The ISL6753 is a high-performance, low-pin-count

alternative, zero-voltage switching (ZVS) full-bridge PWM

controller. Like the ISL6551, it achieves ZVS operation by

driving the upper bridge FETs at a fixed 50 duty cycle while

the lower bridge FETS are trailing-edge modulated with

adjustable resonant switching delays. Compared to the more

familiar phase-shifted control method, this algorithm offers

equivalent efficiency and improved overcurrent and lightload performance with less complexity in a lower pin count package.

This advanced BiCMOS design features low operating

current, adjustable oscillator frequency up to 2MHz,

adjustable soft-start, internal over temperature protection,

precision deadtime and resonant delay control, and short

propagation delays. Additionally, Multi-Pulse Suppression

ensures alternating output pulses at low duty cycles where

pulse skipping may occur.

Features

• Adjustable Resonant Delay for ZVS Operation

• Voltage- or Current-Mode Operation

• 3 Current Limit Threshold

• 175µA Startup Current

• Supply UVLO

• Adjustable Deadtime Control

• Adjustable Soft-Start

• Adjustable Oscillator Frequency Up to 2MHz

• Tight Tolerance Error Amplifier Reference Over Line,

Load, and Temperature

• 5MHz GBWP Error Amplifier

• Adjustable Cycle-by-Cycle Peak Current Limit

• Fast Current Sense to Output Delay

• 70ns Leading Edge Blanking

• Multi-Pulse Suppression

• Buffered Oscillator Sawtooth Output

• Internal Over Temperature Protection

• Pb-Free Plus Anneal Available and ELV, WEEE, RoHS Compliant

Applications

• ZVS Full-Bridge Converters

• Telecom and Datacom Power

• Wireless Base Station Power

• File Server Power

• Industrial Power Systems