Active Clamp Voltage Mode PWM Controller for Off-line Applications

Overview

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 asymmetric half bridge circuits.

Incorporation of high voltage start−up
circuitry (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.

  • Off−Line Power Converters in 100−500 W Range
  • Desktop Power Supplies (High−End)
  • Industrial Power Supplies
  • Plasma/LCD TV Front−End

  • Internal High Voltage Start−Up Regulator (25 V to 700 V)
  • Dual Control Outputs with Adjustable Overlap Delay
  • Programmable Maximum Duty Cycle Control
  • Single Resistor Oscillator Frequency Setting
  • Fast Line Feedforward
  • Line Under/Overvoltage Lockout
  • Dual Mode Overcurrent Protection
  • Programmable Soft Start
  • Precision 5.0 V Reference
  • Pb-Free Package is Available*

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