ISL6742

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 Deadtime 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
• Multi-Pulse Suppression
• Internal Over Temperature Protection
• Pb-free and ELV, WEEE, RoHS Compliant




Application

• Half-Bridge, Full-Bridge, Interleaved Forward, and Push-Pull Converters
• Telecom and Datacom Power
• Wireless Base Station Power
• File Server Power
• Industrial Power Systems




Pinout






Specifications

Supply Voltage, VDD . . . . . . . .. . . . . . . . . . . . . . . GND - 0.3V to +20.0V
OUTxx . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . GND - 0.3V to VDD
Signal Pins. . . . . . . . . . . . . . . . . . .. . . .. . . . .GND - 0.3V to V_REF + 0.3V
VREF . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . GND - 0.3V to 6.0V
Peak GATE Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.1A
ESD Classification
Human Body Model (Per MIL-STD-883 Method 3015.7) . . . . . . .2000V
Charged Device Model (Per EOS/ESD DS5.3, 4/14/93) . . . . .. . .1000V




Description

The ISL6742 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 ISL6742 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 whichvirtually 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 deadtime control, and short propagation delays. Additionally, Multi-Pulse Suppression ensures alternating output pulses at low duty cycles where pulse skipping may occur.