Especificações Técnicas

THIS COMBINATION IC INTEGRATES POWER FACTOR CORRECTION (PFC) AND QUASI-RESONANT FLYBACK ALITY NECESSARY TO IMPLEMENT A COMPACT AND HIGHLY EFFICIENT SWITCHED MODE POWER SUPPLY FOR AN ADAPTER APPLICATION. THE PFC STAGE EXHIBITS NEAR-UNITY POWER FACTOR OPERATING IN A CRITICAL CONDUCTION MODE (CRM) WITH A MAXIMUM FREQUENCY CLAMP. THE CIRCUIT INCORPORATES ALL THE FEATURES NECESSARY FOR BUILDING A ROBUST AND COMPACT PFC STAGE MINIMIZING THE NUMBER OF EXTERNAL COMPONENTS.   THE QUASI-RESONANT CURRENT-MODE FLYBACK STAGE FEATURES A PROPRIETARY VALLEY-LOCKOUT CIRCUITRY, ENSURING STABLE VALLEY SWITCHING. THIS SYSTEM WORKS DOWN TO THE 4TH VALLEY AND TOGGLES TO A FREQUENCY FOLDBACK MODE WITH A MINIMUM FREQUENCY CLAMP BEYOND THE 4TH VALLEY TO ELIMINATE AUDIBLE NOISE. SKIP MODE OPERATION ALLOWS EXCELLENT EFFICIENCY IN LIGHT LOAD CONDITIONS CONSUMING VERY LOW STANDBY POWER CONSUMPTION.     COMMON GENERAL FEATURES - WIDE VCC RANGE FROM 9 V TO 30 V WITH BUILT-IN OVERVOLTAGE PROTECTION - HIGH-VOLTAGE STARTUP CIRCUIT AND ACTIVE INPUT FILTER CAPACITOR DISCHARGE CIRCUITRY FOR REDUCED STANDBY POWER - INTEGRATED HIGH-VOLTAGE BROWN-OUT DETECTOR - INTEGRATED HIGH-VOLTAGE SWITCH DISCONNECTS PFC FEEDBACK RESISTOR DIVIDER TO REDUCE STANDBY POWER - FAULT INPUT FOR SEVERE FAULT CONDITIONS, NTC COMPATIBLE (LATCH AND AUTO-RECOVERY OPTIONS) - 0.5 A / 0.8 A SOURCE / SINK GATE DRIVERS - INTERNAL TEMPERATURE SHUTDOWN - POWER SAVINGS MODE REDUCES SUPPLY CURRENT CONSUMPTION TO 70 A ENABLING VERY LOW INPUT POWER   APPLICATIONS:  - PFC CONTROLLER FEATURES - CRITICAL CONDUCTION MODE WITH CONSTANT ON TIME CONTROL (VOLTAGE MODE) AND MAXIMUM FREQUENCY CLAMP - ACCURATE OVERVOLTAGE PROTECTION - BI-LEVEL LINE-DEPENDENT OUTPUT VOLTAGE - FAST LINE / LOAD TRANSIENT COMPENSATION - BOOST DIODE SHORT-CIRCUIT PROTECTION - FEED-FORWARD FOR IMPROVED OPERATION ACROSS LINE AND LOAD - ADJUSTABLE PFC DISABLE THRESHOLD BASED ON OUTPUT POWER QR FLYBACK CONTROLLER FEATURES - VALLEY SWITCHING OPERATION WITH VALLEY-LOCKOUT FOR NOISE-FREE OPERATION - FREQUENCY FOLDBACK WITH MINIMUM FREQUENCY CLAMP FOR HIGHEST PERFORMANCE IN STANDBY MODE - MINIMUM FREQUENCY CLAMP ELIMINATES AUDIBLE NOISE - TIMER-BASED OVERLOAD PROTECTION (LATCHED OR AUTO-RECOVERY OPTIONS) - ADJUSTABLE OVERPOWER PROTECTION - WINDING AND OUTPUT DIODE SHORT-CIRCUIT PROTECTION - 4 MS SOFT-START TIMER NCP1937A2G COMBINATION PFC QUASIRESONANT FLYBACK CONTROLLER MAIORES DETALHES DE NCP1937A2G NO SITE DO FABRICANTE: HTTPS://WWW.ONSEMI.COM/PDF/DATASHEET/NCP1937-D.PDF TAGS DE NCP1937A2G: NCP1937A2DR2G, NCP1937A2G, NCP1937A, NCP1937, NCP 1937A2G, CI PFC, CI CONTROLADOR PFC, PFC IC, COMBINATION POWER FACTOR CORRECTION AND QUASIRESONANT FLYBACK CONTROLLERS FOR ADAPTERS, CI PFC DE FONTE ATX, CI PFC ATX, CI DA FONTE JBL BOOMBO, CI FONTE BOOMBOX, CI PWM BOOMBOX, CI PWM FONTE BOOMBOX

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