Transcription of UCx84x Current-Mode PWM Controllers
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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
5-V reference voltage. VREF is used to provide charging current to the oscillator timing capacitor through the timing resistor. It is important for reference stability that VREF is bypassed to GROUND with a ceramic capacitor connected as close to the pin as possible. A minimum value of 0.1-µF ceramic is required. Additional VREF
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