specification model dc voltage current range rated power output line regulation load regulation switching frequency (typ.) external trim adj. range (typ.) voltage range surge voltage (100ms max.) under voltage lockout efficiency (typ.) input remote control output trimming working humidity storage temp., humidity temp. coefficient case material mtbf dimension others note weight output over current output over voltage (typ.) dc current full load no load 5v 12v 24v 5v 12v 24v 5v 12v 24v 75w 0 ~ 15a 0 ~ 6.25a 0 ~ 3.13a 0 ~ 15a 0 ~ 6.25a 0 ~ 3.13a 0 ~ 15a 0 ~ 6.25a 0 ~ 3.13a 75mvp-p 100mvp-p 10000uf 87% 240mvp-p 2000uf 87% 75mvp-p 10000uf 84% 24vdc 18 ~ 36vdc 50vdc power up: 17vdc, power down: 16vdc 100mvp-p 10000uf 88% 240mvp-p 2000uf 88% 75mvp-p 10000uf 84% 48vdc 36 ~ 75vdc 100vdc power up: 34vdc, power down: 32.5vdc 100mvp-p 10000uf 89% 240mvp-p 2000uf 89% 1.0% 0.2% 0.2% 400khz for 12/24vin, 300khz for 48vin 10% 83% 9 ~ 18vdc 25vdc power up: 8.8vdc, power down: 8vdc 7570ma 7200ma 7200ma 3780ma 50ma 3650ma 3650ma 1900ma 50ma 1800ma 1800ma 50ma 110 ~ 150% rated output power protection type : can be continuous, recovers automatically after fau lt condition is removed 100 5 of case temperature -40 ~ +100 ; thermal shutdown at 100 5 of case temperature (please refer to " thermal curve") please refer to "remote on/off control" for details 10%, please refer to "external output trimming" for details 0% ~ 95% rh max. -55 ~ +105 , 0 ~ 95% rh 0.03%/ (0~60 aluminum 1000k hrs . mil-hdbk-217f (25 ) typ 57.9*61 mm (2.28 "*0.5") (l*w*h) *12.7 "*2.40 92g 1. all parameters not specially mentioned are measured at 12,24,48vdc i nput, rated load and 25 of ambient temperature. 2. ripple & noise are measured at 20mhz of bandwidth by using a 12" twisted pair- wire terminated with a 1uf ceramic & 10uf tantalum capacitor across outpu t. 3. the power supply need to connect "+vout" to "+r.s" and "-vout" to "-r.s". 4. the power supply is considered a component which will be installed into a fi nal equipment. the final equipment must be re-confirmed that it still mee ts emc directives. for guidance on how to perform these emc tests, please refer to ?emi testing of c omponent power supplies.? file name:MHB75-spec 2011-09-08 75w dc-dc half-brick regulated single output converter half-brick size (2.28" 2.4" 0.5") with industry standard pin out 2:1 wide input range protections: short circuit / over current / over voltage / over temperat ure high efficiency up to 89% 1500vdc i/o isolation built-in remote on/off control built-in remote sense trimming output 10% five-sided shield metal case optional heat sinks for extended operating temperature output 2.5v/3.3v/15v available approvals: ul / cul / ce 3 years warranty function features : m h b 7 5 s e r i e s ripple & noise (max.) note.2 voltage accuracy note.3 isolation voltage isolation resistance i/p-o/p:1500vdc, i/p-case:1500vdc, o/p-case:1500vdc i/p-o/p:100m ohms / 500vdc / 25 / 70% rh environment protection function rated dc input 12vdc output short circuit over temperature filter pi-network 115 ~ 140% rated output voltage protection type : over current limiting, recovers automatically aft er fault condition is removed protection type : output voltage clamp by tvs diode compliance to en55022 (cispr22) class a with external components ( please refer to "emc suggestion circuit") compliance to en61000-4-2,3,4,5,6,8; en55024, light industry le vel, criteria a safety & operating emc (note 4) MHB75-12s05 MHB75-12s12 MHB75-12s24 MHB75-24s05 MHB75-2 4s12 MHB75-24s24 MHB75-48s05 MHB75-48s12 MHB75-48s24 safety standards ul60950-1 approved emc immunity emc emission external capacitive load (max.) 10000uf working temperature (typ.)
the MHB75 series allow the user to switch the power on and off electronically b y their remote on/off feature. high singal here disable output example control circuit(positive logic) -vin(pin4) MHB75 r.c.(pin2) logic table logic state(pin2) negative logic positive logic logic low-switch closed power off(<0.8vdc) logic high-switch open power on(open circuit) the MHB75 series are available with "positive logic" (standard) or "neg ative logic" (option). power on(<0.8vdc) power off(open circuit) note: 1.logic compatibility : r.c.(pin2) ~ -vin(pin4). 2.suffix "n" to the model number with negative logic remote on/off. 75w dc-dc half-brick regulated single output converter m h b 7 5 s e r i e s remote on/off control mechanical specification unit:inch[mm] file name:MHB75-spec 2011-09-08 pin no. assignment r.c. -vout trim 2 5 7 +vout case -r.s. +r.s. 9 3 6 8 +vin -vin assignment assignment assignment 1 4 pin no. pin no. pin no. side view 0.18 min. [4.6] 0.50 [12.7] r1.50 0.08 [2.03] 0.04 [1.02] bottom view mounting inserts m3*0.5 all dimensions in inches [mm] tolerance inches: x.xx= 0.02 , x.xxx= 0.010 millimeters: x.x= 0.5 , x.xx= 0.25 1.90 [48.3] 2.40 [61.0] 2.00 [50.8] 1.40 [35.56] 0.60 [15.24] 1 9 2 8 7 3 6 4 5 2.28 [57.9]
external output trimming +vin (pin1) +vin (pin1) +vout (pin9) +vout (pin9) -vin (pin4) MHB75 MHB75 -vin (pin4) -vout (pin5) -vout (pin5) trim (pin7) trim (pin7) where: is the external resistor r trim-up in kohm. figure 1 : trim-up voltage setup figure 2 : trim-down voltage setup where: is the external r trim-down resistor in kohm. r trim-up r trim-down r -load r -load the value of defined as: r trim-up the value of defined as: r trim-down (k ) (k ) (v -v , nom) o o (v , nom-v ) o o (r1-r2 (v -v , nom)) o o (r1-r2 (v , nom-v )) o o = = r trim-up r trim-down vo,nom is the nominal output voltage. vo is the desired output voltage. r1 and r2 are inside the unit and list in table 1 output voltage(v) r1 (kohm) r2 (kohm) 5v 5.8 8.25 12v 19.656 13.304 24v 42.215 16.923 table 1 for example, to trim-up the output voltage of 5.0v model (MHB75-48s05) by 8% to 5.4v, is calculated r trim-up as follows: vo - vo,nom = 5.4 -5.0 = 0.4v r1 = 5.8 kohm r2 = 8.25 kohm vo,nom is the nominal output voltage. vo is the desired output voltage. r1 and r2 are inside the unit and list in table 2. output voltage(v) r1 (kohm) r2 (kohm) 5v 5.8 10.57 12v 86.45 60.1 24v 430 130 table 2 for example, to trim-down the output voltage of 5.0v model (MHB75-48s05) by 8% to 4.6v, is r trim-down calculated as follows : vo,nom - vo = 5.0 - 4.6 = 0.4 v r1 = 5.8 kohm r2 = 10.57 kohm ) ) (k (k 6.25 3.93 0.4 0.4 5.8-8.25 0.4 5.8-10.57 0.4 = = = = r trim-up r trim-down 75w dc-dc half-brick regulated single output converter m h b 7 5 s e r i e s file name:MHB75-spec 2011-09-08
0 5 10 15 20 25 30 35 40 45 50 0 10 20 30 40 50 60 70 80 90 100 power disspated, p d (watts ) na tural co nvection 2 0 ft. /min . (0.1 m/s) 1 00 f t./min. (0 .5 m/s) 2 00 f t./min. (1 .0 m/s) 3 00 f t./min. (1 .5 m/s) 4 00 f t./min. (2 .0 m/s) 5 00 f t./min. (2 .5 m/s) 6 00 f t./min. (3 .0 m/s) 7 00 f t./min. (3 .5 m/s) 8 00 f t./min. (4 .0 m/s) thermal curve the operating case temperature range of mhb-75 series is -40 c to +100 c. whe n operate the mhb-75 series, proper de-rating or o o cooling is needed. the maximum case temperature under any operating condition should not b e exceed 100 c. the following curve is the de-rating curve of mhb-75 series without heat sink. o power dissipated vs amb ient temperature and air flow without heatsink ambi ent temperature, ta ( ) air flow rate air flow rate typical rca typical rca rca : thermal resistance from case to ambience natural convection 20ft./min. (0.1m/s) 7 . 1 2 / w 100 ft./min. (0.5m/s) 500 ft./min. (2.5m/s) 6 . 2 1 / w 2 . 9 6 / w 200 ft./min. (1.0m/s) 600 ft./min. (3.0m/s) 5 . 1 7 / w 2 . 5 3 / w 300 ft./min. (1.5m/s) 700 ft./min. (3.5m/s) 4 . 2 9 / w 2 . 3 7 / w 400 ft./min. (2.0m/s) 800 ft./min. (4.0m/s) 3 . 6 4 / w 2 . 1 9 / w 75w dc-dc half-brick regulated single output converter m h b 7 5 s e r i e s file name:MHB75-spec 2011-09-08 example: what is the minimum airflow necessary for a MHB75-48s12 operates at nomin al line, an output current of 6.25a, and a maximum ambient temperature of 40 ? solution: given: vin=48vdc, vo=12vdc, io=6.25a, (unit efficiency)=89% determine power dissipation (p ): p =12 6.25 (1-0.89)/0.89=9.27 watts determine airflow: given: p =9.27w and ta=40 check thermal curve above: minimum airflow= 100 ft./min. verifying: the maximum temperature rise 9.27 6.21=57.57 the maximum case temperature 97.57 <100 where: the rca is thermal resistance from case to ambience. the ta is ambient temperature and the tc is case temperature. d d d p =pi-po=po(1- )/ t = p rca= tc=ta+ t= d d
case heat sink (optional) unit:mm 75w dc-dc half-brick regulated single output converter m h b 7 5 s e r i e s file name:MHB75-spec 2011-09-08 58 58 48.2 48.2 12.7 25.4 2.7 2.7 50.8 50.8 48.20 cr0.3 2.-8.50 21 8-2 r1 5.-7.80 0.30 3 0.3 60.70 50.80 4- 3.3 61 61 58 model no.: m-c308 (vertical fins) model no.: m-c091(horizontal fi ns) model no.: m-c092 (horizontal fins) rca: 3.90 / w (typ.), at natural convection 1.74 / w (typ.), at 100ft./min.(lfm) 1.33 / w (typ.), at 200 ft./min.(lfm) 1.12 / w (typ.), at 300 ft./min.(lfm) 0.97 / w (typ.), at 400 ft./min.(lfm) rca: 4.70 / w (typ.), at natural convection 2.89 / w (typ.), at 100ft./min.(lfm) 2.30 / w (typ.), at 200 ft./min.(lfm) 1.88 / w (typ.), at 300 ft./min.(lfm) 1.59 / w (typ.), at 400 ft./min.(lfm) 0.95 / w (typ.), at 400 ft./min.(lfm) rca: 3.00 / w (typ.), at natural convection 1.44 / w (typ.), at 100ft./min.(lfm) 1.17 / w (typ.), at 200 ft./min.(lfm) 1.04 / w (typ.), at 300 ft./min.(lfm)
emc suggestion circuit screw washer heat sink thermal pad or suitable thermal grease 1 2 3 4 required external components to meet en55022 class a conducted emis sion are as below: model no. MHB75-12s MHB75-24s MHB75-48s =05,12,24 c1 c2 100uf/50v esr<0.33 100uf/50v esr<0.33 1000pf 1000pf 2200pf 100uf/50v esr<0.33 100uf/50v esr<0.33 33uf/100v esr<0.46 33uf/100v esr<0.46 c3 l1 1.5uh 1.5uh 8.3uh heat sink order no.: m-c308 m-c091 m-c092 thermal pad: 56.9x60x0.25mm screw: smp+sw m3x8l 75w dc-dc half-brick regulated single output converter m h b 7 5 s e r i e s file name:MHB75-spec 2011-09-08 heatsink assembly MHB75 c3 +vin -vin lo ad +vout -vout +vin -vin +vout -vout case l1 c1 c2
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