ISL6752-数据手册.pdf

ISL6752 ® Data Sheet March 10, 2005 FN9181.1 ZVS Full-Bridge Current-Mode PWM with Features Adjustable Synchronous Rectifier Control • Adjustable Resonant Delay for ZVS Operation The ISL6752 is a high-performance, low-pin-count • Synchronous Rectifier Control Outputs with Adjustable alternative zero-voltage switching (ZVS) full-bridge PWM Delay/Advance controller. Like Intersil’s ISL6551, it achieves ZVS operation by driving the upper bridge FETs at a fixed 50% duty cycle • Current-Mode Control while the lower bridge FETs are trailing-edge modulated with • 3% Current Limit Threshold adjustable resonant switching delays. Compared to the more • Adjustable Deadtime Control familiar phase-shifted control method, this algorithm offers equivalent efficiency and improved overcurrent and light- • 175µA Startup Current load performance with less complexity in a lower pin count • Supply UVLO package. • Adjustable Oscillator Frequency Up to 2MHz The ISL6752 features complemented PWM outputs for synchronous rectifier (SR) control. The complemented • Internal Over Temperature Protection outputs may be dynamically advanced or delayed rela