ZVS Full Bridge PWM Controller

The ISL6551 is a zero voltage switching (ZVS) full-bridge PWM controller designed for isolated power systems. This part implements a unique control algorithm for fixedfrequency ZVS current mode control, yielding high efficiency with low EMI. The two lower drivers are PWM-controlled on the trailing edge and employ resonant delay while the two upper drivers are driven at a fixed 50 duty cycle.

Features

? High Speed PWM (up to 1MHz) for ZVS Full Bridge Control

? Current Mode Control Compatible

? High Current High-Side and Low-Side Totem-Pole Drivers

? Adjustable Resonant Delay for ZVS

? 10MHz Error Amplifier Bandwidth

? Programmable Soft-Start

? Precision Bandgap Reference

? Latching Shutdown Input

? Non-latching Enable Input

? Adjustable Leading Edge Blanking

? Adjustable Dead Time Control

? Adjustable Ramp for Slope Compensation

? Fast Short-Circuit Protection (Hiccup Mode)

? Adjustable Cycle-by-Cycle Peak Current Limiting

? Drive Signals to Implement Synchronous Rectification

? VDD Under-voltage Lockout

? Current Share Support

? ±5 “In Regulation” Indication

? QFN Package:

- Compliant to JEDEC PUB95 MO-220 QFN - Quad Flat

No Leads - Package Outline

- Near Chip Scale Package footprint, which improves

PCB efficiency and has a thinner profile

? Pb-Free Plus Anneal Available (RoHS Compliant)

Applications

? Full-Bridge and Push-Pull Converters

? Power Supplies for Off-line and Telecom/Datacom

? Power Supplies for High End Microprocessors and Servers