The ISL6742B is a high-performance double-ended PWM

controller with advanced synchronous rectifier control and

current limit features. It is suitable for both current- and

voltage-mode control methods.

The ISL6742B includes complemented PWM outputs for

Synchronous Rectifier (SR) control. The complemented

outputs may be dynamically advanced or delayed relative to

the main outputs using an external control voltage.

Its advanced current sensing circuitry employs sample and

hold methods to provide a precise average current signal.

Suitable for average current limiting, a technique which

virtually eliminates the current tail-out common to peak

current limiting methods, it is also applicable to current

sharing circuits and average current mode control.

This advanced BiCMOS design features an adjustable oscillator

frequency up to 2MHz, internal over-temperature protection,

precision dead time control and short propagation delays.

Additionally, multipulse suppression ensures alternating output

pulses at low duty cycles where pulse skipping may occur.

Features

• Synchronous rectifier control outputs with adjustable

delay/advance

• Adjustable average current signal

• 3 tolerance cycle-by-cycle peak current limit

• Fast current sense to output delay

• Adjustable oscillator frequency up to 2MHz

• Adjustable dead time control

• Voltage- or current-mode operation

• Separate RAMP and CS inputs for voltage feed-forward or

current-mode applications

• Tight tolerance error amplifier reference over line, load, and

temperature

• 175µA start-up current

• Supply UVLO

• Adjustable soft-start

• 70ns leading edge blanking

• Multipulse suppression

• Internal over-temperature protection

• Pb-free (RoHS compliant)

Applications

• Half-bridge, full-bridge, interleaved forward, and push-pull

converters

• Telecom and datacom power

• Wireless base station power

• File server power

• Industrial power systems