NCP1280 Datasheet - ON

NCP1280 Active Clamp Voltage Mode PWM Controller

Pin Name 1 Vin 2 NC 3 UV/OV 4 FF 5 CS 6 CSKIP 7 RT 8 DCMAX 9 SS 10 VEA 11 VREF 12 tD 13 OUT2 14 GND 15 OUT1 16 VAUX NCP1280 Application Information This pin is connected to the input voltage of the system. The voltage can be a rectified, filtered line voltage or output of a power factor correction .

NCP1280 Active Clamp Voltage Mode PWM Controller for Off-Line Applications The NCP1280 provides a highly integrated solution for off line power supplies requiring high efficiency and low parts count. This voltage mode controller provides control outputs for driving a forward converter primary MOSFET and an auxiliary MOSFET for active clamp circuit. The second output with its programmable delay can also be used for driving a synchronous rectifier on the secondary or for asymmetr.

NCP1280 Features

* such as line UV/OV protection, soft

* start, single resistor programmable (high) frequency oscillator, line voltage feedforward, dual mode overcurrent protection and maximum duty cycle control, allow converter optimization at minimal cost. Compared to a traditional forward converter, an NCP128

NCP1280_ONSemiconductor.pdf