NCP1351APG ON Semiconductor

NCP1351 Variable Off Time PWM Controller The NCP1351 is a current-mode controller targeting low power off-line flyback Switched Mode Power Supplies (SMPS) where cost is of utmost importance. Based on a fixed peak current technique NCP1351 V OUT + NCP1351 LATCH + 85-265VAC 1 8 *OPP 2 7 3 6 4 5 + GND *Optional Figure 1. Typical Application Circuit PIN FUNCTION DESCRIPTION Pin N Pin Name Function Pin Description 1 FB Feedback Input Injecting Current in this Pin Reduces Frequency 2 Ct Oscillator Frequency A capacitor sets the maximum switching frequency at no feedback current 3 CS Current Sense Input Senses the Primary Current 4 GND 5 DRV Driver Output Driving Pulses to the Power MOSFET 6 V Supply Input Supplies the controller up to 28 V CC 7 Latch Latchoff Input A positive voltage above V fully latches off the controller LATCH 8 Timer Fault Timer Capacitor Sets the time duration before fault validation OVERCURRENT PROTECTION ON NCP1351 VERSIONS: NCP1351 Auto-recovery Latched Dual level A x B x C x x D x x