UC3868N

谐振模式电源控制器 Resonant-Mode Power Supply Controllers

DESCRIPON

The UC1861-1868 family of ICs is optimized for the control of Zero Current Switched and Zero Voltage Switched quasi-resonant converters. Differences between members of this device family result from the various combinations of UVLO thresholds and output options. Additionally, the one-shot pulse steering logic is configured to program either on-time for ZCS systems UC1865-1868, or off-time for ZVS applications UC1861-1864.

FEATURES

•Controls Zero Current Switched ZCS or Zero Voltage Switched ZVS Quasi-Resonant Converters

•Zero-Crossing Terminated One-Shot Timer

•Precision 1%, Soft-Started 5V Reference

•Programmable Restart Delay Following Fault

•Voltage-Controlled Oscillator VCO with Programmable Minimum and Maximum Frequencies from 10kHz to 1MHz

•Low Start-Up Current 150µA typical

•Dual 1 Amp Peak FET Drivers

•UVLO Option for Off-Line or DC/DC Applications