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p/n 7a0017wbxxx ds hehb 50a 48v 3-3v 7a00 rev07-08-03.doc? page 1 ? p p p r r r e e e l l l i i i m m m i i i n n n a a a r r r y y y magnetek peg web site , www.m agnetekpower.com h h h e e e h h h b b b - - - 5 5 5 0 0 0 a a a - - - 4 4 4 8 8 8 v v v - - - 3 3 3 . . . 3 3 3 v v v 4 4 8 8 v v i i n n 5 5 0 0 a a o o u u t t 3 3 . . 3 3 v v o o u u t t d d c c - - d d c c c c o o n n v v e e r r t t e e r r h h i i g g h h e e f f f f i i c c i i e e n n c c y y , , i i s s o o l l a a t t e e d d h h a a l l f f b b r r i i c c k k f f f e e e a a a t t t u u u r r r e e e s s s ? very high efficiency: 91% at 25a load, 90% at full rated load current ? wide input voltage range (35 to 75vdc) ? total weight: 77 grams (2.67 oz.) open-frame version ? low profile, industry standard footprint and pinout: 2.3" x 2.4" x 0.44" (58.4mm x 61.0mm x 11.2mm) ? back bias protection monolithic start-up, with pre-biased output ? parallel for increased power: external clock synchronization (option) current share, primary (option) ? soft start ? remote on/off ? output voltage trim ? industry standard trim equation ? remote sense ? fixed switching frequency (output ripple frequency @ 420 khz) ? under voltage lockout (uvlo), input ? auto recover ? over voltage protection ? auto recover ? over current protection ? auto recover ? over temperature protection ? auto recover ? operating temperature range: -40c to +100c ? input to output isolation at 2000vdc, 10m ? ? pending- ul/ c ul, csa/csa us , tuv and kema ? iso 9001 certified manufacturing processes p p p r r r o o o d d d u u u c c c t t t h h h i i i g g g h h h l l l i i i g g g h h h t t t s s s ? hehb family of dc-dc converters is magnetek?s solution for next generation, cutting-edge board applications. ? synchronous rectification uses mosfet instead of schottky diodes providing extreme reduction in heat generation, boosting efficiency, eliminating the need for a heat sink and increased reliability. ? low profile (0.44?), open frame construction allows smaller card pitch and improves system ventilation. ? fixed switching frequency provides predictable emi characteristics.
hehb?50a?48v?3.3v p/n 7a0017wbxxx ds hehb 50a 48v 3-3v 7a00 rev07-08-03.doc? page 2 ? p p p r r r e e e l l l i i i m m m i i i n n n a a a r r r y y y magnetek peg web site , www.m agnetekpower.com m m m e e e c c c h h h a a a n n n i i i c c c a a a l l l d d d r r r a a a w w w i i i n n n g g g s s s - all dimensions are in inches (mm) tolerances: x.xx in. +/-0.2 in. (0.5mm) pinout description pin name function 1 vin (-) negative terminal for the input bus 2 (no pin) optional current share, -f only a (no pin) optional clock sync, -f only 3 on/off remote enable/disable terminal, input signal ttl 4 vin (+) positive terminal for the input bus 5 vout (+) positive terminal for output voltage 6 sense (+) positive remote sense 7 trim output voltage trim 8 sense (-) negative remote sense 9 vout (-) return terminal for output voltage s s s p p p e e e c c c i i i f f f i i i c c c a a a t t t i i i o o o n n n s s s
hehb?50a?48v?3.3v p/n 7a0017wbxxx ds hehb 50a 48v 3-3v 7a00 rev07-08-03.doc? page 3 ? p p p r r r e e e l l l i i i m m m i i i n n n a a a r r r y y y magnetek peg web site , www.m agnetekpower.com (typical values are at nominal input li ne, full load, airflow 300 lfm, 25c ambient temperature unless otherwise specified) input characteristics notes & conditions min typ max units operating input voltage range note 1 35 48 75 v input surge voltage t< 100msec 100 v input under-voltage lockout turn-on voltage threshold 35.4 v turn-off voltage threshold 32.1 v lockout hysteresis voltage 3.3 v maximum input current (i inmax ) v in =36v; full load at nominal output voltage 5.2 a no-load input current 60 70 ma off converter input current 11 13 ma inrush current transient rating 0.03 a 2 s input reflected-ripple current rms; see figures 6,7,8 10 15 ma output characteristics notes & conditions min typ max units output voltage set point 50 % load 3.27 3.30 3.33 v output voltage regulation over load 5 8 mv over line 4 6 mv over temperature 10 25 mv total output voltage range over sample, line, load, temperature and life 3.24 3.36 v output voltage ripple and noise 20 mhz bandwidth peak to peak 30 60 mv rms full load see figures 6 & 9 6 10 mv operating output current range 0 - 50 a output dc current limit inception (hiccup mode: 30msec on, 220msec off) see figure 5 55 60 a admissible output capacitance full load, resistive 0 50,000 f dynamic characteristics notes & conditions min typ max units output voltage during load current transient 15 f load cap. 5a/ s; see figure 3,4 step change in i out (0.1a/ s) 50% to 75% iout max 65 mv step change in i out (1a/ s) 75% to 50% iout max 130 mv settling time to 1% of vout nom 200 s turn on transient see figures 1, 2 turn on time full load 160 200 ms rise time from 10% to 90% vnom 20 40 ms output voltage overshoot 10,000 f load capacitance, iout= 0a 0 % efficiency notes & conditions min typ max units 100% load 91 % 75% load 92 % 50% load vin = 50v 91 % note 1 : absolute max. continuous input voltage = 80v (operating) ; 100v (surge).
hehb?50a?48v?3.3v p/n 7a0017wbxxx ds hehb 50a 48v 3-3v 7a00 rev07-08-03.doc? page 4 ? p p p r r r e e e l l l i i i m m m i i i n n n a a a r r r y y y magnetek peg web site , www.m agnetekpower.com isolation characteristics notes & conditions min typ max units isolation voltage input to output basic isolation 2000 v dc isolation voltage input to plate basic isolation 2000 v dc isolation capacitance 2200 pf isolation resistance 10 m ? general characteristics notes & conditions min typ max units operating range temperature with appropriate power derating -40 +100 c storage temperature maximum rating -50 +120 c relative humidity non condensing 5 95 % calculated mtbf bellcore issue 4 rdf93 hrd issue 5 tba feature characteristics min. typ. max units switching frequency 420 khz on/off control off-state voltage 1.5 5 v on-state voltage 0 1.2 v output voltage trim range -20 +10 % current share (-f option) 50% of i max 3 5 % output over-voltage protection 115 120 130 % over-temperature shutdown pcb hot spot 125 c safety and regulatory (pending) tuv and kema certified for basic insula tion compliance to en06950 requirements ul and csa 22.2 no. 950-95(us and canada) certified with basic insulation for compliance to ul60950. note : an external input fuse must always be used for compliance to listed safety requirements. ce compliant per 72/23/eec (low voltage directive) and 93/68/eec to facilitate ce mark at system level. material flammability rating, ul94v-0 nebs compliant
hehb?50a?48v?3.3v p/n 7a0017wbxxx ds hehb 50a 48v 3-3v 7a00 rev07-08-03.doc? page 5 ? p p p r r r e e e l l l i i i m m m i i i n n n a a a r r r y y y magnetek peg web site , www.m agnetekpower.com p p p e e e r r r f f f o o o r r r m m m a a a n n n c c c e e e c c c u u u r r r v v v e e e s s s figure 2 . vout, turn-on transient at no load (vin=48v) (5 ms/div, 0.5v/div) figure 3 . output voltage response to dynamic change in load current: 75% i o to 50%i o , where: di / dt = 0.1 a / s load capacitance: 15 f, 30 m ? esr tantalum 1 f ceramic capacitor figure 4 . output voltage response to dynamic change in load current: 75% i o to 50%i o , where: di / dt = 1.3 a / s load capacitance: 15 f, 30 m ? esr tantalum 1 f ceramic capacitor figure 1 . vout, turn-on transient at full rated current (resistive load) (vin=48v) (5 ms/div, 0.5v/div)
hehb?50a?48v?3.3v p/n 7a0017wbxxx ds hehb 50a 48v 3-3v 7a00 rev07-08-03.doc? page 6 ? p p p r r r e e e l l l i i i m m m i i i n n n a a a r r r y y y magnetek peg web site , www.m agnetekpower.com figure 6 . test set-up diagram showi ng measurement point for input reflected ripple current and output voltage ripple. figure 7 - cerami c cap esr ic dc/dc converter vout is - figure 9 source impedance tantalum cap figure 5 . output current (50a/div) as a function of time while attempting to enable into a short circuit, <10m ? . top trace is an expansion of time of the bottom trace.
hehb?50a?48v?3.3v p/n 7a0017wbxxx ds hehb 50a 48v 3-3v 7a00 rev07-08-03.doc? page 7 ? p p p r r r e e e l l l i i i m m m i i i n n n a a a r r r y y y magnetek peg web site , www.m agnetekpower.com figure 7 . input reflected ripple current, set-up per figure 6; 10 h source impedance. nominal input voltage at full rated load. figure 8 . input terminal ripple current (ic) at full rated load and nominal input voltage. figure 9 . output voltage ripple at nominal input voltage and full rated load, set-up per figure 6, where: bandwidth; 20khz load capacitance; 15 f electrolytic capacitor 1f ceramic capacitor
hehb?50a?48v?3.3v p/n 7a0017wbxxx ds hehb 50a 48v 3-3v 7a00 rev07-08-03.doc? page 8 ? p p p r r r e e e l l l i i i m m m i i i n n n a a a r r r y y y magnetek peg web site , www.m agnetekpower.com figure 12 : maximum output current de-rating curves vs. ambient air temperature for airflow rates of 0 lfm through 400 lfm with air flowing from input to output and nominal input voltage. figure 13 : maximum output current de-rating curves vs. ambient air temperature for airflow rates of 100 lfm through 400 lfm with air flowing from pin 1 to pin 4 (transversal) and nominal input voltage. figure 10 . efficiency vs. load current for minimum, nominal and maximum input voltage at 25c. figure 11 power dissipation vs. load current for minimum, nominal and maximum input voltage at 25c. output current (a) output current (a)
hehb?50a?48v?3.3v p/n 7a0017wbxxx ds hehb 50a 48v 3-3v 7a00 rev07-08-03.doc? page 9 ? p p p r r r e e e l l l i i i m m m i i i n n n a a a r r r y y y magnetek peg web site , www.m agnetekpower.com f f f e e e a a a t t t u u u r r r e e e s s s a a a n n n d d d p p p i i i n n n s s s d d d e e e s s s c c c r r r i i i p p p t t t i i i o o o n n n remote on-off control the default logic is negative, where the remote on/off (pin 2) input is referenced to -vin (pin 1). the remote on/off signal must be lower than 0.8v to enable the output voltage, and higher than 2.7v to disable the output voltage. positive logic is an available option, add ??p? to the end of the ordering code. trimming the output voltage can be trimmed by means of an external resistor connected between trim (pin 6) and +sense (pin 6) or -sense (pin 8). the sele ction of the resistor follows the industry standard trim equation. an external resistor connected between trim and ?sense pins will decrease the output voltage. for a decrease of ? % of the nominal output voltage, calculat e the value of the external resistor using the following equation: r trim-down = ? ? ? ? ? ? ? ? ? k 2 % 100 , where ? = % 100 ? ? ? ? ? ? ? ? ? v v v nominal target nominal trim down 1 10 100 1000 0 2 4 6 8 10 12 14 16 18 20 % decrease in output voltage trim resistance (kohms) on /off vin (-) d irect logic d rive on /off vin (-) negative logic (permanently enabled) on /off vin (-) remote enable circuit vin (-) vin (-) open collector enable circuit
hehb?50a?48v?3.3v p/n 7a0017wbxxx ds hehb 50a 48v 3-3v 7a00 rev07-08-03.doc? page 10 ? p p p r r r e e e l l l i i i m m m i i i n n n a a a r r r y y y magnetek peg web site , www.m agnetekpower.com a resistor connected between trim and + s pins will increase the output voltage. for a desired increase of ? % of the nominal output voltage, the value of the resistor should be: r trim-up = k ? 2 v v v v v v nom tar nom tar ref nom ? + ? ? ? ? ? ? ? ? ? ? , where v nom = nominal voltage, v tar = target voltage, v ref =1.225 v sense (+ or -) the +sense or ?sense pins must be connected to the load or output pins of the converter. to ensure tight regulation at the syst em critical load, then the remote sense pins should be connected to the system critical load. reference applicabl e section of data sheet for maximum voltage compensation. ensure sufficient margin to the over voltage thres hold, review applicable sections of the data sheet and system loading: output over-voltage protecti on ?vs- system transient load condition(s). trim up 10 100 1000 012345678910 % increase in output voltage trim resistance (kohms)
hehb?50a?48v?3.3v p/n 7a0017wbxxx ds hehb 50a 48v 3-3v 7a00 rev07-08-03.doc? page 11 ? p p p r r r e e e l l l i i i m m m i i i n n n a a a r r r y y y magnetek peg web site , www.m agnetekpower.com thermal considerations the converter has internal thermal protection preventing hot spots on pcb from exceeding mfr?s recommended temperatures for reliable operation, refe rence over temperature protection threshold (section: feature characteristics). margin to the temperature protection limit should be verified in the application, and should not exceed 120 c on the thermal reference points as shown in figure 14. during an abnormal condition inducing an increase in the converter temperature, the converter output voltage will fold back when the over temper ature protection threshold is reached. the converter will auto-recover when the fault condition is corrected and time allowed for the converter to cool down. figure 14, thermal reference points over current protection the overcurrent limit inception is typically 110% of the rated output cu rrent will cause the output voltage enter fault protection, or hiccup reference figure 5. the c onverter will enter fault protection typically at 125% of rated output current. when t he fault is removed the converter will auto recover. to be installed in a later revision.
hehb?50a?48v?3.3v p/n 7a0017wbxxx ds hehb 50a 48v 3-3v 7a00 rev07-08-03.doc? page 12 ? p p p r r r e e e l l l i i i m m m i i i n n n a a a r r r y y y magnetek peg web site , www.m agnetekpower.com o o o r r r d d d e e e r r r i i i n n n g g g i i i n n n f f f o o o r r r m m m a a a t t t i i i o o o n n n : : : product family code rated output current input voltage output voltage option 1- remote on/off logic option 2- mechanical option 3- parallel option 4- pin length hehb 50a 48v 3.3v default negative p positive default open frame pl cold plate default ? none f ? clock sync & current share default 0.15? 1 0.25? 2 0.11? 3 0.20? example hehb-50a-48v-3.3v-pplf1 standard half brick with positive logic remote on/off, cold plate, (clock sync and current share) and 0.25? pin length options. europe magnetek s. p. a via s.giorgio 642 52028- terranuova bracciolini, arezzo, italy phone: (+39) 055.9195.1 fax: (+39) 055.9195.248 us magnetek inc. 8966 mason avenue chatsworth, ca 91311, usa phone: (+1) 818.727.2216 fax: (+1) 818.727.2276 toll-free number: (+1) 800.621.0733

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