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1、SWITCHING REGULATOR CONTROLM51995AP/FPMITSUBISHI(Dig./Ana.INTERFACE)(/27 )PIN CONFIGURATION(TOP VIEW)DESCRIPTIONM51995A is the primary switching regulator controller which isespecially designed to get the regulated DC voltage from AC powersupply.This IC can directly drive the MOS-FET with fast rise
2、and fast falloutput pulse.Type M51995A has the functions of not only high frequency OSCand fast output drive but also current limit with fast response andhigh sensibility so the true fast switching regulator can berealized.It has another big feature of current protection to short and overcurrent,owi
3、ng to the integrated timer-type protection circuit,if fewparts are added to the primary side.The M51995A is equivalent to the M51977 with externally re-settable OVP(over voltage protection)circuit.FEATURES 500kHz operation to MOS FET Output current.2A Output rise time 60ns,fall time 40ns Modified to
4、tempole output method with small through currentCompact and light-weight power supply Small start-up current.90A typ.Big difference between start-up voltage and stop voltage makes the smoothing capacitor of the power input section small.Start-up threshold 16V,stop voltage 10V Packages with high powe
5、r dissipation are used to with-stand the heat generated by the gate-drive current of MOS FET.16-pin DIP,20-pin SOP 1.5W(at 25C)Simplified peripheral circuit with protection circuit and built-in large-capacity totempole output High-speed current limiting circuit using pulse-by-pulse method(Two system
6、 of CLM+pin,CLM-pin)Protection by intermittent operation of output over current.Timer protection circuit Over-voltage protection circuit with an externally re-settable latch(OVP)Protection circuit for output miss action at low supply voltage(UVLO)High-performance and highly functional power supply T
7、riangular wave oscillator for easy dead time settingAPPLICATIONFeed forward regulator,fly-back regulator1161314151432125116107982017181914321651561471381291110RECOMMENDED OPERATING CONDITIONSSupply voltage range.12 to 36VOperating frequency.less than 500kHzOscillator frequency setting resistance T-O
8、N pin resistance RON.10k to 75k T-OFF pin resistance ROFF.2k to 30kCOLLECTORVOUTEMITTERVFON/OFFOVPDETF/BOutline 16P4Outline 20P2N-AVccCLM+CLM-GNDCTT-OFFCFT-ONCOLLECTORVOUTEMITTERVFON/OFFOVPDETF/BVccCLM+CLM-GNDCTT-OFFCFT-ONHEAT SINK PINHEAT SINK PINConnect the heat sink pin to GND.SWITCHING REGULATOR
9、 CONTROLM51995AP/FPMITSUBISHI(Dig./Ana.INTERFACE)(/27 )BLOCK DIAGRAMCLM-CURRENT LIMITF/BCOLLECTOREMITTERVOLTAGEREGULATORVVA363620.15VccVcc-4.0 to+4.0SymbolRatingsUnitParameterConditionsABSOLUTE MAXIMUM RATINGS VCCSupply voltageCollector voltageOutput currentVF terminal voltageON/OFF terminal voltage
10、CLM-terminal voltageVCIOVVFVVmAmW/C-0.3 to+4.0865010-1-2CLM+terminal voltageOVP terminal currentDET terminal voltagePower dissipationThermal derating factorOperating temperatureStorage temperaturePdKToprTstgWC1.512-30 to+85-40 to+125150Ta=25CTa25CTjJunction temperaturePeakContinuous2VON/OFFVCLM-VCLM
11、+IOVPVDETIDETVFBITONITOFFDET terminal input currentF/B terminal voltageT-ON terminal input currentT-OFF terminal input currentCCmAmAVmAVVVNote 1.+sign shows the direction of current flow into the IC and-sign shows the current flow from the IC.2.This terminal has the constant voltage characteristic o
12、f 6 to 8V,when current is supplied from outside.The maximum allowable voltage is 6V when the constant voltage is applied to this terminal.And maximum allowable current into this terminal is 5mA.3.The low impedance voltage supply should not be applied to the OVP terminal.VCCDETGNDUNDERVOLTAGELOCKOUTV
13、OUT2.5VOP AMPPWMLATCHPWMCOMPARATORINTERMITTENTACTIONINTERMITTENTACTION ANDOSC CONTROL-CURRENTLIMIT LATCH+CURRENTLIMIT LATCHOSCILLATOR(TRIANGLE)CLM+CURRENT LIMITCTINTERMITTENT OPERATIONDETERMINE CAPACITANCELATCH5006S1S3K1S1S15.2K7.1V5.8VON/OFFOVP(shut down)OSCILLATOR CAPACITANCE CFOSCILLATOR RESISTAN
14、CE T-ON(ON duty)OSCILLATOR RESISTANCE T-OFF(OFF duty)VFSWITCHING REGULATOR CONTROLM51995AP/FPMITSUBISHI(Dig./Ana.INTERFACE)(/27 )Vcc=Vcc(START)-Vcc(STOP)Operation stop voltageStand-by currentOperating supply voltage rangeOperating circuit currentCircuit current in OFF stateON/OFF terminal high thres
15、hold voltageCurrent at 0%dutyLimitsMin.Typ.Max.SymbolTest conditionsUnitParameterELECTRICAL CHARACTERISTICS(VCC=18V,Ta=25C,unless otherwise noted)VVcc(STOP)35BlockVCC(START)VCCVTHH ON/OFFVTHL ON/OFFVTHON/OFFIFBMIND16.217.2V9.09.910.96.37.690mAAVVVVdBAAVTerminal voltageTerminal resistanceDifference s
16、upply voltage between operation stop and OVP resetDetection voltageInput current of detection ampVoltage gain of detection ampOVP terminal hysteresis voltageOVP reset supply voltageIFBVFBRFBVCC(STOP)-VCCOVPCVDETIINDETGAVDETVTHOVPHVTHOVPITHOVPIINOVPVCCOVPCOperation start up voltage3Timer frequencyCur
17、rent from OVP terminal for OVP resetTimer charge currentOFF time/ON time ratioITHOVPCfTIMERITIMECHTIMEOFF/ONHzAmVmVnsCLM-terminal threshold voltageVTHCLM-IINCLM-TPDCLM-VTHCLM+IINCLM+TPDCLM+VCC(STOP)VccIccLIccOIcc OFFIcc CTIcc OVPIFBMAXDDifference voltage between operation start and stopCircuit curre
18、nt in timer OFF stateCircuit current in OVP stateON/OFF terminal low threshold voltageON/OFF terminal hysteresis voltageCurrent at maximum dutyCurrent difference between max and 0%dutyOVP terminal H threshold voltageOVP terminal threshold currentOVP terminal input currentCLM-terminal currentDelay ti
19、me from CLM-to VOUTCLM+terminal threshold voltageCLM+terminal currentDelay time from CLM+to VOUTVcc=14.5V,Ta=25CVcc=30VVcc=25VVcc=14VVcc=25VVcc=14VVcc=25VVcc=9.5VF/B terminal input currentF/B terminal input currentF/B terminal input current=0.95mAVVAnsAAVmVmVAmAmAmAVAAmAAmAAmA15.25.05014090401901510
20、211.310.955.02.01.33.02001253102.62.13.12.41.92.91602400.20.13.0-1.54-2.1-1.0-0.55-0.90-0.4090501401.350.952.0100200180220-205-270-140100IFB=IFBMIND-IFBMAXDVDET=2.5V-1.35-0.99-0.704.95.97.14206007802.42.52.61.03.030405407509603080150250801502507.59.010.00.551.20-480-320-213-210-140-930.270.400.60-19
21、3-138-102-178-127-94-147-105-787.08.711.0-220-200-180-170-125-90Vcc=14.5V,-30Ta85CVTHOVP=VTHOVPH-VTHOVPLVOVP=400mVOVP terminal is open.(high impedance)Vcc=30VVcc=18VCT=4.7FVCT=3.3V,Ta=-5CTa=25CTa=85C-5Ta85CVCLM-=-0.1V-5Ta85CVCLM+=0VSWITCHING REGULATOR CONTROLM51995AP/FPMITSUBISHI(Dig./Ana.INTERFACE)
22、(/27 )Maximum ON dutyUpper limit voltage of oscillation waveformOscillating frequencyVoltage difference between upper limit and lower limit of OSC waveformOSC frequency in CLM operating stateDuty in CLM operating stateVF voltage at timer operating startVF terminal input currentOutput low voltageOutp
23、ut high voltageOutput voltage rise timeLimitsMin.Typ.Max.SymbolTest conditionsUnitParameterELECTRICAL CHARACTERISTICS(VCC=18V,Ta=25C,unless otherwise noted)(CONTINUE)BlockfOSCTDUTYVOSCHVOSCLVOSCAVVVnsnsOutput voltage fall time4Lower limit voltage of oscillation waveformNo loadNo load17018820747.050.
24、053.03.974.374.771.761.962.162.112.412.7117018820710812414311.013.722.02.73.03.3260.050.40.71.40.691.01.32.016.016.515.516.05035VVVVkHz%kHzVVVfOSCVFTVFDUTYVTHTIMEIVFVOL1VOL2VOL3VOL4VOH1VOH2TRISETFALLVF=5VVF=2VVF=0.2VRON=20k,ROFF=17kCF=220pF,-5Ta85CfOSC=188kHzfOSC=188kHzfOSC=188kHzRON=20k,ROFF=17kCF=
25、220pFMin off duty/Max on dutySource currentVcc=18V,Io=10mAVcc=18V,Io=100mAVcc=5V,Io=1mAVcc=5V,Io=100mAVcc=18V,Io=-10mAVcc=18V,Io=-100mASWITCHING REGULATOR CONTROLM51995AP/FPMITSUBISHI(Dig./Ana.INTERFACE)(/27 )5TYPICAL CHARACTERISTICS0300600900120015001800025507510012515085THERMAL DERATING(MAXIMUM RA
26、TING)AMBIENT TEMPERATURE Ta(C)CIRCUIT CURRENT VS.SUPPLY VOLTAGE(OVP OPERATION)010.020.030.040.001.02.03.04.05.06.07.08.0SUPPLY VOLTAGE Vcc(V)CIRCUIT CURRENT VS.SUPPLY VOLTAGE(TIMER OFF STATE)010203040SUPPLY VOLTAGE Vcc(V)1.002.03.0CIRCUIT CURRENT VS.SUPPLY VOLTAGE(NORMAL OPERATION)SUPPLY VOLTAGE Vcc
27、(V)0203040105010010m12m14m16m18m22mCIRCUIT CURRENT VS.SUPPLY VOLTAGE(OFF STATE)SUPPLY VOLTAGE Vcc(V)AMBIENT TEMPERATURE Ta(C)0.30.40.50.60.70.80.91.01.1OVP TERMINAL THRESHOLD VOLTAGEVS.AMBIENT TEMPERATURE0102030401.002.03.0-40-20020406080100Ta=25CTa=85CTa=-30CTa=25CTa=85CTa=-30CTa=25CTa=85CTa=-30COV
28、P RESET POINT8.87V(-30C)8.94V(25C)9.23V(85C)H threshold voltage(VTHOVPH)L threshold voltage(VTHOVPL)RON=18kROFF=20kTa=-30CTa=25CTa=85CfOSC=500kHzfOSC=100kHzSWITCHING REGULATOR CONTROLM51995AP/FPMITSUBISHI(Dig./Ana.INTERFACE)(/27 )6AMBIENT TEMPERATURE Ta(C)AMBIENT TEMPERATURE Ta(C)AMBIENT TEMPERATURE
29、 Ta(C)AMBIENT TEMPERATURE Ta(C)AMBIENT TEMPERATURE Ta(C)THRESHOLD VOLTAGE OF ON/OFFTERMINAL VS.AMBIENT TEMPERATURETHRESHOLD VOLTAGE OF ON/OFFTERMINAL VS.AMBIENT TEMPERATUREINPUT CURRENT OF VF TERMINALVS.INPUT VOLTAGEDISCHARGE CURRENT OF TIMERVS.AMBIENT TEMPERATUREON AND OFF DURATION OF TIMERVS.AMBIE
30、NT TEMPERATURE(INTERMITTENT OPERATION)CHARGE CURRENT OF TIMER VS.AMBIENT TEMPERATURE3.43.23.02.82.62.42.01.8-40-2002040608010025.020.015.05.00-60-40-20020406080100101112131415161718-60-40-2002040608010017515012510075-60-40-200204060801001.41.31.21.11.0-60-40-20020406080100-40-60-80-100-120-160-140-1
31、80-2000-1-2-3-4-5-6-7-8-9-10012345678910VF TERMINAL VOLTAGE VVF(V)ON OFFOFF ONON OFFOFF ONTIMER ONTIMER OFFTIMER ONCIRCUIT OPERATION ONTIMER OFFCIRCUIT OPERATION OFFTa=25CTa=85CTa=-30C2.2SWITCHING REGULATOR CONTROLM51995AP/FPMITSUBISHI(Dig./Ana.INTERFACE)(/27 )7AMBIENT TEMPERATURE Ta(C)AMBIENT TEMPE
32、RATURE Ta(C)AMBIENT TEMPERATURE Ta(C)2.53.03.5-60-40-20020406080100VF THRESHOLD VOLTAGE FOR TIMERVS.AMBIENT TEMPERATURETHRESHOLD VOLTAGE OF CLM+TERMINALVS.AMBIENT TEMPERATURETHRESHOLD VOLTAGE OF CLM-TERMINALVS.AMBIENT TEMPERATURECLM+TERMINAL CURRENTVS.CLM+TERMINAL VOLTAGECLM-TERMINAL CURRENTVS.CLM-T
33、ERMINAL VOLTAGEOUTPUT HIGH VOLTAGE VS.OUTPUT SOURCE CURRENT-60-40-20020406080100-60-40-2002040608010000.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0-100-200-300-40001952002051952002050-0.2-0.4-0.6-0.8-1.0-100-200-300-400-50001m10m100m1100.60.81.01.21.41.61.82.02.22.42.6CLM+TERMINAL VOLTAGE VCLM+(V)CLM-TERM
34、INAL VOLTAGE VCLM-(V)OUTPUT SOURCE CURRENT IOH(A)Ta=25CTa=85CTa=-30CVcc=18VTa=25CTa=25CTa=-30CTa=85CSWITCHING REGULATOR CONTROLM51995AP/FPMITSUBISHI(Dig./Ana.INTERFACE)(/27 )8AMBIENT TEMPERATURE Ta(C)AMBIENT TEMPERATURE Ta(C)OUTPUT LOW VOLTAGEVS.OUTPUT SINK CURRENTDETECTION VOLTAGEVS.AMBIENT TEMPERA
35、TUREINPUT CURRENT OF DETECTION AMPVS.AMBIENT TEMPERATUREDETECTION AMP VOLTAGE GAINVS.FREQUENCYON dutyVS.F/B TERMINAL INPUT CURRENTON dutyVS.F/B TERMINAL INPUT CURRENT5.04.03.02.01.001m10m100m110-60-40-20020406080100-60-40-200204060801001001k10k100k1M10M50.040.030.020.010.00FREQUENCY f(Hz)2.402.452.5
36、02.55OUTPUT SINK CURRENT IOL(A)0.80.91.01.11.21.31.41.51.60102030405000.51.01.52.02.5F/B TERMINAL INPUT CURRENT IF/B(mA)F/B TERMINAL INPUT CURRENT IF/B(mA)00.51.01.52.02.501020304050Ta=25C(fOSC=100kHz)RON=18kROFF=20k(fOSC=200kHz)RON=18kROFF=20kTa=25CTa=-30CTa=85CTa=25CTa=-30CTa=85CVcc=18VVcc=5VSWITC
37、HING REGULATOR CONTROLM51995AP/FPMITSUBISHI(Dig./Ana.INTERFACE)(/27 )9AMBIENT TEMPERATURE Ta(C)AMBIENT TEMPERATURE Ta(C)AMBIENT TEMPERATURE Ta(C)ON duty VS.F/B TERMINAL INPUT CURRENTUPPER&LOWER LIMIT VOLTAGE OF OSCVS.AMBIENT TEMPERATUREOSCILLATING FREQUENCY VS.CFTERMINAL CAPACITYON duty VS.ROFFOSCIL
38、LATING FREQUENCY VS.AMBIENT TEMPERATUREOSCILLATING FREQUENCY VS.AMBIENT TEMPERATURE-60-40-20020406080100-60-40-20020406080100-60-40-2002040608010000.51.01.52.02.5110100100010000F/B TERMINAL INPUT CURRENT IF/B(mA)110100200300400500600700RON=24kROFF=20kCF=47pFRON=24kROFF=20kCF=330pF1101001000100000102
39、0304050607080901008090100110120010203040501.82.02.24.04.44.85.2ROFF(k)CF TERMINAL CAPACITY(pF)Ta=25CTa=85CTa=-30C(fOSC=500kHz)RON=18kROFF=20kRON=18kROFF=20kRON=22kROFF=12kRON=36kROFF=6.2kRON=24kROFF=20kfOSC=500kHzfOSC=200kHzfOSC=100kHzfOSC=100kHzfOSC=200kHzfOSC=500kHzRON=75k51k36k24k22k18k15k10k3333
40、335577SWITCHING REGULATOR CONTROLM51995AP/FPMITSUBISHI(Dig./Ana.INTERFACE)(/27 )10ON duty VS.AMBIENT TEMPERATUREON duty VS.AMBIENT TEMPERATUREON duty VS.AMBIENT TEMPERATURE010203040506070809010001020304050607080901000102030405060708090100AMBIENT TEMPERATURE Ta(C)-60-40-20020406080100AMBIENT TEMPERAT
41、URE Ta(C)-60-40-20020406080100AMBIENT TEMPERATURE Ta(C)-60-40-200204060801005.04.03.02.01.0002468101214161820EXPANSION RATE OF PERIOD(TIMES)EXPANSION RATE OF PERIOD(TIMES)02468101214161820INPUT VOLTAGE OF TERMINAL VS.EXPANSION RATE OF PERIODINPUT VOLTAGE OF TERMINAL VS.EXPANSION RATE OF PERIODOVP TE
42、RMINAL INPUT VOLTAGE VS.INPUT CURRENT1101001m0.20.40.60.81.0OVP TERMINAL INPUT VOLTAGE VOVP(V)01.02.03.04.05.0(fOSC=100kHz)RON=36k,ROFF=6.2kRON=22k,ROFF=12kRON=24k,ROFF=20kRON=22k,ROFF=22kRON=18k,ROFF=24kRON=15k,ROFF=27k(fOSC=200kHz)RON=36k,ROFF=6.2kRON=22k,ROFF=12kRON=24k,ROFF=20kRON=22k,ROFF=22kRO
43、N=18k,ROFF=24kRON=15k,ROFF=27k(fOSC=500kHz)RON=36k,ROFF=6.2kRON=22k,ROFF=12kRON=24k,ROFF=20kRON=22k,ROFF=22kRON=18k,ROFF=24kRON=15k,ROFF=27k123456123456(fOSC=100kHz)RON=15k,ROFF=27kRON=18k,ROFF=24kRON=22k,ROFF=22kRON=24k,ROFF=20kRON=22k,ROFF=12kRON=36k,ROFF=6.2k123456(fOSC=500kHz)RON=15k,ROFF=27kRON
44、=18k,ROFF=24kRON=22k,ROFF=22kRON=24k,ROFF=20kRON=22k,ROFF=12kRON=36k,ROFF=6.2k123456Ta=85CTa=25CTa=-30CSWITCHING REGULATOR CONTROLM51995AP/FPMITSUBISHI(Dig./Ana.INTERFACE)(/27 )11CURRENT FROM OVP TERMINAL FOR OVPRESET VS.SUPPLY VOLTAGESUPPLY VOLTAGE Vcc(V)05101520253035400100200300400500600700800Ta=
45、85CTa=25CTa=-30CSWITCHING REGULATOR CONTROLM51995AP/FPMITSUBISHI(Dig./Ana.INTERFACE)(/27 )FUNCTION DESCRIPTION12Type M51995AP and M51995AFP are especially designed for off-line primary PWM control IC of switching mode power supply(SMPS)to get DC voltage from AC power supply.Using this IC,smart SMPS
46、can be realized with reasonablecost and compact size as the number of external electric parts can be reduced and also parts can be replaced byreasonable one.In the following circuit diagram,MOS-FIT is used for outputtransistor,however bipolar transistor can be used with no problem.315131491011 12867
47、M51995AP516421ROFFRONACFINACR1R2CvccCTCFF/BOVPON/OFFVOUT1VOUT2APin No.is related with M51995APFig.1 Example application circuit diagram of feed forward regulator315131491011 12867M51995AP516421ROFFRONCFINACR1R22CvccCFVOUTPin No.is related with M51995APFig.2 Example application circuit diagram of fly
48、-back regulatorOVPF/BR21SWITCHING REGULATOR CONTROLM51995AP/FPMITSUBISHI(Dig./Ana.INTERFACE)(/27 )13Start-up circuit section The start-up current is such low current level as typical 90A,as shown in Fig.3,when the Vcc voltage is increasedfrom low level to start-up voltage Vcc(START).In this voltage
49、range,only a few parts in this IC,which has the function to make the output voltage low level,is alive andIcc current is used to keep output low level.The large voltagedifference between Vcc(START)and Vcc(STOP)makes start-up easy,because it takes rather long duration from Vcc(START)to Vcc(STOP).Osci
50、llator sectionThe oscillation waveform is the triangle one.The ON-durationof output pulse depends on the rising duration of the trianglewaveform and dead-time is decided by the falling duration.The rising duration is determined by the product of external resistor RON and capacitor CF and the falling