NCP1562A, NCP1562B PWM Controller, High Performance, Active Clamp / Reset The NCP1562x is a family of voltage mode controllers designed NCP1562A,NCP1562B 1 V AUX Disable V in I start 8 P.O.R. V I 5.0VReference inhibit AUX(on) -- Bias + V 16 REF -- Disable VREF V AUX OneShot C + AUX + 1V Pulse + S -- V / AUX(on) Dominant -- Central V / AUX(off1) Reset Q Logic V AUX(off2) Latch R V in Thermal V Soft--Stop Shutdown UV R1 2 Complete UVOV UVOV Enable Output R2 STOP V AUX Detector 15 OUT1 Clock S Q 14 V ref Dominant PGND Delay V AUX Reset Oscillator Logic 500 mA 13 R T Latch 6 DMAX Q OUT2 R CSKIP 3V SYNC Clock RTCT Comparator FF Reset 11 + Saturation 7 Comparator 2V -- V REF t D C + T SYNC + + R V D CSKIP -- V I REF CSKIP(C) -- 3.6V CSKIP -- 12 Not Control Saturated 20k CSKIP Logic C CSKIP 9 I Clock CSKIP(D) -- Ilimit + V EA Comparator V + X 270k -- PWM 0.2V= Aver. + Comparator -- (0.5V=Bver.) OUT 4 Not Soft--Start Saturated Comparator CS Fixed80nsLEB -- + Clock Enable V in Soft--Stop FF Complete + Comparator Soft--Start 0.2V R V FF REF -- + Soft--Stop -- 3 ControlLogic STOP + V X Soft--Start 10 3V I FF SS(C) -- C Complete FF SS C SS Enable Output I SS(D) FF Reset 5 GND Figure1.DetailedBlockDiagram