明纬电源MHB100系列100W DC DC半砖稳压单组输出转换器.PDF

明纬电源MHB100系列100W DC-DC半砖稳压单组输出转换器PDF,伽10WDc-DC半砖稳压单组输出转换器MHB100系列■外部输出调整+vin+Vin+Vout(pin 1)(pin 1)(pin 9)RTrrim-downTrimTrimMHB100MHB100n(pin7)RTrim-upRn-Vout-Vin(pin4)(pins算术1:修正电压上升接线算术2:修正电压下降接线The value of Rtrim-up defined asThe value of RTr m-down defined as(R1-R2X(Vo-Vo, nom))(R1-R2X(Vo, nom-Vol)RTrim-up(K2)RTrir-down(Kg2)(Vo-Vo, nomVo, nom-Vo)Where: RTrim-up is the external resistor in KohmWhere: RTrim-down is the external resistor in KohmVo, nom is the nominal output voltageVo, nom is the nominal output voltageVo is the desired output voltageVo is the desired outout voltageR1 and r2 are inside the unit and list in table 1R and r2 are inside the unit and ist in table 2OutputOutputVoltage(V)(Kohm)I(Kohm)Voltage(V)(Kohm)I(Kohm)5V583.35V5.85.3212V18.945463612v864524V4144246.97724V430120Table 1Table 2For example, to Trim-up the outputFor example, to Trim-down the outputvoltage of 5.0V model(MHB 100-48S05Voltage of 5.0V model (MHB100-48S05by 8% to 5. 4V, RTrim-up is calculatedby 8% to 4.6V, RTrim-cown isas follows:alculated as followsVo- Vo. nom=54-5.0=0.4VVo.nom-Vo=5.0-4.6=0.4VR1=5.8 KohmR1=5.8 KohmR2=3.3 KohmR2 =5.32 Kahm5.8-3.3×0.45.8-5.32×0.4=112(Kg2)Trim-doiw=9.18(K2)0404File Name: MHB 100-SPEC 2011-09-c8伽10WDc-DC半砖稳压单组输出转换器MHB100系列■热曲线MHB-100系列的工作湿度范围为40°C~+100C.当MHB-100系列工作时,适当的降载或风冷是必需的在任何工作条件下,外壳最高温度不可超过100°C下图为MHB-100系列没散热片时的降额扫线Power Dissipated VS Amb ient Temperature and Air Flow without heatsink-Natural Convection4520t.min.(0.1ms)100 ft /min (0.5 m/s)200fmin.(1.0m/s)米-300fmin.(1.5m/s)400 ft /min (2.0 m/s)分20+500 ft /min. (2.5 m/s)"“中-600 ft/min.(3.0m/s)700min.(3.5m/s)-800 ft /min.(4.0m/s)0203060708090100Ambient Temperature, Ta(C)Air Flow RateTypical Rca Air Flow Rate Typical RcaNatural convection20f/min (0. 1m/s)7.12C/W500mn.(2.5m2.96C/W Rca: Thermal resistance from case toambience100tmn(05ms)6.21C/W60/mn(30ms)2.53℃/W200fmn(10m)5.17℃/W700tmin.(3.5m/s)2.37℃/W300m(15ms)4.29c/W800min40ms)219c/W400fmn(20ms3.64c/WExampleWhat is the minimum airflow necessary for a MHB100-48S12 operates at nominal line, an output current of 8. 3A, and a maximum ambienttemperature of40℃CSolutionGiven: Vin=48Vdc, Vo=12Vdc, Io=8.3A, m(unit efficiency )=89%Determine Power dissipation(Pd)Pa=Pi-Po=Po(1-n)/nPa=12×83×(1-0.89)0.89=1231 WattsDetermine airflowGiven: Pd=12.31W and Ta=40CCheck Thermal Curve aboveminimum airflow= 300 ft /minVerifying: The maximum temperature rise AT= Pd x Rca=12. 31x429=528CThe maximum case temperature Tc=Ta+△T=928℃<100℃Where: The rca is thermal resistance from case to ambienceThe ta is ambient temperature and the Tc is case temperature.File Name: MHB 100-SPEC 2011-09-c8伽10WDc-DC半砖稳压单组输出转换器MHB100系列■机壳散热片(可选)单位mm型号:MC308(垂直方向散热片)型号:MC091(水平方向散热片)型号:MC092(水平方向散热片48.2050808R定R1CRO 3030Rea3. 90C/W(typ ) at natural convection4.70C/W(typ ) at natural convection3.00C/W(typ ) at natural convection1. C/W(typ ) at 100ft. /min. LFM)1.44C! W(typ ) at 100ft. min (LFM1.33C/W(typ ) at 200ft. min ( LFM)2.89C/W(typ ) at 100ft. /min (LFM)2.30C/W(typ ) at 200ft. /min (LFM)1.17C/W(typ ) at 200ft. min (LFM)1.12C/W(typ ) at 300ft /min. LFM)1. C/W(typ ) at 300ft. min LFM)1.04C/W(typ ) at 300ft/min. LFM)0. 97C/W(typ ) at 400ft /min (LFM)1.59C/W( typ ) at 400ft /min ( LFM)0.95C/W(typ ) at 400f /min (LFM)File Name: MHB 100-SPEC 2011-09-c8伽10WDc-DC半砖稳压单组输出转换器MHB100系列■散热片组装螺丝垫圈散热片导热片或合适的散热油散热片编号MC308M-C092导热片:56.9X60X0.25mm螺丝:SMP+SWM3X8L■电磁兼容建议电路※要求如下图外加元件以符合EN55022 class a传导要求+Vinn+Vout+outCC2MHB100Lo adCase -Vout-VoutC3C4Model noC1C3C4L1220uF/50V220uF50MHB10024S□|EsR01392ER<01392200pFN C3.4uHMHB100485147F10047F1001000100ESR<0179ESR<0.1793.4uH□=05,12,24File Name: MHB 100-SPEC 2011-09-c8