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p/n 7q01d5wn000 ds heqb 25a 48v 1-8v_7q01_030603 rev 4a ? page 1 magnetek peg web site, www.magnetekpower.com h h h e e e q q q b b b - - - 2 2 2 5 5 5 a a a - - - 4 4 4 8 8 8 v v v - - - 1 1 1 . . . 8 8 8 v v v 4 4 8 8 v v i i n n 2 2 5 5 a a o o u u t t 1 1 . . 8 8 v v o o u u t t 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 q q u u a a r r t t e e r r b b r r i i c c k k 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 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: 88.5% ? wide input voltage range (36 to 75vdc) ? low profile, industry st andard footprint and pin out: 2.3" x 1.45" x 0. 36" (58.4mm x 36.8mm x 9.35mm) ? total weight: 34g. (1.2oz.) ? remote on/off ? output voltage trim ? remote sense ? fixed frequency (input -output ripple 400 khz) ? under voltage lockout (uvlo) ? auto recover ? over voltage protection ? auto recover ? over current protection ? auto recover ? over temperature protection ? auto recover ? operating temperature -40/+100c ? input to output is olation at 2000vdc,10m ? ? csa/us, csa, tuv and kema certified ? iso 9001 certified manufacturin g p rocesses 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 ? heqb 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 (0.36?), open frame construction allows smaller card pitch and improves system ventilation. ? fixed switching frequency provides predictable emi characteristics.
heqb?25a?48v?1.8v p/n 7q01d5wn000 rev 3.c ds heqb 25a 48v 1-8v_7q01_030603 rev 4a ? page 2 magnetek peg web site, www.magnetekpower.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 on/off external input signal, ttl. output voltage on or off 3 vin (+) positive terminal for the input bus 4 vout (+) positive terminal for output voltage 5 sense (+) positive remote sense 6 trim output voltage trim 7 sense (-) negative remote sense 8 vout (-) return terminal for output voltage 1.45 (36.83) 2.01 (51) 0.14 (3.68) 2.3 (58.42) 0.42 (10.8) 0.42 (10.8) 0.15x4 (3.81x4). 0.3 (7.62) 0.36 (9.35) 0.15 (4) 0.3 (7.62) ?=0.06 ( 2 pcs ) ( ?=1.5 ) ( 2 pcs ) ?=0.04 ( 6 pcs ) ( ?=1 ) ( 6 pcs ) bottom view
heqb?25a?48v?1.8v p/n 7q01d5wn000 rev 3.c ds heqb 25a 48v 1-8v_7q01_030603 rev 4a ? page 3 magnetek peg web site, www.magnetekpower.com 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 (typical value standard at nominal input line, full load, airf low 300 lfm, 25c ambient temper ature unless otherwise specified) input characteristics notes & conditions min typ max units operating input voltage range note 1 36 48 75 v input under-voltage lockout turn-on voltage threshold 34.3 34.8 35.4 v turn-off voltage threshold 33.8 34.3 34.8 v lockout hysteresis voltage 0.4 0.5 0.6 v maximum input current (i inmax ) v in =36v; full load 1.45 a no-load input current 40 60 ma off converter input current 4 6 ma inrush current transient rating 0.01 a 2 s input reflected-ripple current rms; see figures 1, 2 3 ma n n n o o o t t t e e e 1 1 1 : : : absolute max. input voltage 80v output characteristics notes & conditions min typ max units output voltage set point 50% load 1.757 1.8 1.803 v output voltage regulation load v nom = 48v 2 5 mv line i = 15a 2 5 mv temperature 10 20 mv total output voltage range 1.775 1.825 v output voltage ripple and noise 20 mhz bandwidth peak to peak 48 100 mv rms full load; see figure 1, 4 13 20 mv operating output current range 0 - 25 a output dc current limit inception 26 27 29 a output dc current limit shutdown voltage see figure 5 1.44 1.47 1.53 v admissible output capacitance full load, resistive 0 20.000 f dynamic characteristics notes & conditions min typ max units output voltage current transient 470 f load cap, 1a/ s; figures 8, 9 positive step change 50%i o to 75% i o 150 mv negative step change 75% i o to 50% i o 150 mv settling time to 1% 200 s turn-on transient figures 6 and 7 overshoot 0 % turn-on time full load 15 25 ms start-up inhibit period 120 ms efficiency notes & conditions min typ max units 100% load v in = 48v 88.5 % 80% load v in = 48v 89 % 56% load v in = 48v 89 % isolation characteristics notes & conditions min typ max units isolation voltage input - output basic isolation 2000 v dc isolation capacitance basic isolation 2200 pf isolation resistance 10 m ?
heqb?25a?48v?1.8v p/n 7q01d5wn000 rev 3.c ds heqb 25a 48v 1-8v_7q01_030603 rev 4a ? page 4 magnetek peg web site, www.magnetekpower.com feature characteristics notes & conditions min. typ. max units switching frequency double frequency for input-output ripple 190 200 210 khz on/off control off-state voltage 2.7 10 v on-state voltage 0 0.8 v output voltage trim range -10 +10 % output voltage remote sense range +10 % output over-voltage protection 115 119 123 % overcurrent protection threshold 26-35 a over-temperature shutdown average pcb temperature 125 c general characteristics notes & conditions min typ max units operating range temperature maximum rating -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 min. 1,500,000 hours safety and regulatory tuv and kema certified for compliance to en06950 requirements csa 22.2 no. 950-95(us and canada) certified with basic insulation for compliance to ul 1950. 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 c c c h h h a a a r r r a a a c c c t t t e e e r r r i i i s s s t t t i i i c c c c c c u u u r r r v v v e e e s s s figure 1: set-up diagram showing measurement points for: input terminal ripple curr ent, input reflected ripple current and output voltage ripple figure 2 - cerami c cap esr ic dc/dc converter vout is - figure 4 figure 3
heqb?25a?48v?1.8v p/n 7q01d5wn000 rev 3.c ds heqb 25a 48v 1-8v_7q01_030603 rev 4a ? page 5 magnetek peg web site, www.magnetekpower.com figure 3: input terminal ripple current, set-up per figure 1; 10 h source impedance and 47 f electrolytic capacitor nominal input voltage at full rated load. figure 2: input reflected ripple current, set-up per figure 1; 10 h source impedance. nominal input voltage at full rated load. figure 5: load current as a function of time while attempting to enable into a short circuit, <10m ? . figure 4: output voltage ripple, set-up per figure 1; 1 f ceramic capacitor and 10 f tantalum capacitor. nominal input voltage at full rated load
heqb?25a?48v?1.8v p/n 7q01d5wn000 rev 3.c ds heqb 25a 48v 1-8v_7q01_030603 rev 4a ? page 6 magnetek peg web site, www.magnetekpower.com figure 7: turn-on transient at zero load. figure 8: output voltage response to dynamic change in load current: 75% i o to 50%i o , where di / dt = 0.1a / s load cap: 10 f, 100 m ? esr tantalum capacitor and 1 f ceramic capacitor figure 6: turn-on transient at full rated load. figure 9: output voltage response to step-change in load current. 50%i o to 75% i o , where di / dt = 1a / s load cap: 470 f, 30 m ? esr tantalum capacitor and 1 f ceramic capacitor
heqb?25a?48v?1.8v p/n 7q01d5wn000 rev 3.c ds heqb 25a 48v 1-8v_7q01_030603 rev 4a ? page 7 magnetek peg web site, www.magnetekpower.com figure 10 : efficiency vs. load current for different input voltages at 25c figure 11 : power dissipation vs. load current for different input voltages at 25c 60 65 70 75 80 85 90 95 10 12 14 16 18 20 22 24 output current [a] efficiency [%] vin= 36v vin= 48v vin= 72v 0 1 2 3 4 5 6 7 8 10 12 14 16 18 20 22 24 output current [a] power dissipation [w] vin= 36v vin= 48v vin= 75v
heqb?25a?48v?1.8v p/n 7q01d5wn000 rev 3.c ds heqb 25a 48v 1-8v_7q01_030603 rev 4a ? page 8 magnetek peg web site, www.magnetekpower.com figure 12: maximum output current derating curves vs. ambient air temperature. airflow rates of 100 lfm through 400 lfm with air flowing across (transversal) the converter from pin 1 to p in 3 at nominal in p ut volta g e. 0 5 10 15 20 25 0 2540557085 am bi ent ai r tem perat ure ( degc) i out ( a) 400 lfm 300 lfm 200 lfm 100 lfm figure 13: maximum output current derating curves vs. ambient air temperature. airflow rates of 0 lfm through 400 lfm with air flowing across the converter from output to input at nominal input voltage. 0 5 10 15 20 25 0 2540557085 ambient air temperature (degc) iout (a) 400 lfm 300 lfm 200 lfm 100 lfm 0 lfm
heqb?25a?48v?1.8v p/n 7q01d5wn000 rev 3.c ds heqb 25a 48v 1-8v_7q01_030603 rev 4a ? page 9 magnetek peg web site, www.magnetekpower.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 volt age, and higher than 2.7v to disable the output voltage. positive logic is an available option, a dd ??p? to the end of the ordering code. trim the output voltage can be trimmed by means of an external resistor connected between trim (pin 6) and +sense (pin 5) or -sense (pin 7). the selection of the re sistor follows the indust ry standard trim equation. an external resistor connected between trim and ?sense pi ns will decrease the output voltage. for a decrease of ? % of the nominal output voltage, calculate the value of the external resistor using the following equation: r trim-down = ? ? ? ? ? ? ? ? ? k 22 . 10 % 511 where ? = % 100 ? ? ? ? ? ? ? ? ? 1.8 v 1.8 target a resistor connected between trim and + s pins will in crease the output voltage. for a desired increase of ? % of the nominal output voltage, the va lue of the resistor should be: r trim-up = () ? ? ? ? ? ? ? ? ? ? ? ? ? ? + k 22 . 10 % 511 % 225 . 1 % 100 8 . 1 * 11 . 5 on /off vin (-) direct logic drive on /off vin (-) negative logic (permanently enabled) on /off vin (-) remote enable circuit vin (-) vin (-) open collector enable circuit
heqb?25a?48v?1.8v p/n 7q01d5wn000 rev 3.c ds heqb 25a 48v 1-8v_7q01_030603 rev 4a ? page 10 magnetek peg web site, www.magnetekpower.com 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 system critical load, t hen the remote sense pins should be connected to the system critical load. reference applicable section of data sheet for maximum voltage compensation. ensure sufficient margin to the over voltage threshold, review applicable sections of the data sheet and system loading: output over-voltage pr otection ?vs- system transient load condition(s). trim up 10 100 1000 10000 012345678910 % increase in output voltage trim resistance (kohms)
heqb?25a?48v?1.8v p/n 7q01d5wn000 rev 3.c ds heqb 25a 48v 1-8v_7q01_030603 rev 4a ? page 11 magnetek peg web site, www.magnetekpower.com thermal considerations the converter has internal thermal protection preventing hot spots on pcb from exceeding mfr?s recommended temperatures for reliable operation, reference over temperat ure 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 co nverter output voltage will fold back when the over temperature protecti on 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 overcurrent protection the overcurrent limit inception is typi cally 110% of the rated output current. when the overcurrent limit inception is exceeded the output voltage will decrease proportional to in crease to the load current. further increase in the load current will cause the output voltage to trip the under voltage protection threshold and enter fault protection, or hiccup reference figure 5. the converter will enter fault protecti on typically at 125% of rated output current. when the fault is removed the converte r will auto recover. q9 q4
heqb?25a?48v?1.8v p/n 7q01d5wn000 rev 3.c ds heqb 25a 48v 1-8v_7q01_030603 rev 4a ? page 12 magnetek peg web site, www.magnetekpower.com family code rated output current input voltage output voltage option 1- remote on/off logic option 2- mechanical option 3- pin length heqb 25a 48v 1.8v default ? negative logic p ? positive logic default ? open frame pl ? cold plate default ? 0.15? 1 ? 0.25? 2 ? 0.11? 3 ? 0.18? example: heqb-25a-48v-1.8v-ppl1, standard quarter bric k with positive logic, cold plate, and 0.25? pin length. europe magnetek peg via s.giorgio 642 52028- terranuova bracciolini, arezzo, italy phone: (+39) 055.9195.1 fax: (+39) 055.9195.248 us magnetek peg 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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