Active Clamp Voltage Mode PWM Controller For Off-line Applications

The NCP1280 provides a highly integrated solution for offline power supplies requiring highefficiency 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 asymmetric half bridge circuits. Incorporation of high voltage startupcircuitry (with 700 V capability) reduces parts count and system power dissipation. Additional 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 NCP1280 based converter CAN offer significant efficiency improvements and system cost savings.
By ON Semiconductor
NCP1280 's PackagesNCP1280 's pdf datasheet

NCP1280 Pinout, Pinouts
NCP1280 pinout,Pin out
This is one package pinout of NCP1280,If you need more pinouts please download NCP1280's pdf datasheet.

NCP1280 Application circuits
NCP1280 circuits
This is one application circuit of NCP1280,If you need more circuits,please download NCP1280's pdf datasheet.

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