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data sheet march 27, 2008 qbe025a0b series power modules, dc - dc converters: 42 ? 53vdc input; 12vdc output; 25a output current * iso is a registered trademark of the international organization of standards ** ul is a registered trademark of underwriters laboratories, inc. ? csa is a registered trademark of canadian standards association. ? vde is a trademark of verband deutscher elektrotechniker e.v. this product is intended for integration into end-use equipment. all of the required procedures of end-use equipment should b e followed. document no: ds03-078 ver. 1.25 pdf name: qbus-qbe025a.pdf applications ? distributed power architectures ? intermediate bus voltage applications ? telecommunications equipment ? servers and storage applications ? networking equipment options ? negative remote on/off logic ? active load sharing (parallel operation) ? baseplate option (-h) ? auto restart after fault shutdown ? case ground pin features ? compliant to rohs eu directive 2002/95/ec (-z versions) ? compliant to rohs eu dir ective 2002/95/ec with lead solder exemption (non-z versions) ? exceptionally high power density: 173 w/in 3 ? high efficiency ? 94% at 12v full load ? improved thermal performance: at 70oc at 1m/s (200lfm) ? delivers up to 25a output current ? low output ripple and noise ? industry standard quarter brick: 57.9 mm x 36.8 mm x 10.6 mm (2.28 in x 1.45 in x 0.42 in) ? cost efficient open frame design ? single optimal regulated output ? intermediate input voltage range ? constant switching frequency ? positive remo te on/off logic ? output over current/voltage protection ? overtemperature protection ? wide operating temperature range (-40c to 85c) ? iso* 9001 certified manufacturing facilities ? complies with and is licensed for basic insulation rating per en60950-1 ? ul ** 60950-1 recognised, csa ? c22.2 no. 60950- 1-03 certified, and vde ? 0805 (iec60950, 3 rd edition) licensed ? ce mark meets 2006/95/ec directive description the qbe025a0b series of dc-dc converters are an ex pansion of a new generation of dc/dc power modules designed to support 12vdc intermediate bus applications w here multiple low voltages are subsequently generated using discrete/modular point of load (pol) converters. the qbe025a0b series provide up to 25a output current in an industry standard quarter brick, which makes it an id eal choice for small space, high current and 12v intermediate bus voltage applications. the converter in corporates synchronous rectification technology and innovative packaging techniques to achieve ultra high efficiency reaching 94% at 12v full load. this leads to lower power dissipation such that for many applications a heat sink is not required. the qbe025a0b series power modules are isolated dc-dc c onverters that operate over an input voltage range from 42 to 53 vdc and provide a single regulated 12v output. the out put is fully isolated from the input, allowing versatile polarity configurations and grounding connections. built-in filtering for both input and output minimizes the need for external filtering. rohs compliant
data sheet march 27, 2008 qbe025a0b series power modules, dc - dc converters: 42 ? 53vdc input; 12vdc output; 25a output current lineage power 2 absolute maximum ratings stresses in excess of the absolute maximum ratings ca n cause permanent damage to the device. these are absolute stress ratings only, functional operation of the dev ice is not implied at these or any other conditions in excess of those given in the operati ons sections of the data sheet. exposu re to absolute maximum ratings for extended periods can adversely affect the device reliability. parameter device symbol min max unit input voltage* continuous v in -0.3 54 vdc non- operating continuous v in -0.3 75 vdc operating ambient temperature all t a -40 85 c (see thermal considerations section) storage temperature all t stg -55 125 c i/o isolation voltage (100% factory hi-pot tested) all ? ? 1500 vdc * input over voltage protection will shutdown the output voltage when the input voltage exceeds threshold level. electrical specifications unless otherwise indicated, specificati ons apply over all operating input vo ltage, resistive load, and temperature conditions. parameter device symbol min typ max unit operating input voltage v in 42 48 53 vdc maximum input current i in,max - - 8.5 adc (v in =0v to 53v, i o =i o, max ) inrush transient all i 2 t - - 1 a 2 s input reflected ripple current, peak-to-peak (5hz to 20mhz, 12 h source impedance; v in = 48v, i o = i omax ; see figure 9) all - 24 - map-p input ripple rejection (120hz) all - -50 - db caution: this power module is not internally fused. an input line fuse must always be used. this power module can be used in a wide variety of appl ications, ranging from simple standalone operation to being part of a complex power architecture. to preserve maximum fl exibility, internal fusing is not included, however, to achieve maximum safety and system protection, always us e an input line fuse. the safety agencies require a fast- acting fuse with a maximum rating of 15 a (see safety cons iderations section). based on the information provided in this data sheet on inrush energy and maximum dc input curr ent, the same type of fuse with a lower rating can be used. refer to the fuse manufacturer?s data sheet for further information.
data sheet march 27, 2008 qbe025a0b series power modules, dc - dc converters: 42 ? 53vdc input; 12vdc output; 25a output current lineage power 3 electrical specifications (continued) parameter device symbol min typ max unit output voltage set-point all v o, set 12 v dc (v in = in, min , i o =i o, max , t a =25c) output voltage all v o 11.4 ? 12.6 % v o, set (over all operating input voltage, resistive load, and temperature conditions until end of life) output regulation line (v in =v in, min to v in, max ) all ? 0.2 % v o, set load (i o =i o, min to i o, max ) all ? 3 % v o, set temperature (t ref =t a, min to t a, max ) all ? 150 mv output ripple and noise on nominal output (v in =v in, nom and i o =i o, min to i o, max ) rms (5hz to 20mhz bandwidth) all ? 70 ? mv rms peak-to-peak (5hz to 20mhz bandwidth) all ? 200 ? mv pk-pk external capacitance all c o, max ? ? 10,000 f output current all i o 0 25 adc output current limit inception all i o, lim ? 28.5 ? adc efficiency v in = v in, nom , t a =25c all __ 94 ? % i o =i o, max , v o = v o,set switching frequency all f sw ? 300 ? khz dynamic load response ( io/ t=1a/10 s; v in =v in ,nom; t a =25c; tested with a 10 f aluminum and a 1.0 f tantalum capacitor across the load.) load change from io= 50% to 75% of io,max: peak deviation settling time (vo<10% peak deviation) 12v v pk t s ? __ 2 200 ? __ %v o, set s load change from io= 75% to 50% of io,max: peak deviation settling time (vo<10% peak deviation) v pk t s __ __ 2 200 __ %v o, set s
data sheet march 27, 2008 qbe025a0b series power modules, dc - dc converters: 42 ? 53vdc input; 12vdc output; 25a output current 4 lineage power isolation specifications parameter device symbol min typ max unit isolation capacitance c iso ? 2000 ? pf isolation resistance r iso 10 ? ? m ? general specifications parameter min typ max unit calculated mtbf (i o =80% of i o, max , t a =25c, airflow=1m/s(200lfm)) 2,600,000 hours weight ? 44 (1.55) ? g (oz.)
data sheet march 27, 2008 qbe025a0b series power modules, dc - dc converters: 42 ? 53vdc input; 12vdc output; 25a output current lineage power 5 feature specifications unless otherwise indicated, specificati ons apply over all operating input vo ltage, resistive load, and temperature conditions. see feature descriptions for additional information. parameter device symbol min typ max unit remote on/off signal interface (v in =v in, min to v in, max ; open collector or equivalent, signal referenced to v in- terminal) negative logic: device code suffix ?1? logic low = module on, logic high = module off positive logic: no dev ice code suffix required lo g ic low = module off, lo g ic hi g h = module on logic low specification remote on/off current ? logic low all i on/off ? ? 1.2 ma on/off voltage: logic low all v on/off 0.0 ? 1.2 v logic high ? (typ = open collector) all v on/off ? __ 5 v logic high maximum allowable leakage current all i on/off ? ? 50 a turn-on delay and rise times (i o =i o, max , v in = v in, nom, t a = 25 o c, ) case 1: time until v o = 10% of v o,set from application of vin with remote on/off set to on 12 t delay enable with vin D 15 D msec case 2: time until v o = 10% of v o,set from operation of remote on/off from off to on with vin already applied for at least one second. t delay enable with on/off D 1.5 D msec output voltage rise time (time for vo to rise from 10% of v o,set to 90% of vo, set) all trise D 1 msec output overvoltage protection (clamp) 12v 13 ? 15 v overtemperature protection all t ref ? 125 ? c (see thermal consideration section) input undervoltage lockout turn-on threshold all ? 39.5 42 v turn-off threshold all 39 40.5 ? v
data sheet march 27, 2008 qbe025a0b series power modules, dc - dc converters: 42 ? 53vdc input; 12vdc output; 25a output current 6 lineage power characteristic curves the following figures provide typical characteristics for t he qbe025a0b (12v, 25a) at 25oc. the figures are identical for either positive or neg ative remote on/off logic. 0 1 2 3 4 5 6 7 8 9 38 40 42 44 46 48 50 52 54 io=25a io=12.5a io =0 a input current, i i (a) input voltage, v o (v) on/off voltage output voltage v on/off (v) (2v/div) v o (v) (5v/div) time, t (500 s/div) figure 1. typical input characteristic at room temperature figure 4. typical start-up using remote on/off, negative logic version shown. 85 86 87 88 89 90 91 92 93 94 95 0 5 10 15 20 25 vin=42v vin=48v vin=53v effciency, (%) output current, i o (a) output current, output voltage i o (a) (5a/div) v o (v) (500mv/div) time, t (200 s/div) figure 2. typical converter efficiency vs. output current at room temperature figure 5. typical transient response to step change in load from 25% to 50% to 25% of full load at room temperature and 48 vdc input. output voltage, v o (v) (100mv/div) time, t (1 s/div) output current, output voltage i o (a) (5a/div) v o (v) (500mv/div) time, t (200 s/div) figure 3. typical output ripple and noise at room temperature and i o = i o,max figure 6. typical transient response to step change in load from 50% to 75% to 50% of full load at room temperature and 48 vdc input 53 vin 48 vin 42 vin
data sheet march 27, 2008 qbe025a0b series power modules, dc - dc converters: 42 ? 53vdc input; 12vdc output; 25a output current lineage power 7 characteristic curves (continued) the following figures provide typical characteristics for t he qbe025a0b (12v, 25a) at 25oc. the figures are identical for either positive or neg ative remote on/off logic. 11.7 11.8 11.9 12 12.1 12.2 12.3 42 44 46 48 50 52 54 io=25a io=12.5a io =0 a output voltage, v o (v) input voltage, v in (v) figure 7. typical output voltage regulation vs. input voltage at room temperature 11.7 11.8 11.9 12 12.1 12.2 0 5 10 15 20 25 vin=42v vin=48v vin=53v output voltage, v o (v) output current, i o (a) figure 8. typical output voltage regulation vs. output current at room temperature
data sheet march 27, 2008 qbe025a0b series power modules, dc - dc converters: 42 ? 53vdc input; 12vdc output; 25a output current 8 lineage power test configurations note: measure input reflected-ripple current with a simulated source inductance (ltest) of 12 h. capacitor cs offsets possible battery impedance. measure current as shown above. figure 9. input reflected ripple current 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 figure 10. output ripple and noise 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. figure 11. output voltage and efficiency test setup. = v o .i o v in .i in x 100 % efficiency design considerations input filtering the power module should be connected to a low ac-impedance source. a highly inductive source impedance can affect the stability of the power module. for the test conf iguration in figure 9, a 100 f electrolytic capacitor (esr<0.7 at 100khz), mounted close to the power module helps ensure the stability of the unit. consult the factory for further application guidelines. safety considerations for safety-agency approval of the system in which the power module is used, the power module must be installed in compliance with the spacing and separation requirements of the end-use safety agency standard, i.e., ul 1950, csa c22.2 no. 60950-00, and vde 0805:2001-12 (iec60950 3 rd ed). if the input source is non-selv (elv or a hazardous voltage greater than 60 vdc and less than or equal to 75vdc), for the module?s output to be considered as meeting the requirements for safety extra-low voltage (selv), all of the following must be true: ? the input source is to be provided with reinforced insulation from any other hazardous voltages, including the ac mains. ? one v in pin and one v out pin are to be grounded, or both the input and output pins are to be kept floating. ? the input pins of the module are not operator accessible. ? another selv reliability test is conducted on the whole system (combination of supply source and subject module), as required by the safety agencies, to verify that under a single fault, hazardous voltages do not appear at the module?s output. note: do not ground either of the input pins of the module without grounding one of the output pins. this may allow a non-selv voltage to appear between the output pins and ground. the power module has extra-low voltage (elv) outputs when all inputs are elv. the input to these units is to be provided with a maximum 15 a fast- acting (or time-delay) fuse in the unearthed lead.
data sheet march 27, 2008 qbe025a0b series power modules, dc - dc converters: 42 ? 53vdc input; 12vdc output; 25a output current lineage power 9 feature description remote on/off two remote on/off options are available. positive logic remote on/off turns the module on during a logic-high voltage on the on/off pin, and off during a logic low. negative logic remote on/ off turns the module off during a logic high and on during a logic low. negative logic, device code suffix "1," is the factory-preferred configuration. the on/off circuit is powered from an internal bias supply. to turn the power module on and off, the user must supply a switch to control the voltage between the on/off terminal and the vi (-) terminal (von/off). the switch can be an open collector or equivalent (see figure 12). a logic low is von/off = 0.0v to 0.8v. the typical ion/off during a logic low is 10 a. the switch should maintain a logic- low voltage while sinking 10a. during a logic high, the maximum von/off generated by the power module is 5.0v. the maximum allowable leakage current of the switch at von/off = 2.0v is 6.0a. if using an external voltage source, the maximum voltage v on/off on the pin is 14.0v with respect to the vi (-) terminal. if not using the remote on/off feature, perform one of the following to turn the unit on: for negative logic, short on/off pin to vi(-). for positive logic: leave on/off pin open. . v o (+) v o (?) v i (?) + ? i on/off on/off v i (+) loa d v on/off figure 12. remote on/off implementation overcurrent protection to provide protection in a fault output overload condition, the module is equipped with internal current-limiting circuitry and can endure current limiting for a few mili-seconds. if the overcurrent condition persists beyond a few milliseconds, the module will shut down a nd remain latched off. the overcurrent latch is reset by either cycling the input power or by toggling the on/off pin for one second. if the output overload condition still exists when the module restarts, it will shut down again. this operation will continue indefinitely until the overcurrent condition is corrected. an auto-restart option is also available. an auto- restart feature continually attempts to restore the operation until fault condition is cleared. input undervoltage lockout at input voltages above or below the input under/over voltage lockout limits, modul e operation is disabled. the module will begin to operate when the input voltage level changes to within the under and overvoltage lockout limits. overtemperature protection these modules feature an ov ertemperature protection circuit to safeguard against thermal damage. the circuit shuts down and latches off the module when the maximum device reference temperature is exceeded. the module can be restarted by cycling the dc input power for at least one second or by toggling the remote on/off signal for at least one second. output overvoltage clamp the output overvoltage clam p consists of a control circuit, independent of the primary regulation loop, that monitors the voltage on the output terminals and clamps the voltage when it exceeds the overvoltage set point. the control loop of the clamp has a higher voltage set point than the primary loop. this provides a redundant voltage control that reduces the risk of output overvoltage.
data sheet march 27, 2008 qbe025a0b series power modules, dc - dc converters: 42 ? 53vdc input; 12vdc output; 25a output current 10 lineage power feature description (continued) forced load sharing (parallel operation with ? p option) for additional power requirements, the power module can be configured for parallel operation with active load current sharing. good layout techniques should be observed for noise immunity when using multiple modules in parallel. to implement active load sharing, the following recommendations must be followed: ? the parallel pins of all units in parallel must be connected together. the path of these connections should be as direct as possible, but should not pass beneath the perimeter of the module body, except immediately adjacent to the parallel pin location. ? parallel modules must use the same 48v source. the v in (-) input pin is the return path for the active current share signal of the parallel pin. separate 48v sources will prevent the active current share return signal from being connected to other modules. ? the v in (-) input connection should never be disconnected from any of the parallel modules, while another of the parallel modules is operating, unless the v in (+) pin, or the parallel pin is also disconnected. the v in (-) input provides the internal logic ground and for the module?s primary circuits, including the active current share circuit; and there are sneak paths through the module?s internal control ics, when the v in (-) pin is disconnected (allowing the internal logic circuit to float), while the parallel pin and v in (+) pin are connected to other operating modules. these sneak paths do not cause permanent damage, but do create false conditions that can affect the module?s internal logic configuration. ? the on/off pins of all modules should also be tied together to the same external control circuitry, so that the modules are turned on and off at the same time, unless all pa rallel modules? on/off pins are tied to the input pins for automatic start upon application of input voltage. ? when modules in parallel applications contain the auto-restart (4) option, it is required that the total maximum load current value be less than 90% of [n-1] times the individual module output current rating, where n is the number of modules in parallel. for example, if the application is using three modules rated at 25a, then the maximum total load shall be less than 0.9 x (3-1) x 25a = 0.9 x 2 x 25a = 45a. this insures that a single module can shutdown without causing the total load to exceed the capability of the remaining operating module(s). the shutdown module can then automatically restart, and assume its share of the total load. ? in all parallel applications (including applications meeting the [n-1] sizing criteria discussed earlier), if it is expected that a protective shutdown event could cause more than one parallel module to shutdown (for example, over temperature due to a common fan failure, or gross over current affecting two or more modules simultaneously), then the use of the auto-restart (4) option is not recommended. the auto-restart interval of these modules is not synchronized to other modules, nor is it precise. there will not be a successful restart follo wing multiple module shutdowns, because the individual module?s restart timings will be different. there will not be sufficient module capacity to prevent the first module which restarts from experiencing an over current, and then again shutting down before the slowest module has restarted. meanwhile, the slowest module will then restart, and then shutdown during the interval the fastest module is waiting for its next restart. and so on and so on. in these cases, only latching shutdown modules should be used; and either toggling the v in source or the on/off pin to simultaneously restart the modules, following a shutdown, is advised. when not using the parallel feature, leave the share pin open.
data sheet march 27, 2008 qbe025a0b series power modules, dc - dc converters: 42 ? 53vdc input; 12vdc output; 25a output current lineage power 11 thermal considerations the power modules operate in a variety of thermal environments and sufficient cooling should be provided to help ensure reliable operation. thermal considerations incl ude ambient temperature, airflow, module power dissipation, and the need for increased reliability. a reduction in the operating temperature of the module wi ll result in an increase in reliability. the thermal data presented here is based on physical measurements taken in a wind tunnel. heat-dissipating components are mounted on the top side of the module. heat is removed by conduction, convection and radiation to the surrounding environment. proper cooling can be verified by measuring the thermal reference temperature (t h ). peak temperature (t h ) occurs at the position indicated in figure 13. for reliable operation this temperature should not exc eed the listed temperature threshold. figure 31. t ref temperature measurement location. the output power of the module should not exceed the rated power for the module as listed in the ordering information table. although the maximum t h temperature of the power modules is 110 c - 115 c, you can limit this temperature to a lower value for extremely high reliability. heat transfer via convection increased airflow over the module enhances the heat transfer via convection. the thermal derating figures (14-17) show the maximum output current that can be delivered by each module in the respective orientation without exceeding the maximum t h temperature versus local ambient temperature (t a ) for air flows of 1 m/s (200 ft./min) and 2m/s (400 ft./min). note that the natural convection condition was measured at 0.05 m/s to 0.1 m/s (10ft./min. to 20 ft./min.); however, systems in which these power modules may be used typically generate natural convection airflow rates of 0.3 m/s (60 ft./min.) due to other heat dissipating comp onents in the system. the use of figures 14 - 15 are shown in the following example: example what is the minimum airflow necessary for a qbe025a0b operating at vi = 48 v, an output current of 12a, and a maximum ambient temperature of 70 c in transverse orientation. solution: given: vi = 48v, io = 12a, ta = 70 c determine required airflo w (v) (use figure 14): v = t1 m/sec. ( 200 ft./min.) or greater. output current, i o (a) local ambient temperature, t a ( c) figure 14. output current derating for the qbe025a0b in the transverse orientation with no baseplate; airflow direction fr om vin(+) to vin(-); vin = 48v 0.0 5.0 10.0 15.0 20.0 25.0 30.0 0 20 40 60 80 100 natural convection 1m/s ( 200lfm ) 2m/s ( 400lfm ) 3m/s ( 600lfm ) output current, i o (a) local ambient temperature, t a ( c) figure 15. output current derating for the qbe025a0b (vo = 12v) in the transverse orientation with baseplate; airflow direction from vin(+) to vin(-); vin = 48v 0 5 10 15 20 25 30 0 20406080100 natural convection 1m/s (200lfm) 2m/s (400lfm) 3m/s ( 600lfm )
data sheet march 27, 2008 qbe025a0b series power modules, dc - dc converters: 42 ? 53vdc input; 12vdc output; 25a output current 12 lineage power 0.0 5.0 10.0 15.0 20.0 25.0 30.0 0 20 40 60 80 100 1m/s ( 200lfm ) 2m/s ( 400lfm ) 3m/s ( 600lfm ) output current, i o (a ) local ambient temperature, t a ( c) figure 16. output current derating for the qbe025a0b (vo = 12v) in the transverse orientation with baseplate and 0.25-inch high heatsink; airflow direction from vin(?) to vout(--); vin = 48v output current, i o (a ) local ambient temperature, t a ( c) figure 17. output current derating for the qbe025a0b (vo = 12v) in the transverse orientation with baseplate and 0.5-inch high heatsink; airflow direction from vin(?) to vout(--); vin = 48v please refer to the application note ?thermal characterization process for open-frame board- mounted power modules? for a detailed discussion of thermal aspects including maximum device temperatures. layout considerations the qbe025 power module series are low profile in order to be used in fine pitch system card architectures. as such, component clearance between the bottom of the power module and the mounting board is limited. avoid placing copper areas on the outer layer directly underneath the power module. also avoid placing via interconnects underneath the power module. for additional layout guide-lines, refer to the fltr100v10 data sheet. through-hole lead-free soldering information the rohs-compliant through-hole products use the sac (sn/ag/cu) pb-free solder and rohs-compliant components. they are designed to be processed through single or dual wave soldering machines. the pins have an rohs-compliant finish that is compatible with both pb and pb-free wave soldering processes. a maximum preheat rate of 3 c/s is suggested. the wave preheat process should be such that the temperature of the power module board is kept below 210 c. for pb solder, the recommended pot temperature is 260 c, while the pb-free solder pot is 270 c max. not all rohs-compliant through-hole products can be processed with paste-through-hole pb or pb-free reflow process. if additional information is needed, please consult with your lineage power representative for more details. post solder cleaning and drying considerations post solder cleaning is usually the final circuit-board assembly process prior to electrical board testing. the result of inadequate cleaning and drying can affect both the reliability of a power module and the testability of the finished circuit-board assembly. for guidance on appropriate soldering, cleaning and drying procedures, refer to lineage power board mounted power modules: soldering and cleaning application note (ap01-056eps). 0.0 5.0 10.0 15.0 20.0 25.0 30.0 020406080100 1m/s ( 200lfm ) 2m/s ( 400lfm ) 3m/s ( 600lfm )
data sheet march 27, 2008 qbe025a0b series power modules, dc - dc converters: 42 ? 53vdc input; 12vdc output; 25a output current lineage power 13 mechanical outline for qb e025a through hole module 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.) top view side view bottom view 36.8 (1.45) 57.9 (2.28) 4.6 (.18) min 1.57 (.062) dia solder plated pin shoulder, 5 plcs 1.02 (.040) dia solder plated pin, 5 plcs 0.25 (.010) min 2.36 (.093) dia solder-plated pin shoulder, 2 plcs 1.57 (.062) dia solder-plated pin, 2 plcs 3.6 (.14) 7.62 (.300) 3.81 (.150) 11.43 (.450) 15.24 (.600) v i (-) v i (+) on/off 50.8 (2.000) 10.8 (.43) 15.24 (.600) v o (-) v o (+) case parallel 10.5 (.41)
data sheet march 27, 2008 qbe025a0b series power modules, dc - dc converters: 42 ? 53vdc input; 12vdc output; 25a output current 14 lineage power mechanical outline for qbe025a-h (baseplate version) through hole module 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.) top view side view bottom view 36.8 (1.45) 57.9 (2.28) 4.6 (.18) min 1.57 (.062) dia solder plated pin shoulder, 5 plcs 1.02 (.040) dia solder plated pin, 5 plcs 0.25 (.010) min 12.7 (0.50) 2.36 (.093) dia solder-plated pin shoulder, 2 plcs 1.57 (.062) dia solder-plated pin, 2 plcs 3.6 (.14) 7.62 (.300) 3.81 (.150) 11.43 (.450) 15.24 (.600) v i (-) v i (+) on/off 10.8 (.43) 15.24 (.600) v o (-) v o (+) 5.3 (.21) 5.3 (.21) 47.24 (1.860) m3x 0.5 threaded mounting holes max screw torque 0.56 nm (5 inlb) 3.0 (0.12) max screw protrusion 50.80 (2.000) 26.16 (1.030) case parallel
data sheet march 27, 2008 qbe025a0b series power modules, dc - dc converters: 42 ? 53vdc input; 12vdc output; 25a output current lineage power 15 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.) 50.80 (2.000) vo (+) vo (-) 15.24 (.600) v i (+) v i (-) ? ? on/off 3.6 (.14) 10.8 (.43) 57.9 (2.28) 36.8 (1.45) 1.02 (.040) dia pin, 5 plcs 1.57 (.062) dia pin, 2 plcs case
data sheet march 27, 2008 qbe025a0b series power modules, dc - dc converters: 42 ? 53vdc input; 12vdc output; 25a output current document no: ds03-078 ver. 1.25 pdf name: qbus-qbe025a.pdf ordering information please contact your lineage power sales representativ e for pricing, availabili ty and optional features. table 1. device codes product codes input voltage output voltage output current efficiency connector type comcodes QBE025A0B1 48v (42-53vdc) 12v 25a 94% through hole 108981432 QBE025A0B1z 48v (42-53vdc) 12v 25a 94% through hole cc109107868 table 2. device options option suffix negative remote on/off logic 1 auto-restart 4 case ground pin (offered with baseplate option only) 7 base plate option -h active load sharing (parallel operation) -p rohs compliant z note: legacy device codes may contain a ?b option suffix to indica te 100% factory hi-pot tested to the isolation voltage specif ied in the absolute maximum ratings table. the 100% hi-pot test is now applied to all device codes, with or without the ?b option suff ix. existing comcodes for devices with the ?b suffix are still valid; however, no new comc odes for devices cont aining the ?b suffix will be created. world wide headquarters lineage power corporation 3000 skyline drive, mesquite, tx 75149, usa +1-800-526-7819 (outside u.s.a.: +1-972-284-2626 ) www.lineagepower.com e-mail: techsupport1@lineagepower.com asia-pacific headquarters tel: +65 6416 4283 europe, middle-east and africa headquarters tel: +49 89 6089 286 india headquarters tel: +91 80 28411633 lineage power reserves the right to make changes to the product(s) or information contained herein without notice. no liability is assumed as a result of their use or application. no rights under any patent accompany the sale of any such product(s) or information. ? 2008 lineage power corporation, (mesquite, texas) all international rights reserved.

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