vi cor corp. t el: 800-735-6200, 978-470-2900 fax: 978-475-6715 v48b48c250a dc-dc converter rev. 5.2 page 1 of 8 set your site on vicor at www.vicorpower.com shown actual size: 2.28 x 2.2 x 0.5 in 57,9 x 55,9 x 12,7 mm 4 5 absolute maximum ratings p arameter min typ max unit baseplate to sink; flat, greased surface 0.16 ?/watt baseplate to sink; thermal pad (p/n 20264) 0.14 ?/watt baseplate to ambient 8.0 ?/watt baseplate to ambient; 1000 lfm 1.9 ?/watt thermal capacity 83 watt-sec/? thermal resistance and capacity 48v in / 48vout / 250watts dc-dc converter module model number v48b48c250a * features dc input range: 36 - 75v input surge withstand: 100v for 100ms dc output: 48v programmable output: 10 to 110% regulation: 0.4% efficiency: 89.5% maximum operating temperature: 100? at full load power density: 100w/cubic inch height above board: 0.43 in. (10,9 mm) parallelable, with n+m fault tolerance low noise zcs/zvs architecture t ypical applications: telecommunications and distributed power systems product overview this dc-dc converter module uses 2nd generation power processing, control and packaging technologies to provide the performance, flexibility and cost effectiveness expected of a mature power component. for example, a plated-cavity core transformer couples widely separated primary and secondary windings, resulting in low in-to- out parasitic capacitance and noise. high frequency zcs/zvs switching, advanced power semiconductor packaging and thermal management provide high power density with low temperature gradients. extensive use of silicon integration results in 1/3 the part count of a 1st generation converter. * part numbering for pin styles see page 6. slotted baseplate (style 1) requires no designator. for threaded baseplate add a ??to the end of the part number. for thru-hole, add a ?? see page 7 for dimensions. see part numbering chart on this page for other product grades. p arameter rating unit notes +in to ?n voltage -0.5 to +75.0 vdc +in to ?n voltage 100 vdc <100ms pc to ?n voltage -0.5 to +7.0 vdc pr to ?n voltage -0.5 to +7.0 vdc +out to ?ut voltage -0.5 to +62.9 vdc +sense to ?ut voltage -0.5 to +62.9 vdc ?ense to ?ut voltage 1.0 vdc sc to ?ut voltage -0.5 to +1.5 vdc isolation voltage (in to out) 3000 vrms isolation voltage (in to base) 1550 vrms isolation voltage (out to base) 500 vrms storage temperature (c grade) -40 to +125 ? operating temperature (c gr ade) -20 to +100 c baseplate pin soldering temperature 500 (260) ? (?) <5 sec; wave solder pin soldering temperature 750 (390) ? (?) <7 sec; hand solder mounting torque 5 (0.57) in-lbs (n-m) 6 each, # 4-40 or m3 v48 b 15 c 250 a input voltage 24 = 24vin 48 = 48vin 300 = 300vin 375 = 375vin a = maxi b = mini c = micro output v oltage product grade temperatures (?) grade storage operating c = - 40 to +125 - 20 to +100 t = - 40 to +125 - 40 to +100 h = - 55 to +125 - 40 to +100 m = - 65 to +125 - 55 to +100 pin style base- plate output power
vi cor corp. t el: 800-735-6200, 978-470-2900 fax: 978-475-6715 v48b48c250a dc-dc converter rev. 5.2 page 2 of 8 set your site on vicor at www.vicorpower.com p arameter min typ max unit notes operating input voltage 36 48 75 vdc input surge withstand 100 vdc <100ms output voltage setpoint 47.37 48.00 48.62 vdc nominal input; full load; 25? output ovp setpoint 53.7 55.7 57.7 vdc 25 c; recycle input voltage to restart ( 1 minute off ) output power 250 watts at 100? baseplate temperature efficiency 88.5 89.5 % nominal input; 75% of full load; 25? p arameter min typ max unit notes line regulation ?.02 ?.30 % low line to high line; full load load regulation ?.06 ?.80 % no load to full load; nominal input t emperature regulation ?.002 ?.005 % / ? over operating temperature range ripple and noise, p-p 150 188 mv nominal input; full load; 20 mhz bandwidth current limit 5.31 5.99 7.29 amps output voltage 95% of nominal short circuit current 2.08 5.99 7.29 amps output voltage <250mv po w er sharing accuracy ? ? % 10 to 100% of full load programming range 10 110 % of nominal output voltage. for trimming below 90% of nominal, a minimum load of 10% of maximum r ated power may be required. module operating specifications module input specifications module output specifications electrical characteristics electrical characteristics apply over the full operating range of input voltage, output load (resistive) and baseplate temperat ure, unless otherwise specified. all temperatures refer to the operating temperature at the center of the baseplate. baseplate slotted (style 1) slotted baseplate (style 1) requires no designator. f or threaded baseplate add a "2" to the end of the part number. for thru-hole add a "3". pin style short (style 1) f or long pin configuration add ? to the end of the part number. see page 7 for pin dimensions. module mechanical specifications note: f or important information relative to applications where the converter modules are subject to continuous dynamic loading, contact vicor applications engineering at 800-927-9474. p arameter min typ max unit notes undervoltage turn-on 34.9 35.7 vdc undervoltage turn-off 29.4 30.5 vdc overvoltage turn-off/on 75.7 78.8 82.5 vdc dissipation, standby 3.9 5.8 watts no load
vi cor corp. t el: 800-735-6200, 978-470-2900 fax: 978-475-6715 v48b48c250a dc-dc converter rev. 5.2 page 3 of 8 set your site on vicor at www.vicorpower.com p arameter min typ max unit notes primary side (pc = primary control; pr = parallel) pc bias voltage 5.50 5.75 6.10 vdc pc current = 1.0 ma current limit 1.5 2.1 3.0 ma pc voltage = 5.5v pc module disable 2.3 2.6 2.9 vdc must be able to sink 4 ma. see fig. 1 pc module enable delay 4 7 ms pc module alarm 0.5 vavg uv, ov, ot, module fault. see figs. 2 and 4 pr emitter amplitude 5.7 5.9 6.1 volts pr load >30 ohms, < 30 pf pr emitter current 150 ma pr receiver impedance 375 500 625 ohms 25? pr receiver threshold 2.4 2.5 2.6 volts minimum pulse width: 20ns pr drive capability 12 modules without pr buffer amplifier secondary side (sc = secondary control) sc bandgap voltage 1.21 1.23 1.25 vdc referenced to ?ense sc resistance 990 1000 1010 ohms sc capacitance 0.033 ? sc module alarm 0 vdc with open trim; referenced to ?ense. see fig. 6 p arameter min typ max unit notes remote sense (total drop) 0.5 vdc 0.25v per leg (senses must be closed) isolation voltage (in to out) 3000 vrms complies with reinforced insulation requirements isolation voltage (in to base) 1550 vrms complies with basic insulation requirements isolation voltage (out to base) 500 vrms complies with operational insulation requirements isolation resistance (in to out) 10 megohms w eight 3.7 (104) 4 (112) ounces (grams) t emperature limiting 100 115 ? see figs. 2 and 4 agency approvals ul, csa, t?v, babt, ce, vde ul1950, csa950, en60950, vde0805, bs7002, iec 60950. with a fuse in series with the +input module control specifications module general specifications electrical characteristics, continued
vi cor corp. t el: 800-735-6200, 978-470-2900 fax: 978-475-6715 v48b48c250a dc-dc converter rev. 5.2 page 4 of 8 set your site on vicor at www.vicorpower.com control functions - pc pin module enable/disable the module may be disabled by pulling pc below 2.3v with respect to the ?nput. this may be done with an open collector transistor, relay, or optocoupler. multiple converters may be disabled with a single transistor or relay either directly or via ?r?ng?diodes. see figure 1. module alarm the module contains ?atchdog?circuitry which monitors input voltage, operating temperature and internal operating parameters. in the event that any of these parameters are outside of their allowable operating range, the module will shut down and pc will go low. pc will periodically go high and the module will check to see if the fault (as an example, overtemperature) has cleared. if the fault has not been cleared, pc will go low again and the cycle will restart. the sc pin will go low in the event of a fault and return to its normal state after the fault has been cleared. see figures 2 and 4. disable disable = pc <2.3v +out +s sc ? ?ut +in pc pr ?n figure 1 ?odule enable/disable. figure 3 ?ed on-state indicator. 4k ? "module enabled" +out +s sc ? ?ut +in pc pr ?n optocoupler +out +s sc ? ?ut +in pc pr ?n 4kw alarm 1.00v +out +s sc ? ?ut +in pc pr ?n +out +s sc ? ?ut +in pc pr ?n input undervoltage 2-20ms typ. f (v in ) auto restart 5.7vdc (0-3ma) 50 ? sw2 sw3 1.23 vdc 6k 1k sw1 sw1, 2, & 3 shown in "fault" position input overvoltage overtemperature module faults figure 2 ?c/sc module alarm logic. figure 5 ?solated on-state indicator. 2-20ms typ. fault sc pc 1.23v 5.7v 40 s typ. figure 4 ?c/sc module alarm timing. figure 6 ?econdary side on-state indicator. primary auxiliary supply at 5.7v, pc can source up to 1.5ma. in the example shown in figure 3, pc powers a module enabled led.
vi cor corp. t el: 800-735-6200, 978-470-2900 fax: 978-475-6715 v48b48c250a dc-dc converter rev. 5.2 page 5 of 8 set your site on vicor at www.vicorpower.com output voltage programming the output voltage of the converter can be adjusted or programmed via fixed resistors, potentiometers or voltage dacs. see figures 7 and 8. control functions - sc pin figure 8 ?utput voltage trim up circuit. figure 7 ?utput voltage trim down circuit. r d (ohms) = 1,000 vout vnom - vout r u trim up load +out +s sc ? ?ut error amp 1k ? 1.23v 0.033 f r d trim down load +out +s sc ? ?ut error amp 1k ? 1.23v 0.033 f t rim down 1. this converter is not a constant power device ?it has a constant current limit. hence, available output power is reduced by the same percentage that output voltage is trimmed down. do not exceed maximum rated output current. 2. the trim down resistor must be connected to the ?ense pin. t rim up 1. the converter is rated for a maximum delivered power. to ensure t hat maximum rated power is not exceeded, reduce maximum output current by the same percentage increase in output voltage. 2. the trim up resistor must be connected to the +sense pin. 3. do not trim the converter above maximum trim range (typically +10%) or the output over voltage protection circuitry may be activated. r u (ohms) = 1,000 ( v out-1.23 ) vnom 1,000 1.23 ( v out-vnom ) t rim resistor values calculated automatically: on-line calculators for trim resistor values are available on the vicor website at: vicorpower.com/tools.html. resistor values can be calculated for fixed trim up, fixed trim down and for variable trim up or down cases for both 1st and 2nd generation dc-dc converters. in addition to trimming information, the web site and the applications manual also include design tips, applications circuits, emc suggestions, thermal design guidelines and pdf data sheets for all available vicor products.
vi cor corp. t el: 800-735-6200, 978-470-2900 fax: 978-475-6715 v48b48c250a dc-dc converter rev. 5.2 page 6 of 8 set your site on vicor at www.vicorpower.com +sense from other modules in the array +in pc pr ?n +out +s sc ?ut ? figure 12 ?r?ng diodes connections. +out +s sc ? ?ut +out +s sc ? ?ut +out +s sc ? ?ut load +s ? +s ? +s ? module 2 module 1 +in pc pr ?n +in pc pr ?n module n+1 +in pc pr ?n figure 11 ?+1 module array o utput connections. figure 9 ?c coupled single-wire interface. module 2 (up to 12) module 1 ground plane +out +s sc ? ?ut +in pc pr ?n +out +s sc ? ?ut +in pc pr ?n module 2 (up to 12) module 1 ground plane +out +s sc ? ?ut +in pc pr ?n +out +s sc ? ?ut +in pc pr ?n figure 10 ?c coupled single-wire interface. 0.001? 0.001? the +out and ?ut power buses should be designed to minimize and balance parasitic impedance from each module output to the load. the +sense pins should be tied to the same point on the +out power bus; the ?ense pins should be tied to the same point on the ?ut power bus. at the discretion of the power system designer, a subset of all modules within an array may be configured as slaves by shorting sc to ?. or?ng diodes may be inserted in series with the +out pins of each module to provide module output fault tolerance. control functions - pr pin parallel operation the pr pin supports paralleling for increased power with n+1 (n+m) redundancy and phased array capability. modules of the same input voltage, output voltage, and power level will current share if all pr pins are suitably interfaced. compatible interface architectures include the following: dc coupled single-wire interface. all pr pins are directly connected to one another. this interface supports current sharing but is not fault tolerant. minus in pins must be tied to the same electric potential. see figure 9. ac coupled single-wire interface. all pr pins are connected to a single communication bus through 0.001 f (500v) capacitors. this interface supports current sharing and is fault tolerant except for the communication bus. see figure 10. pin styles * designator description notes (none) short solder requires in-board, mounting l long solder on-board mounting for 0.65" boards s short modumate surfmate or in-board socket mounting n long modumate on-board socket mounting * pin style designator follows the ??after the output power and precedes the baseplate designator. ex. v375a24c600an ?long modumate pins
vi cor corp. t el: 800-735-6200, 978-470-2900 fax: 978-475-6715 v48b48c250a dc-dc converter rev. 5.2 page 7 of 8 set your site on vicor at www.vicorpower.com (2x) 0.01 0.35 8,8 0.20** 5,1 0.12* 3,1 dia,(7x) 0.150 3,81 (ref) dia,(2x) 0.080 2,03 4 3 1 98 2 76 5 0.23 5,8 0.400 10,16 1.400 35,56 1.000 25,40 0.700 17,78 2.20 55,9 1.74 44,2 full r (6x) (6x) (ref.) 0.10 2,5 1.30 33,0 2.28 57,9 2.20 55,9 0.130 3,30 0.49 12,4 0.65 16,5 0.06 1,5 r( 3x) x 45? chamfer use a 4-40 screw (6x) to rque to: 5 in-lbs .57 n-m 0.54 13,7 0.43 10,9 pin style 2&n (long pin) 0.62 15,7 pin style 1&s (short pin) (9x) (9x) slotted (style 1) or threaded (style 2) 4-40 unc-2b (6x) or thru hole (style 3) #30 drill thru (6x) (0.1285) (all markings this surface) aluminum baseplate 0.50 0.02 12,7 0,5 * style 1 baseplate only ** style 2 & 3 baseplates *** reserved for vicor accessories not for mounting style 2 & 3 baseplates only (4x)*** 0.300 0.015 7,62 0,38 0.300 0.015 7,62 0,38 1.900 48,26 2.000 50,80 0.10 2,5 mechanical drawings 0.195 4,95 1.400* 35,56 1.000* 25,40 0.700* 17,78 0.400* 10,16 1.790 45,47 0.06 1,5 r (4x) 0.158 4,01 5 6 7 8 9 12 34 0.003 0,08 * denotes tol = pcb thickness 0.062 0.010 1,57 0,25 pin style 1&s 0.094 0.003 2,39 0,08 inboard solder mount 0.43 10,9 0.53 13,5 1.900* 48.26 1.900* 48,26 1.584* 40,23 0.164 0.003 4,16 0,08 pin style 2&n 0.094 0.003 2,39 0,08 onboard solder mount 0.164 0.003 4,16 0,08 plated thru hole dia (7x) (2x) unless otherwise specified, dimensions are in inches mm decimals tol. angles 0.xx ?.01 ?.25 ? 0.xxx ?.005 ?.127 all markings this surface pins styles style 1 & 2: tin/lead hot solder dipped style s & n: gold plated copper aluminum baseplate ies pcb mounting specifications converter pins no. function label 1 +in + 2 primary pc control 3p arallel pr 4 ?n 5 ?ut 6 ?ense ? 7 secondary sc control 8 +sense +s 9+out + module outline pins: tin/lead hot solder dip
vi cor corp. t el: 800-735-6200, 978-470-2900 fax: 978-475-6715 v48b48c250a dc-dc converter rev. 5.2 08/03 set your site on vicor at www.vicorpower.com v icor s comprehensive line of power solutions includes modular, high density dc-dc converters and accessory components, configurable power supplies, and custom power systems. information furnished by vicor is believed to be accurate and reliable. however, no responsibility is assumed by vicor for its use. no license is granted by implication or otherwise under any patent or patent rights of vicor. vicor components are not designed to be used in applications, such as life support systems, wherein a failure or malfunction could result in injury or death. all sales are subject to vicor s terms and conditions of sale, which are available upon request. specifications are subject to change without notice. vi cor corporation 25 frontage road andover, ma, usa 01810 t el: 800-735-6200 fax: 978-475-6715 email v icor express: vicorexp@vicr.com t echnical support: apps@vicr.com component solutions for your power system 4 5
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