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 accur
• Switching regulators of any polarity • Transformer-coupled DC-DC converters 3 Description The UCx84x series of control integrated circuits provide the features that are necessary to implement off-line or DC-to-DC fixed-frequency current-mode control schemes, with a minimum number of external components. The internally implemented circuits
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