output voltage -3.0 - +3.0 %vo,set over all operating input voltage, resistive load, and temperature conditio ns until end of life adjustment range 0.8 - 2.75 v selected by an external resistor remote sense range - - 0.5 v load regulation - - 10 mv i o =i o, min to i o, max line regulation - - 10 mv v in =v in, min to v in, max temperature regulation (-40c to 85c) - 0.5 1 %vo,set t ref =t a, min to t a, max ripple and noise (pk-pk) - - 50 mv 5hz to 20mhz bw, v in =v in, nom and i o =i o, min to i o, max , co = 0.1 f // 47 f ceramic capacitors output current range 0 - 30 a output dc current limit - 140 - %io,max hiccup mode output short-circuit current - 3.5 - a vo 250mv, hiccup mode output capacitance esr 1 m ? esr 0.15 m ? esr 10 m ? 0 0 0 - - - 200 1000 10000 uf uf uf without the tunable loop tm with the tunable loop tm with the tunable loop tm - 2.5 5 ms case 1: on/off input is enabled and then input power is applied (delay from instant at which v in = v in, min until vo =10% of vo, set) turn-on delay time - 2.5 5 ms 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 vo =10% of vo, set) output voltage rise time 2 - 10 ms time for vo to rise from 10% of vo, set to 90% of vo, set output voltage overshoot - - 3 %vo,set v in =v in, min to v in, max , i o =i o, max , with or without maximum external capacitance note: unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature conditions.
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 4 non-isolated dc/dc converters 6.0 vdc - 14 vdc input, 0.8 vdc - 2.75 vdc /30 a outputs jan. 11, 2010 bel power inc., a subsid iary of bel fuse inc. general specifications parameter min typ max unit notes efficiency vo=0.8v vo=1.2v vo=1.8v vo=2.5v - - - - 83.0 87.1 90.1 91.8 - - - - % % % % vin= 12vdc, ta=25c io=io, max , vo= vo,set switching frequency - 300 - khz over temperature protection - 125 - c sequencing slew rate capability - - 2 v/ms v in, min to v in, max ; i o, min to i o, max vseq < vo sequencing delay time 10 - - ms delay from v in, min to application of voltage on seq pin tracking accuracy power-up: 2v/ms power-down: 1v/ms - - 100 200 200 400 mv mv v in, min to v in, max ; i o, min - i o, max vseq < vo forced load share accuracy - 10 - %io number of units in parallel 5 weight - 7.04 - g mtbf 4,443,300 hours calculated mtbf (vin=12v, io=80% full lo ad, vo=2.5v, ta=40c, 200lfm) per telecordia method issue 2, method i case 3 dimensions inches (l w h) millimeters (l w h) 1.30 x 0.53 x 0.39 33.02 x 13.46 x 10.0 - note : unless otherwise indicated, specifications appl y over all operating input voltage, resistive load, and temperature conditions.
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 5 non-isolated dc/dc converters 6.0 vdc - 14 vdc input, 0.8 vdc - 2.75 vdc /30 a outputs jan. 11, 2010 bel power inc., a subsid iary of bel fuse inc. efficiency data 70 75 80 85 90 95 0 5 10 15 20 25 30 vin=14v vin=6v vin=12v 70 75 80 85 90 95 0 5 10 15 20 25 3 0 vin=14v vin=6v vin=12v efficiency, vo=0.8v vo=1.2v 70 75 80 85 90 95 0 5 10 15 20 25 30 vin=14v vin=6v vin=12v 70 75 80 85 90 95 100 0 5 10 15 20 25 30 vin=14v vin=6v vin=12v efficiency, (%) ) output current, i o (a) efficiency, vo=1.8v vo=2.5v
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 6 non-isolated dc/dc converters 6.0 vdc - 14 vdc input, 0.8 vdc - 2.75 vdc /30 a outputs jan. 11, 2010 bel power inc., a subsid iary of bel fuse inc. thermal derating curves 0 5 10 15 20 25 30 35 35 45 55 65 75 85 0.5m/s (100lfm) 1m/s (200lfm) nc 0 5 10 15 20 25 30 35 35 45 55 65 75 85 nc 0.5m/s (100lfm) 1m/s (200lfm) output current, io ( a ) ambient temperature, t a o c output current, io ( a ) ambient temperature, t a o c vo=0.8v vo=1.2v 0 5 10 15 20 25 30 35 35 45 55 65 75 85 0.5m/s (100lfm) 1m/s (200lfm) 1.5m/s (300lfm) 2m/s (400lfm) nc 0 5 10 15 20 25 30 35 35 45 55 65 75 85 nc 0.5m/s (100lfm) 1m/s (200lfm) 1.5m/s (300lfm) 2m/s (400lfm) output current, io (a) ambient temperature, t a o c output current, io ( a ) ambient temperature, t a o c vo=1.8v vo=2.5v
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 7 non-isolated dc/dc converters 6.0 vdc - 14 vdc input, 0.8 vdc - 2.75 vdc /30 a outputs jan. 11, 2010 bel power inc., a subsid iary of bel fuse inc. ripple and noise waveforms . output voltage v o ( v ) ( 20mv/div ) time, t (1 s/div) output voltage v o ( v ) ( 20mv/div ) time, t (1 s/div) vo=0.8v, vin=12v, io = io,max c out = 0.1 f // 47 f ceramic capacitors vo=1.2v, vin=12v, io = io,max c out = 0.1 f // 47 f ceramic capacitors output voltage v o (v) (20mv/div) time, t (1 s/div) output voltage v o ( v ) ( 20mv/div ) time, t (1 s/div) vo=1.8v, vin=12v, io = io,max c out = 0.1 f // 47 f ceramic capacitors vo=2.5v, vin=12v, io = io,max c out = 0.1 f // 47 f ceramic capacitors
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 8 non-isolated dc/dc converters 6.0 vdc - 14 vdc input, 0.8 vdc - 2.75 vdc /30 a outputs jan. 11, 2010 bel power inc., a subsid iary of bel fuse inc. transient response waveforms output current, output voltage i o ( a ) ( 5adiv ) v o ( v ) ( 200mv/div ) time, t (20 s /div) output current, output voltage i o ( a ) ( 5adiv ) v o ( v ) ( 200mv/div ) time, t (20 s /div) transient response to dynamic load change from 0% to 50% to 0%. vo=0.8v transient response to dynamic load change from 0% to 50% to 0%. vo=1.2v output current, output voltage i o (a) (5adiv) v o (v) (200mv/div) time, t (20 s /div) output current, output voltage i o ( a ) ( 5adiv ) v o ( v ) ( 200mv/div ) time, t (20 s /div) transient response to dynamic load change from 0% to 50% to 0%. vo=1.8v transient response to dynamic load change from 0% to 50% to 0%. vo=2.5v
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 9 non-isolated dc/dc converters 6.0 vdc - 14 vdc input, 0.8 vdc - 2.75 vdc /30 a outputs jan. 11, 2010 bel power inc., a subsid iary of bel fuse inc. startup time output voltage on/off voltage vo ( v ) ( 200mv/div ) v on/off ( v ) ( 5v/div ) time, t (2 ms/div) output voltage on/off voltage vo ( v ) ( 500mv/div ) v on/off ( v ) ( 5v/div ) time, t (2 ms/div) start-up using on/off voltage (i o = i o,max ), vo=0.8v start-up using on/off voltage (i o = i o,max ), vo=1.2v output voltage on/off voltage vo (v) (500mv/div) v on/off (v) (5v/div) time, t (2 ms/div) output voltage on/off voltage vo ( v ) 1v/div ) v on/off ( v ) ( 5v/div ) time, t (2 ms/div) start-up using on/off voltage (i o = i o,max ), vo=1.8v start-up using on/off voltage (i o = i o,max ), vo=2.5v
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 10 non-isolated dc/dc converters 6.0 vdc - 14 vdc input, 0.8 vdc - 2.75 vdc /30 a outputs jan. 11, 2010 bel power inc., a subsid iary of bel fuse inc. startup time (continued) output voltage input voltage vo ( v ) ( 200mv/div ) v in ( v ) ( 5v/div ) time, t (2 ms/div) output voltage input voltage vo ( v ) ( 500mv/div ) v in ( v ) ( 5v/div ) time, t (2 ms/div) start-up using input voltage (v in = 12v, i o = i o,max ), vo=0.8v start-up using input voltage (v in = 12v, i o = i o,max ), vo=1.2v output voltage input voltage vo(v) (500mv/div) v in (v) (5v/div) time, t (2 ms/div) output voltage input voltage vo ( v ) ( 1v/div ) v in ( v ) ( 5v/div ) time, t (2 ms/div) start-up using input voltage (v in = 12v, i o = i o,max ), vo=1.8v start-up using input voltage (v in = 12v, i o = i o,max ), vo=2.5v
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 11 non-isolated dc/dc converters 6.0 vdc - 14 vdc input, 0.8 vdc - 2.75 vdc /30 a outputs jan. 11, 2010 bel power inc., a subsid iary of bel fuse inc. test configurations input reflected ripple current test setup. to oscilloscope current probe l test 1 h battery c s 220 f e.s.r.<0.1 f v in (+) com note: measure input reflected ripple current with a simulated source inductance (l test ) of 1 h. capacitor c s offsets possible battery impedance. measure current as shown above. c in output ripple and noise test setup. note: all voltage measurements to be taken at the module terminals, as shown above. if sockets are used then kelvin connections are required at the module terminals to avoid measurement errors due to socket contact resistance. v o (+) com 1uf . resistive load scope copper strip ground plane 10uf output voltage and efficiency test setup. v o com v in (+) com r load r contact r distribution r contact r distribution r contact r contact r distribution r distribution v in v o note: all voltage measurements to be taken at the module terminals, as shown above. if sockets are used then kelvin connections are required at the module terminals to avoid measurement errors due to socket contact resistance. = v o . i o v in . i in x 100 % efficiency
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 12 non-isolated dc/dc converters 6.0 vdc - 14 vdc input, 0.8 vdc - 2.75 vdc /30 a outputs jan. 11, 2010 bel power inc., a subsid iary of bel fuse inc. input filtering the slin-30e1ax module should be connected to a low ac -impedance source. a highly inductive source can affect the stability of the module. an input capacitor mu st be placed directly adjacen t to the input pin of the module, to minimize input ripple voltage and ensure module stability. to minimize input voltage ripple, low-esr polymer and ce ramic capacitors are recommended at the input of the module. the figure below shows the input ripple voltage fo r various output voltages at 30a of load current with 1x22f, 2x22 f or 2x47 f cerami c capacitors and an input of 12v. input ripple voltage (mvp-p) 0 50 100 150 200 250 300 350 400 0.5 1 1.5 2 2.5 1x22uf 2x22uf 2x47uf output voltage (vdc) output filtering the slin-30e1ax modules are designed for low output ripple voltage and will meet the maximum output ripple specification with no external capacitors. however, additional output filtering ma y 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 resp onse to a step load change, additional capacitance at the output can be used. low esr ceramic and polymer are recommended to improve the dynamic response of the module. for stable operation of the module, limit the capacitance to less than the maximum output capacitance as specified in the electrical specificat ion table. optimal performance of the module can be achieved by using the tunable loop feature described later in this data sheet. 0 20 40 60 80 100 0.511.522.5 output voltage(volts) ripple(mvp-p) 1x10uf external cap 1x47uf external cap 2x47uf external cap 4x47uf external cap
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 13 non-isolated dc/dc converters 6.0 vdc - 14 vdc input, 0.8 vdc - 2.75 vdc /30 a outputs jan. 11, 2010 bel power inc., a subsid iary of bel fuse inc. safety considerations for safety agency approval the power module must be inst alled in compliance with the spacing and separation requirements of the end-use safety agency standards, i.e., ul 60950-1, csa c22.2 no. 60950-1-03, and vde 0850:2001-12 (en60950-1) licensed. the slin-30e1ax was tested using a 30a, time delay fuse in the ungrounded input. for the converter output to be considered meeting the requir ements of safety extra-low voltage (selv), the input must meet selv requirements. the power module has ex tra-low voltage (elv) outputs when all inputs are elv. the input to these units is to be provided with a time- delay fuse with a maximum rating of 30a in the positive input lead. remote on/off parameter min typ max unit notes signal low (unit on) -0.3 - 1.2 v signal high (unit off) active low 3.0 - vin,max v the remote on/off pin open, unit off. the slin-30e1ax power modules feature an on/off pin for remote on/off operation. if not using the on/off pin, connect the pin to ground (the module will be on). the on/off signal (v on/off ) is referenced to ground. the circuit configuration for remote on/off operation of the module using the on/off pin is shown below. during a logic high on the on/off pin (transistor q1 is off), the module remains off. the external resistor r1 should be chosen to maintain 3.0v minimum on the on/o ff pin to ensure that the module is off when transistor q1 is in the off state. suitable values for r1 are 4.7k for input voltage of 12v and 3k for 5vin. during logic- low when q1 is turned on, the module is turned on. the on/off pin can also be used to synchronize the out put voltage start-up and shutdown of multiple modules in parallel. by connecting on/off pins of multiple modules , the output start-up can be synchronized (please refer to characterization curves). when on/off pins are connecte d together, all modules will s hutdown if any one of the modules gets disabled due to under voltage lockout or over temperature protection 100k q1 gnd pwm enable on/off vin+ on/off _ + i v module r1 on/off 1k 100k thermal sd remote on/off implementation using on/off
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 14 non-isolated dc/dc converters 6.0 vdc - 14 vdc input, 0.8 vdc - 2.75 vdc /30 a outputs jan. 11, 2010 bel power inc., a subsid iary of bel fuse inc. over current protection to provide protection in a fault (out put overload) condition, the unit is e quipped with internal current-limiting circuitry and can endure current limiting continuously. at t he 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. over temperature protection to provide protection in a fault condition, the unit is equipped with a thermal shutdown circuit. the unit will shutdown if the over temperature threshold of 125c is exceeded at the thermal reference point tref. the thermal shutdown is not intended as a guarantee that the unit will survive temperatur es beyond its rating. once the unit goes into thermal shutdown it will then wait to cool before attempting to restart. input under-voltage lockout at input voltages below the input under voltage lockout limit, the module operat ion is disabled. the module will begin to operate at an input voltage above the under voltage lockout turn-on threshold. output voltage programming the output voltage of the slin-30e1ax can be programmed to any voltage from 0.8dc to 2.75vdc by connecting a resistor (shown as r trim in the figure below) between trim and gnd pins of the module. without an external resistor between trim and gnd pins, the output of the module will be 0.8vdc. to calculate the value of the trim resistor, r trim for a desired output voltage, use the following equation: ? ? ? ? ? ? ? = 8 . 0 8000 vo r trim rtrim is the external resistor in ? vo is the desired output voltage by using a 0.5% tolerance trim resistor with a tc of 100ppm, a set point tolerance of 1.5% can be achieved as specified in the electrical specification. table 1 provides rtrim values required for some common output voltages. table 1 v o, set (v) rtrim ( k ? ) 0.8 open 1.0 40 1.2 20 1.5 11.429 1.8 8 2.5 4.706 circuit configuration to program output voltage using an external resistor v o (+) trim gnd r tr im load v in (+) on/off s ens e
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 15 non-isolated dc/dc converters 6.0 vdc - 14 vdc input, 0.8 vdc - 2.75 vdc /30 a outputs jan. 11, 2010 bel power inc., a subsid iary of bel fuse inc. remote sense the slin-30e1ax power modules have a remote sense featur e to minimize the effects of distribution losses by regulating the voltage at the sense pin. the voltage between the sense pin and vout pin must not exceed 0.5v. note that the output voltage of the module cannot exceed the specified maximum value. this includes the voltage drop between the sense and vout pins. when t he remote sense feature is not being used, connect the sense pin to the vout pin . voltage margining output voltage margining can be implemented in the slin-30e1ax modules 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. t he figure below shows the circui t configuration for output voltage margining. vo module gnd trim q1 rtrim rmargin-up q2 rmargin-down circuit configuration for margining output voltage monotonic start-up and shutdown the slin-30e1ax modules have monotonic start-up and s hutdown behavior for any combination of rated input voltage, output current and operating temperature range. startup into pre-biased output the slin-30e1ax modules can start into a prebiased output as long as the prebias voltage is 0.5v less than the set output voltage. note that prebias operation is not supported when output voltage sequencing is used .
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 16 non-isolated dc/dc converters 6.0 vdc - 14 vdc input, 0.8 vdc - 2.75 vdc /30 a outputs jan. 11, 2010 bel power inc., a subsid iary of bel fuse inc. output voltage sequencing the slin-30e1ax modules include a sequencing feature t hat enables users to implemen t various types of output voltage sequencing in their applications. this is acco mplished via an additional sequencing pin. when not using the sequencing feature, either tie the seq pin to vin or leave it unconnected. when an analog voltage is applied to the seq pin, the out put voltage tracks this voltage until the output reaches the set-point voltage. the final value of the seq volt age must be set higher than the set-point voltage of the module. the output voltage follows the voltage on the seq pin 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. for proper voltage sequencing, first, input voltage is applie d to the module. the on/off pin of the module is left unconnected (or tied to gnd for negative logic modules or tied to vin for positive logic modules) so that the module is on by default. after applying input voltage to the module, a minimum 10msec delay is required before applying voltage on the seq pin. this delay gives the module enough time to complete its internal power-up soft- start cycle. during the delay time, the seq pin should be held close to ground (nominally 50mv 20 mv). this is required to keep the internal op-amp out of saturation t hus preventing output overshoot during the start of the sequencing ramp. by selecting resistor r1 according to the following equation: 05 . 0 24950 1 ? = in v r ohms the voltage at the sequencing pin will be 50mv when the sequencing signal is at zero. r1 gnd vin+ seq + - out 10k 499k module circuit showing connection of the sequencing signal to the seq pin after the 10msec delay, an analog voltage is applied to the seq pin and the output voltage of the module will track this voltage on a one-to-one volt basis until the out put reaches the set-point voltage. to initiate simultaneous shutdown of the modules, the seq pin vo ltage is lowered in a controlled manner. the output voltage of the modules tracks the volt ages 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. when using the sequencing feature to control start-up of the module, pre-bias i mmunity during start-up is disabled. the pre-bias immunity f eature of the module relies on the module being in the diode-mode during start- up. when using the sequencing feature, modules goes thro ugh an internal set-up time of 10msec, and will be in synchronous rectification mode when the vo ltage at the seq pin is applied. this will result in the module sinking current if a pre-bias voltage is present at the output of the module. when pre-bias immunity during start-up is required, the sequencing feature must be disabled. for additional guidelines on using the sequencing feature please contact the bel power technical representatives for additional information.
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 17 non-isolated dc/dc converters 6.0 vdc - 14 vdc input, 0.8 vdc - 2.75 vdc /30 a outputs jan. 11, 2010 bel power inc., a subsid iary of bel fuse inc. active load sharing for additional power requirements, the slin-30e1ax power m odule is also available with a parallel option. up to five modules can be configured, in parallel, with active load sharing. good layout techniques should be observed when using mult iple units in parallel. to implement forced load sharing, the following connections should be made: ? the share pins of all units in parallel must be conne cted together. the path of these connections should be as direct as possible. ? all remote-sense pins should be connected to the po wer bus at the same point, i.e., connect all the sense(+) pins to the (+) side of the bus. close pr oximity and directness are necessary for good noise immunity. some special considerations apply for desig n of converters in parallel operation: ? when sizing the number of modules required for paralle l operation, take note of the fact that current sharing has some tolerance. in addition, under transient conditions such as a dynamic load change and during startup, all converter output currents will not be equal. to allow for such variation and avoid the likelihood of a converter shutting off due to a current overload, the total capacity of the paralleled system should be no more than 75% of the sum of the individual converters . as an example, for a syst em of four slin-30e1ax converters in parallel, the total current drawn shoul d be less that 75% of (4 x 30a) , i.e. less than 90a. ? all modules should be turned on and off together. this is so that all modules come up at the same time avoiding the problem of one converter sourcing current into the other leading to an over current trip condition. to ensure that all modules come up simultaneously, the on/ off pins of all paralleled converters should be tied together and the converters enabled and disabled using the on/off pin. the share bus is not designed for redundant operation and the system will be non-functional upon failure of one of the unit when multiple units are in parallel. in particula r, if one of the converters shuts down during operation, the other converters may also shut down due to their out puts hitting current limit. in such a situation, unless a coordinated restart is ensured, the sy stem may never properly restart since di fferent converters will try to restart at different times causing an overload condition and subsequent shutdown. this situation can be avoided by having an external output voltage monitor circuit that det ects a shutdown condition and forces all converters to shut down and restart together. tunable loop tm the slin-30e1ax modules have a new feature that optim izes 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 and to reduce output voltage deviations from the st eady-state value in the presence of dynamic load current changes. adding external capacitance however a ffects 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 vo ltage 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 sense and trim pins of the module. this r-c allows the user to externally adjust the voltage loop feedback compensation of the module.
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 18 non-isolated dc/dc converters 6.0 vdc - 14 vdc input, 0.8 vdc - 2.75 vdc /30 a outputs jan. 11, 2010 bel power inc., a subsid iary of bel fuse inc. tunable loop tm (continued) module vout sense trim gnd rtune ctune rtrim c o circuit diagram showing connection of r tune and c tune to tune the control loop of the module recommended values of r tune and c tune for different output capacitor combin ations are given in tables 2 and 3. table 2 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 2 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 15a to 30a step change (50% of full load), with an input voltage of 12v. table 2 .general recommended values of r tune and c tune for vin=12v and various external ceramic capacitor combinations. co 1x47 f 2x47 f 4x47 f 10x47 f 20x47 f r tune 560 390 390 220 220 c tune 270pf 470pf 820pf 2200pf 4700pf table 3 .recommended values of r tune and c tune to obtain transient deviation of 2% of vout for a 15a step load with vin=12v. vo 2.5v 1.8v 1.2v 0.8v co 3x47 f + 3x330 f polymer 3x47 f + 4x330 f polymer 7x330 f polymer 2x47 f+ 10x330 f polymer r tune 390 330 220 150 c tune 3900pf 6800pf 10nf 56nf v 50mv 36mv 24mv 16mv
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 19 non-isolated dc/dc converters 6.0 vdc - 14 vdc input, 0.8 vdc - 2.75 vdc /30 a outputs jan. 11, 2010 bel power inc., a subsid iary of bel fuse inc. thermal considerations power modules operate in a variety of thermal envir onments; 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 meas urements taken in a wind tunnel. the test set-up is shown below. 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) thermal test setup the thermal reference points, t ref used in the specifications is shown below. for reliable operation the temperatures at this point should not exceed 125 o c. the output power of the modul e should not exceed the rated power of the module (vo,set x io,max). preferred airflow direction and locati on of hot-spot of the module (tref). airflow direction q6 & l2 tref
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 20 non-isolated dc/dc converters 6.0 vdc - 14 vdc input, 0.8 vdc - 2.75 vdc /30 a outputs jan. 11, 2010 bel power inc., a subsid iary of bel fuse inc. example application circuit requirements: vin: 12v vout: 1.8v iout: 22.5a max., worst case load transient is from 15a to 22.5a vout: 1.5% of vout (27mv) for worst case load transient vin, ripple 1.5% of vin (50mv, p-p) ci1 2x22 f/16v ceramic capacitor (e.g. tdk c series) ci2 100 f/16v bulk electrolytic co1 3x47 f/6.3v ceramic capacitor (e.g. tdk c series, murata grm32er60j476me20) co2 330 f/4v polymer/poscap, low est (e.g. sanyo poscap 4tpe470mcl) ctune 15nf ceramic capacitor (can be 1206, 0805 or 0603 size) rtune 430 ohms smt resistor (can be 1206, 0805 or 0603 size) rtrim 8k smt resistor (can be 1206, 0805 or 0603 size, recommended tolerance of 0.1%)
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 21 non-isolated dc/dc converters 6.0 vdc - 14 vdc input, 0.8 vdc - 2.75 vdc /30 a outputs jan. 11, 2010 bel power inc., a subsid iary of bel fuse inc. mechanical outline pin no. function 1 on/off 2 v in 3 seq 4 gnd 5 v out 6 trim 7 sense 8 gnd 9 share 10 gnd co-planarity (max) : 0.102[0.004] top view side view bottom view
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 22 non-isolated dc/dc converters 6.0 vdc - 14 vdc input, 0.8 vdc - 2.75 vdc /30 a outputs jan. 11, 2010 bel power inc., a subsid iary of bel fuse inc. mechanical outline (continued) 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.) pin 8 pin 10
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 23 non-isolated dc/dc converters 6.0 vdc - 14 vdc input, 0.8 vdc - 2.75 vdc /30 a outputs jan. 11, 2010 bel power inc., a subsid iary of bel fuse inc. packaging details the slin-30e1ax modules are supplied in tape & reel as standard. all dimensions are in m illimeters and (in inches). reel dimensions: outside dimensions: 330.2 mm (13.00??) inside dimensions: 177.8 mm (7.00?) tape width: 44.00 mm (1.73?)
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 24 non-isolated dc/dc converters 6.0 vdc - 14 vdc input, 0.8 vdc - 2.75 vdc /30 a outputs jan. 11, 2010 bel power inc., a subsid iary of bel fuse inc. surface mount information pick and place the slin-30e1ax modules use an open frame constructi on 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 surf ace 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 part number and serial number. pick and place location. nozzle recommendations the module weight has been kept to a minimum by us ing open frame construction. even so, these modules have a relatively large mass when compared to conventional smt components. variables such as nozzle size, tip style, vacuum pressure and pick & 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 5 mm max. tin lead soldering the slin-30e1ax power modules are lead free modules and can be soldered either in a lead-free solder process or in a conventional tin/lead (sn/pb) pr ocess. it is recommended that the customer review data sheets in order to customize the solder reflow profile for each applicat ion board assembly. the following instructions must be observed when soldering these units. failure to observe thes e instructions may result in the failure of or cause damage to the modules, and can adversely affect long-term reliability. in a conventional tin/lead (sn/pb) solder process pea k reflow temperatures are limited to less than 235 o c. typically, the eutectic solder melts at 183 o c, wets the land, and subsequentl y wicks the device connection. sufficient time must be allowed to fuse the plating on the connection to ensure a reliable solder joint. there are several types of smt reflow technologies currently used in the industry. these surface mount power modules can be reliably soldered using natural forced convection, ir (radiant infrared), or a combination of convection/ir. for reliable soldering the solder reflow profile should be established by accurately measuring the modules cp connector temperatures. lead free soldering the slin-30e1ax 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 instru ctions may result in the failure of or cause damage to the modules and can adversely affect long-term reliability.
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 25 non-isolated dc/dc converters 6.0 vdc - 14 vdc input, 0.8 vdc - 2.75 vdc /30 a outputs jan. 11, 2010 bel power inc., a subsid iary of bel fuse inc. pb-free reflow profile power systems will comply with j-std-020 rev. c (moist ure/reflow sensitivity classification for nonhermetic solid state surface mount devices) for both pb-free sold er profiles and msl classification procedures. this standard provides a recommended forced-air-convection refl ow profile based on the volume and thickness of the package. the suggested pb-free solder paste is sn/ag/cu (sac). the recommended linear reflow profile using sn/ag/cu solder is shown below. reflow temp ( c) 0 50 10 0 15 0 200 250 300 p reheat zo ne max 4 o cs -1 so ak zo ne 30-240s heat zo ne max 4 o cs -1 p eak temp 235 o c cooling zo ne 1- 4 o cs -1 t lim above 205 o c max temp solder ( c) 200 205 210 215 220 225 230 235 240 0 102030405060 reflow time (s) reflow profile for tin/lead (sn/pb) process time limit curve above 205 o c reflow for tin lead (sn/pb) process msl rating the slin-30e1ax modules have a msl rating of 2. storage and handling the recommended storage environment and handling procedur es for moisture-sensitive surface mount packages is detailed in j-std-033 rev. a (handling, packing, sh ipping and use of moisture/reflow sensitive surface mount devices). moisture barrier bags (mbb) with desicc ant are required for msl ratings of 2 or greater. these sealed packages should not be broken until time of use. on ce 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 minimu m of 12 months from the bag seal date, when stored at the following conditions: < 40 c, < 90% relative humidity. post solder cleaning and drying considerations post solder cleaning is usually the final circuit-board assemb ly process prior to electrical board testing. the result of inadequate cleaning and drying can affect both the re liability of a power module and the testability of the finished circuit-board assembly.
? 2010 bel fuse inc. specifications subject to change without notice. 011110 26 corporate far east europe bel fuse inc. bel fuse ltd. bel fuse europe ltd. 206 van vorst street 8f/ 8 luk hop street preston technology management centre jersey city, nj 07302 san po kong marsh lane, suite g7, preston tel 201-432-0463 kowloon, hong kong lancashire, pr1 8ud, u.k. fax 201-432-9542 tel 852-2328-5515 tel 44-1772-556601 www.belfuse.com fax 852-2352-3706 fax 44-1772-888366 www.belfuse.com www.belfuse.com non-isolated dc/dc converters 6.0 vdc - 14 vdc input, 0.8 vdc - 2.75 vdc /30 a outputs jan. 11, 2010 bel power inc., a subsidiary of bel fuse inc. revision history date revision changes detail approval 2010-1-11 a first release t. bubriski rohs compliance complies with the european directive 2002/95/e c, calling for the elimination of lead and other hazardous substances from electronic products.

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