The ISL6754 is a high-performance extension of the Intersil

family of zero-voltage switching (ZVS) full-bridge PWM

controllers. Like the ISL6752, 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.

Adding to the ISL6752’s feature set are average current

monitoring and soft-start. The average current signal may be

used for average current limiting, current sharing circuits and

average current mode control. Additionally, the ISL6754

supports both voltage- and current-mode control.

The ISL6754 features complemented PWM outputs for

synchronous rectifier (SR) control. The complemented

outputs may be dynamically advanced or delayed relative to

the PWM outputs using an external control voltage.

This advanced BiCMOS design features precision deadtime

and resonant delay control, and an oscillator adjustable to

2MHz operating frequency. Additionally, Multi-Pulse

Suppression ensures alternating output pulses at low duty

cycles where pulse skipping may occur.

Features

• Adjustable Resonant Delay for ZVS Operation

• Synchronous Rectifier Control Outputs with Adjustable

Delay/Advance

• Voltage- or Current-Mode Control

• 3 Current Limit Threshold

• Adjustable Average Current Limit

• Adjustable Deadtime Control

• 175µA Start-up Current

• Supply UVLO

• Adjustable Oscillator Frequency Up to 2MHz

• Internal Over-Temperature Protection

• Buffered Oscillator Sawtooth Output

• Fast Current Sense to Output Delay

• Adjustable Cycle-by-Cycle Peak Current Limit

• 70ns Leading Edge Blanking

• Multi-Pulse Suppression

• Pb-Free (RoHS Compliant)

Applications

• ZVS Full-Bridge Converters

• Telecom and Datacom Power

• Wireless Base Station Power

• File Server Power

• Industrial Power Systems