features 3.3 volts dc ? xed output up to 50 amps industry standard quarter brick 2.3 " x 1.45 " x 0.40 " open frame package wide range 36 to 75 vdc input voltages with 2250 volt basic isolation double lead-free assembly and attachment for rohs standards up to 165 watts total output power high ef? ciency synchronous recti? er topology stable no-load operation with no required external components operating temperature range -40 to +85 c. with no heat sink required meets ul/en 60950-1, csa-c22.2 no. 60950-1, safety approvals, 2nd edition extensive self-protection, current limiting and shut down features unique among quarter-brick dc/dc converters, the hpq-3.3/50-d48 series offers very high output current (up to 50 amps) in an industry standard quarter brick package requiring no heat sink. the hpq-3.3/50-d48 series delivers up to 165 watts ? xed voltage output for printed circuit board mount- ing. wide range inputs on the 2.3 " x 1.45 " x 0.40 " converter are 36 to 75 volts dc (48 volts nominal), ideal for datacom and telecom systems. the ? xed output voltage is regulated to within 1% and may be trimmed within 10% of nominal output. advanced automated surface mount assembly and planar magnetics deliver full magnetic and optical isolation with basic protection up to 2250 volts. to power digital systems, the outputs offer fast settling to current steps and tolerance of higher capacitive loads. excellent ripple and noise speci? cations assure compatibility to cpus, asics, programmable logic and fpgas. no minimum load is required. for systems needing controlled startup/ shutdown, an external remote on/off control may use either positive or negative polarity. remote sense inputs compensate for resistive line drops at high currents. a wealth of self-protection features avoid prob- lems with both the converter and external circuits. these include input undervoltage lockout and overtemperature shutdown using an on-board tem- perature sensor. excessive overcurrents limit their power using the hiccup autorestart technique and the outputs may be short-circuited inde? nitely. additional safety features include output overvolt- age protection and reverse conduction elimination. the synchronous recti? er topology offers high ef? ciency for minimal heat buildup and no heat sink operation. the hpq-3.3/50-d48 series meets safety certi? cations to ul/en/iec/csa 60950-1, 2nd edition and rfi/emi conducted/ radiated emission compliance to en55022-cispr22 with external ? lter. product overview embedded systems, datacom and telecom installations disk farms, data centers and cellular repeater sites remote sensor systems, dedicated controllers instrumentation systems, r&d platforms, auto- mated test ? xtures data concentrators, voice forwarding and speech processing systems applications $ +v in (2) (8) (3) (1) (7) Cv in opto isolation reference & error amp pulse transformer input undervoltage, input overvoltage, and output overvoltage comparators remote on/off control +v out (4) ?v out (6) v out trim +sense (5) ?sense switch control pwm controller figure 1. simpli? ed schematic n verters, hi g h out p ut s hutdown, an external remote o n /o ff c u se e i t h er p os i t i ve or ne g at i ve p o l ar i t y . typical unit typical topology is shown hpq-3.3/50-d48 series isolated high power quarter brick dc/dc converters for full details go to www.murata-ps.com/rohs www.murata-ps.com www.murata-ps.com email: sales@murata-ps.com 21 feb 2011 mdc_hpq-3.3/50-d48 series.a13 page 1 of 10
? please refer to the part number structure for additional ordering information and options. ? all speci? cations are at nominal line voltage and full load, +25 deg.c. unless otherwise noted. see detailed speci? cations. output capacitors are 1 f ceramic || 10 f electrolytic with no input caps.these caps are necessary for our test equipment and may not be needed for your application. ordering guide ? root model ? output input ef? ciency package v out (volts) i out (amps, max.) power (watts) r/n (mv pk-pk) regulation (max.) ? v in nom. (volts) range (volts) i in no load (ma) i in full load (amps) typ. max. line load min. typ. dimensions (inches) dimensions (mm) pinout hpq-3.3/50-d48 hpq-3.3/50-d48 3.3 3.3 50 50 165 165 50 50 100 100 0.2% 0.2% 0.2% 0.2% 48 48 36-75 36-75 80 80 3.82 3.82 88% 88% 90% 90% 1.45x2.3x0.40 1.45x2.3x0.40 36.8x58.4x10.2 36.8x58.4x10.2 p32 p32 dosa-compatible i/o connections (pin side view) pin function p32 pin function p32 1 neg. input* 5 neg. sense 2 remote on/off control 6 output trim 3 pos. input* 7 pos. sense 4 neg. output 8 pos. output mechanical specifications 2.30 (58.4) 2.00 (50.8) 2.15 (54.6) a 1.860 (47.2) a a pins 1-3, 5-7: 0.040 0.001 (1.016 0.025) pins 4 & 8: 0.060 0.001 (1.52 0.025) #m3-thread x 0.15 deep typical (4) places baseplate optional baseplate 0.50 (12.7) with baseplate 0.40 (10.2) without baseplate 0.18 (4.6) screw length must not go through baseplate. optional mounting holes, 4 places component locations are typical and may vary between models. 0.015 (0.4) min. clearance between highest component and pin shoulders 1.45 (36.8) 1.00 (25.4) b 1.30 (33.0) 0.600 (15.2) 4 eq. sp. @ 0.150 (3.8) b b bottom view 8 7 6 5 4 3 2 1 third angle projection dimensions are in inches (mm) shown for ref. only. components are shown for reference only. tolerances (unless otherwise speci?ed): .xx 0.02 (0.5) .xxx 0.010 (0.25) angles 2? * these converters are pin-for-pin/plug-compatible to competitive units. other units may use different pin numbering or alternate outline views. when laying out your pc board, follow the pin function. dosa designates pin 1 as +input and pin 3 as -input. important! always connect the sense pins. if they are not con- nected to a remote load, wire each sense pin to its respective voltage output at the converter pins. standard pin length is shown. please refer to the part number structure for alternate pin lengths. hpq-3.3/50-d48 series isolated high power quarter brick dc/dc converters www.murata-ps.com email: sales@murata-ps.com 21 feb 2011 mdc_hpq-3.3/50-d48 series.a13 page 2 of 10
nominal output voltage 3.3 hpq 50 - / d48 input voltage range: d48 = 36-75 volts (48v nominal) maximum rated output : current in amps family series: high power quarter brick - n conformal coating (optional) blank = no coating, standard h = coating added, optional, special quantity order rohs hazardous materials compliance c = rohs-6 ( does not claim eu rohs exemption 7bClead in solder ), standard y = rohs-5 (with lead), optional, special quantity order note: some model combinations may not be available. contact murata power solutions for availability. part number structure on/off control polarity n = negative polarity, standard p = positive polarity, optional baseplate (optional) blank = no baseplate, standard b = baseplate installed, optional quantity order b - c h performance and functional speci? cations all speci? cations are typical unless noted. see note 1. input input voltage range see ordering guide. recommended external fuse 10 amps fast blow start-up voltage 33.0 volts undervoltage shutdown 32.0 volts overvoltage shutdown none, see application notes. re? ected (back) ripple current (note 2) 20 ma pk-pk internal input filter type pi-type reverse polarity protection (note 15) none. install external fuse. input current: full load conditions see ordering guide. inrush transient 0.05 a 2 sec. shutdown mode (off, uv, ot) 10 ma output short circuit 50 ma no load, 3.3vout 80 ma low line (vin=vmin, 3.3vout) 5.21 amps remote on/off control (note 5) positive logic (p suf? x) on = +2.5 v. to +15 v. max. or open pin off = 0 to +1 v. max. or ground pin negative logic (n suf? x) on = -0.1 v. to +0.8 v. max. or ground pin off = +2.5 v. to +15 v. max. or open pin current 1 ma pin length option blank = standard pin length 0.180 in. (4.6 mm) l1 = 0.110 in. (2.79 mm)* l2 = 0.145 in. (3.68 mm)* *special quantity order required lx hpq-3.3/50-d48 series isolated high power quarter brick dc/dc converters www.murata-ps.com email: sales@murata-ps.com 21 feb 2011 mdc_hpq-3.3/50-d48 series.a13 page 3 of 10
output minimum loading no minimum load maximum output power 166.6 watts accuracy (50% load) 1 % of vsetting. see note 16. overvoltage protection (note 7) 4 volts temperature coef? cient 0.02% per c. of vout range ripple/noise (20 mhz bandwidth) see ordering guide and note 8. line/load regulation (see tech. notes) see ordering guide and note 10. ef? ciency see ordering guide remote sense compensation +10% max. deviation from output maximum capacitive loading, low esr 10,000 f max. see note 11. current limit inception (98% of vout setting) 59 amps (after warm up) see note 12. short circuit mode (notes 6, 12) short circuit current output 5 amps protection method hiccup autorecovery upon overload removal. (see note 12) short circuit duration continuous, no damage (output shorted to ground) isolation isolation voltage input to output 2250 vdc min. input to baseplate 1500 vdc min. baseplate to output 1500 vdc min. isolation resistance 10 megohms isolation capacitance 1000 pf isolation safety rating basic insulation dynamic characteristics dynamic load response (see note 1) 200 sec to within 1% of ? nal value. (50-75-50% load step) turn-on time 10 msec for vout regulated remote on/off time 10 msec for vout regulated switching frequency 400 40 khz environmental calculated mtbf (note 4) tbc operating temperature range (no baseplate) -40 to +85 c (with derating) maximum baseplate operating temperature +100 c storage temperature range -55 to +125 c thermal protection/shutdown (case temp. is measured in the center) +115 c relative humidity 85%/+85 c physical outline dimensions see mechanical speci? cations weight (without baseplate) 1.06 ounces (30 grams) electromagnetic interference (may require external ? lter) meets en55022, cispr22, class b, conducted and radiated safety meets ul/cul 60950-1 csa-c22.2 no. 60950-1 iec/en 60950-1, 2nd edition hpq-3.3/50-d48 series isolated high power quarter brick dc/dc converters www.murata-ps.com email: sales@murata-ps.com 21 feb 2011 mdc_hpq-3.3/50-d48 series.a13 page 4 of 10
absolute maximum ratings input voltage continuous 75 volts max. transient, 100 ms max. 100 volts max. output power 166.6 watts max. on/off control 0v. min. to +15 v. max. input reverse polarity protection none. install external fuse. output current current-limited. devices can withstand sustained short circuit without damage. storage temperature -55 to +125 c lead temperature see soldering guidelines. absolute maximums are stress ratings. exposure of devices to greater than any of these conditions may adversely affect long-ter m reliability. proper operation under conditions other than those listed in the performance/functional speci? cations table is not implied nor recommended. speci? cation notes (1) all models are tested and speci? ed with external 1||10 f output capacitors and no external input capacitor. all capacitor s are low esr types. these capacitors are necessary to accommodate our test equip- ment and may not be required to achieve speci? ed performance in your applications. all models are stable and regulate within s pec under no-load conditions. all speci? cations are typical unless noted. general conditions for speci? cations are +25 c, vin=nominal, vout=nominal, full load. adequate air? ow must be supplied for extended testing under power. (2) re? ected input ripple current is tested and speci? ed over a 5 hz to 20 mhz bandwidth. input ? ltering is cin=33 f, 100v, cbus=220 f, 100v electrolytic, lbus=12 h. (3) note that maximum power derating curves indicate an average current at nominal input voltage. at higher temperatures and/or lower air? ow, the dc/dc converter will tolerate brief full current outputs if the total rms current over time does not exceed the derating curve. all derating curves are presented at sea level altitude. be awa re of reduced power dissipation with increasing density altitude. (4) mean time before failure is calculated using the telcordia (belcore) sr-332 method 1, case 3, ground ? xed conditions, tpcb oard=+25 c, full output load, natural air convection. (5) the on/off control is normally controlled by a switch, relay or open collector or open drain transistor. but it may also be driven with external logic or by applying appropriate external voltages which are referenced to input common. (6) short circuit shutdown begins when the output voltage degrades approximately 2% from the selected setting. (7) the output is not intended to sink appreciable reverse current. this may damage the outputs. (8) output noise may be further reduced by adding an external ? lter. see i/o filtering and noise reduction. (9) all models are fully operational and meet published speci? cations, including cold start at C40 c. maximum power require s that the package temperature of all on-board components must never exceed +128c. (10) regulation speci? cations describe the deviation as the line input voltage or output load current is varied from a nominal midpoint value to either extreme. (11) the converter is normally speci? ed with the input/output ? ltering listed in note 1. higher capacitive load will reduce n oise but at the expense of delayed settling time, extended turn-on time and slower tran- sient response. use only as much output ? ltering as needed and no more. thoroughly test your system under full load with all components installed. low esr capacitors with high capacitance may degrade dynamic performance. (12) hiccup overcurrent operation repeatedly attempts to restart the converter with a brief, full-current output. if the over current condition still exists, the restart current will be removed and then tried again. this short current repeating pulse prevents overheating and damaging the converter. output current limit and short circuit prot ection is non-latching. once the fault is removed, the converter immediately recovers normal operation. (13) do not exceed maximum power speci? cations when adjusting the output trim. (14) at zero output current, the output may contain low frequency components which exceed the ripple speci? cation. the output may be operated inde? nitely with no load. (15) input fusing: to ensure reverse input protection, always connect an external input fast-blow fuse in series with the +vin input. (16) output accuracy is dependent on user-supplied trim resistors. to achieve high accuracy, use 1% or better tolerance metal- ? lm resistors. (17.) always connect the sense pins. if they are not connected to a remote load, wire each sense pin to its respective voltage output at the converter pins. soldering guidelines murata power solutions recommends the speci? cations below when installing these converters. these speci? cations vary dependin g on the solder type. exceeding these speci? ca- tions may cause damage to the product. your production environment may differ; therefore please thoroughly review these guideli nes with your process engineers. wave solder operations for through-hole mounted products (thmt) for sn/ag/cu based solders: for sn/pb based solders: maximum preheat temperature 115 c. maximum preheat temperature 105 c. maximum pot temperature 270 c. maximum pot temperature 250 c. maximum solder dwell time 7 seconds maximum solder dwell time 6 seconds hpq-3.3/50-d48 series isolated high power quarter brick dc/dc converters www.murata-ps.com email: sales@murata-ps.com 21 feb 2011 mdc_hpq-3.3/50-d48 series.a13 page 5 of 10
removal of soldered converters from printed circuit boards should removal of the converter from its soldered connection be needed, thor oughly de-solder the pins using solder wicks or de-soldering tools. at no time should any prying or leverage be used to remove converters that have not been properly de-soldered ? rst. input source impedance these converters must be driven from a low ac-impedance input source. the dc/dcs performance and stability can be compromised by the use of highly inductive source impedances. the input circuit shown in figure 2 is a practical solution that can be used to minimize the effects of inductance in the input traces. for optimum performance, components should be mounted close to the dc/dc converter. i/o filtering, input ripple current, and output noise all models in this series are tested/speci? ed for input ripple current (also called input re? ected ripple current) and output noise using the circuits and layout shown in figures 2 and 3. external input capacitors (c in in figure 2) serve primarily as energy-storage elements. they should be selected for bulk capacitance (at appropriate frequencies), low esr, and high rms-ripple-current ratings. the switching nature of dc/dc converters requires that dc voltage sources ha ve low ac impedance as highly inductive source impedance can affect system stability. in figure 2, c bus and l bus simulate a typical dc voltage bus. your speci? c system con? guration may necessitate additional considerations. in critical applications, output ripple/noise (also referred to as periodic and ran- dom deviations or pard) can be reduced below speci? ed limits using ? ltering techniques, the simplest of which is the installation of additional external out- put capacitors. output capacitors function as true ? lter elements and should be selected for bulk capacitance, low esr, and appropriate frequency response. in figure 3, the two copper strips simulate real-world pcb impedances between the power supply and its load. scope measurements should be made using bnc connectors or the probe ground should be less than ? inch and soldered directly to the test circuit. all external capacitors should have appropriate voltage ratings and be located as close to the converter as possible. temperature variations for all relevant parameters should be taken into consideration. figure 2. measuring input ripple current c in v in c bus l bus see specs for component values. 3 1 +input Cinput current probe to oscilloscope + C technical notes the most effective combination of external i/o capacitors will be a function of line voltage and source impedance, as well as particular load and layout conditions. figure 3. measuring output ripple/noise (pard) c1 c1 = 1f ceramic c2 = 10f tantalum load 2-3 inches (51-76mm) from module c2 r load 7 8 copper strip 4 5 copper strip scope +output Coutput +sense Csense start-up threshold and undervoltage shutdown under normal start-up conditions, these converters will not begin to regulate properly until the ramping input voltage exceeds the start-up threshold. once operating, devices will turn off when the applied voltage drops below the und- ervoltage shutdown point. devices will remain off as long as the undervoltage condition continues. units will automatically re-start when the applied voltage is brought back above the start-up threshold. the hysteresis built into this function avoids an indeterminate on/off condition at a single input voltage. see performance/functional speci? cations table for actual limits. start-up time the v in to v out start-up time is the interval between the point at which a ramping input voltage crosses the start-up threshold voltage and the point at which the fully loaded output voltage enters and remains within its speci? ed regulation band. actual measured times will vary with input source imped- ance, external input capacitance, and the slew rate and ? nal value of the input voltage as it appears to the converter. the on/off to v out start-up time assumes that the converter is turned off via the remote on/off control with the nominal input voltage already applied. on/off control the primary-side, remote on/off control function can be speci? ed to operate with either positive or negative polarity. positive-polarity devices ("p" suf? x) are enabled when the on/off pin is left open or is pulled high. positive-polarity devices are disabled when the on/off pin is pulled low (with respect to Cinput). negative-polarity devices are off when the on/off pin is high and on when the on/off pin is pulled low. see figure 4. dynamic control of the remote on/off function is best accomplished with a me- chanical relay or an open-collector/open-drain drive circuit (optically isolated if appropriate). the drive circuit should be able to sink appropriate current (see performance speci? cations) when activated and withstand appropriate voltage when deactivated. hpq-3.3/50-d48 series isolated high power quarter brick dc/dc converters www.murata-ps.com email: sales@murata-ps.com 21 feb 2011 mdc_hpq-3.3/50-d48 series.a13 page 6 of 10
figure 4. driving the remote on/off control pin 2 1 3 +vcc ref + in p u t equivalent circuit for positive and negative logic models control Ci n p u t o n /o f f c o n tr o l common temperature (see performance speci? cations), a precision temperature sensor will power down the unit. when the internal temperature decreases below the threshold of the temperature sensor, the unit will self start. output overvoltage protection the output voltage is monitored for an overvoltage condition via magnetic coupling to the primary side. if the output voltage rises to a fault condition, which could be damaging to the load circuitry (see performance speci? cations), the sensing cir- cuitry will power down the pwm controller causing the output voltage to decrease. following a time-out period the pwm will restart, causing the output voltage to ramp to its appropriate value. if the fault condition persists, and the output volt- ages again climb to excessive levels, the overvoltage circuitry will initiate another shutdown cycle. this on/off cycling is referred to as hiccup mode. input reverse-polarity protection if the input-voltage polarity is accidentally reversed, an internal diode will be- come forward biased and likely draw excessive current from the power source. if the source is not current limited or the circuit appropriately fused, it could cause permanent damage to the converter. input fusing certain applications and/or safety agencies may require the installation of fuses at the inputs of power conversion components. fuses should also be used if the possibility of a sustained, non-current-limited, input-voltage polarity reversal exists. for these converters, fast-blow fuses are recommended with values no greater than twice the maximum input current. trimming output voltage these converters have a trim capability that enables users to adjust the output voltage over a limited range (refer to the trim equations). adjustments to the out- put voltage can be accomplished with a single ? xed resistor as shown in figures 5 and 6. a single ? xed resistor can increase or decrease the output voltage depending on its connection. resistors should be located close to the converter and have tcrs less than 100ppm/c to minimize sensitivity to changes in temperature. if the trim function is not used, leave the trim pin open. on standard units, a single resistor connected from the trim pin to the +sense will increase the output voltage. a resistor connected from the trim pin to the Csense will decrease the output voltage. trim adjustments greater than the speci? ed trim range can have an adverse affect on the converters performance and are not recommended. excessive voltage differences between v out and sense, in conjunction with trim adjust- ment of the output voltage, can cause the overvoltage protection circuitry to activate (see performance speci? cations for overvoltage limits). temperature/power derating is based on maximum output current and voltage at the converters output pins. use of the trim and sense functions can cause output voltages to increase, thereby increasing output power beyond the converters speci? ed rating, or cause output voltages to climb into the output overvoltage region. therefore: (v out at pins) x (i out ) rated output power the trim pin is a relatively high impedance node that can be susceptible to noise pickup when connected to long conductors in noisy environments. sense input note: the sense and v out lines are internally connected through low-value re- sistors. nevertheless, if sense is not used for remote regulation, the user must connect + sense to + v out and -sense to -v out at the converter pins. sense is intended to correct small output accuracy errors caused by the resistive ohmic drop in output wiring as output current increases. this output drop (the differ- ence between sense and v out when measured at the converter) should not be allowed to exceed 0.5v. sense is connected at the load and corrects for resistive errors only. be careful where it is connected. any long, distributed wiring and/or signi? cant inductance introduced into the sense control loop can adversely affect overall system stabil- ity. if in doubt, test the application, and observe the dc/dcs output transient response during step loads. there should be no appreciable ringing or oscilla- tion. you may also adjust the output trim slightly to compensate for voltage loss in any external ? lter elements. do not exceed maximum power ratings. current limiting when power demands from the output falls within the current limit inception range for the rated output current, the dc/dc converter will go into a current limiting mode. in this condition the output voltage will decrease proportionately with increases in output current, thereby maintaining a somewhat constant power dissipation. this is commonly referred to as power limiting. current limit inception is de? ned as the point where the full-power output voltage falls below the speci? ed tolerance. if the load current being drawn from the converter is signi? cant enough, the unit will go into a short circuit condition. see short circuit condition. short circuit condition when a converter is in current limit mode the output voltages will drop as the output current demand increases. if the output voltage drops too low, the mag- netically coupled voltage used to develop primary side voltages will also drop, thereby shutting down the pwm controller. following the speci? ed time-out period, the pwm will restart, causing the output voltages to begin ramping to their appropriate values. if the short-circuit condition persists, another shutdown cycle will be initiated. this on/off cycling is referred to as hiccup mode. the hiccup cycling reduces the average output current, thereby preventing internal temperatures from rising to excessive levels. this converter is capable of enduring an inde? nite short circuit output condition. thermal shutdown these converters are equipped with thermal-shutdown circuitry. if the internal temperature of the dc/dc converter rises above the designed operating hpq-3.3/50-d48 series isolated high power quarter brick dc/dc converters www.murata-ps.com email: sales@murata-ps.com 21 feb 2011 mdc_hpq-3.3/50-d48 series.a13 page 7 of 10
typical performance curves ef? ciency vs line voltage and load current @ +25c maximum current temperature derating (vin=48v, no baseplate, longitudinal air ? ow) 65 70 75 80 85 90 95 ef?ciency (%) 5 101520253035404550 load current (amps) 2 4 6 8 10 12 14 16 18 20 22 24 loss (watts) v in = 36 v v in = 48 v v in = 75 v power dissipation v in = 48 v 10 15 20 25 30 35 40 45 50 output current (amps) 30 40 50 60 70 80 ambient temperature (c) 100 lfm 200 lfm 300 lfm 400 lfm load r trim down +output Cinput +input on/off control trim +sense Coutput Csense 4 5 1 3 6 8 7 2 figure 6. trim connections to decrease output voltages using fixed resistors up 1.225 x r t (k 7 ) = ? 16.863(1+) where is the absolute value of ( is always positive) 5.11 ? 10.22 ? 10.22 5.11 r t (k 7 ) = down hpq-3.3/50-d48 3.3 3.3 - v out () trim up trim down load r trim up +output Cinput +input on/off control trim +sense Coutput Csense 4 5 1 3 6 8 7 2 figure 5. trim connections to increase output voltages using fixed resistors maximum current temperature derating (vin=48v, with baseplate, longitudinal air ? ow) 30 35 40 45 50 55 60 65 70 75 80 85 0 10 20 30 40 50 60 100 lfm 200 lfm 300 lfm 400 lfm ambient temperature (c) output current (amps) hpq-3.3/50-d48 series isolated high power quarter brick dc/dc converters www.murata-ps.com email: sales@murata-ps.com 21 feb 2011 mdc_hpq-3.3/50-d48 series.a13 page 8 of 10
transient response transient response (25% load step) enable start-up enable start-up (vin=48v iout=0a) ripple and noise (1uf ceramic plus 10uf tantalum) ripple waveform (vin=48v iout=0a) transient response (50% load step) enable start-up (vin=48v iout=50a) ripple waveform (vin=48v iout=50a) hpq-3.3/50-d48 series isolated high power quarter brick dc/dc converters www.murata-ps.com email: sales@murata-ps.com 21 feb 2011 mdc_hpq-3.3/50-d48 series.a13 page 9 of 10
on/off enable control ground bounce protection to improve reliability, if you use a small signal transistor or other external circuit to select the remote on/off control, make sure to return the lo side directly to the Cvin power input on the dc/dc converter. to avoid ground bounce errors, do not connect the on/off return to a distant ground plane or current-carrying bus. if necessary, run a separate small return wire directly to the Cvin terminal. there is very little current (typically 1-5 ma) on the on/off control however, large current changes on a return ground plane or ground bus can accidentally trigger the converter on or off. if possible, mount the on/off transistor or other control circuit adjacent to the converter. noticeplease use only this customer data sheet as product documentation when laying out your printed circuit boards and applying this product into your application. do not use other materials as of? cial documentation such as adver- tisements, product announcements, or website graphics. we strive to have all technical data in this customer data sheet highly accurate and complete. this customer data sheet is revision-controlled and dated. the latest customer data sheet revision is normally on our website (www.murata- ps.com) for products which are fully released to manufacturing. please be especially careful using any data sheets labeled preliminary since data may change without notice. the pinout (pxx) and case (cxx) designations (typically p65 or c59) refer to a generic family of closely related information. it may not be a single pinout or unique case outline. please be aware of small details (such as sense pins, power good pins, etc.) or slightly different dimensions (baseplates, heat sinks, etc.) which may affect your application and pc board layouts. study the mechanical outline drawings, input/output connection table and all footnotes very carefully. please contact murata power solutions if you have any ques- tions. figure 7. on/off enable control ground bounce protection preferred location of on/off control adjacent to -vin terminal dc/dc converter install separate return wire for on/off control with remote transistor on/off control transistor do not connect control transistor through remote power bus ground plane or power return bus + vin on/off enable -vin return hpq-3.3/50-d48 series isolated high power quarter brick dc/dc converters murata power solutions, inc. makes no representation that the use of its products in the circuits described herein, or the use of other technical information contained herein, will not infringe upon existing or future patent rights. the descriptions contained her ein do not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. speci? cations are subject to cha nge without notice. ? 2011 murata power solutions, inc. www.murata-ps.com/locations email: sales@murata-ps.com murata power solutions, inc. 11 cabot boulevard, mans? eld, ma 02048-1151 u.s.a. iso 9001 and 14001 registered 21 feb 2011 mdc_hpq-3.3/50-d48 series.a13 page 10 of 10
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