NCP1379DR2G ON Semiconductor

NCP1379 Quasi-Resonant Current-Mode Controller for High-Power Universal Off-line Supplies NCP1379 TYPICAL APPLICATION EXAMPLE HV bulk Vout . GND NCP1379 ZCD / OPP 8 1 7 2 VCC 6 3 4 5 GND Figure 1. Typical Application Schematic PIN FUNCTION DESCRIPTION Pin N Pin Name Function Pin Description 1 ZCD Zero Crossing Detection Connected to the auxiliary winding, this pin detects the core reset Adjust the over power protection event. Also, injecting a negative voltage smaller than 0.3 V on this pin will perform over power protection. 2 FB Feedback pin Hooking an optocoupler collector to this pin will allow regulation. 3 CS Current sense This pin monitors the primary peak. 4 GND The controller ground 5 DRV Driver output The drivers output to an external MOSFET 6 V Supplies the controller This pin is connected to an external auxiliary voltage. CC 7 Fault Overvoltage protection This pin observes the HV rail and protects the circuit in case of low Brown out main conditions. It also offers a way to latch the circuit in case of over voltage event. 8 C Timing capacitor A capacitor connected to this pin acts as the timing capacitor in fold- T back mode.