Transcription of UCx84x Current-Mode PWM Controllers
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UCx84x Current-Mode PWM Controllers
VINUC2843 VCCVREFRT/CTGROUNDCOMPVFBISENSEOUTPUTC opyright 2016, Texas Instruments IncorporatedProductFolderOrderNowTechnic alDocumentsTools &SoftwareSupport &CommunityAn IMPORTANTNOTICEat the end of this datasheetaddressesavailability,warranty, changes,use in safety-criticalapplications,intellectual propertymattersand ,UC2842,UC3842,UC1843,UC2843,UC3843UC184 4,UC2844,UC3844,UC1845,UC2845,UC3845 SLUS223F APRIL1997 REVISEDAPRIL2020 UCx84xCurrent-ModePWM Controllers1 Features11 Optimizedfor off-lineand DC-to-DCconverters Low start-upcurrent(< 1 mA) Automaticfeedforwardcompensation Pulse-by-pulsecurrentlimiting Enhancedload-responsecharacteristics Undervoltagelockoutwith hysteresis Double-pulsesuppression High-currenttotem-poleoutput Internallytrimmedbandgapreference Up to 500-kHzoperation Erroramplifierwith low outputresistance2 Applications Switchingregulatorsof any polarity Transformer-coupledDC-DCconverters3 DescriptionTheUCx84xseriesof controlintegratedcircuitsprovidethe featuresthat are necessaryto implementoff-lineor DC-to-DCfixed-frequencycurrent-modecontr olschemes,with a minimumnumberof undervoltagelockout(UVLO),featuringastar t-upcurrentof lessthan1 mA,and a precisionreferencetrimmedfor accuracyat the ensurelatchedoper
output of the on-chip driver stage intended to directly drive a MOSFET. Peak currents of up to 1 A are sourced and sunk by this pin. OUTPUT is actively held low when VCC is below the turnon threshold. RT/CT 4 7 10 I/O Fixed frequency oscillator set point. Connect timing resistor, RRT, to VREF and timing capacitor, CCT, to GROUND from this pin ...
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