The ISL6744A is a low cost, primary side, double-ended

controller intended for applications using full and half-bridge

topologies for unregulated DC/DC converters. It is a voltagemode PWM controller designed for half-bridge and fullbridge power supplies. It provides precise control of

switching frequency, adjustable soft-start, precise deadtime

control with deadtimes as low as 35ns, and overcurrent

shutdown. The ISL6744A is identical to the ISL6744, but is

optimized for higher noise environments.

Low start-up and operating currents allow for easy biasing in

both AC/DC and DC/DC applications. This advanced

BiCMOS design features low start-up and operating

currents, adjustable switching frequency up to 1MHz, 1A

FET drivers, and very low propagation delays for a fast

response to overcurrent faults.

Features

• Precision Duty Cycle and Deadtime Control

• 100µA Start-up Current

• Adjustable Delayed Overcurrent Shutdown and Restart

• Adjustable Oscillator Frequency Up to 2MHz

• 1A MOSFET Gate Drivers

• Adjustable Soft-Start

• Internal Over Temperature Protection

• 35ns Control to Output Propagation Delay

• Small Size and Minimal External Component Count

• Input Undervoltage Protection

• Pb-Free (RoHS Compliant)

Applications

• Telecom and Datacom Isolated Power

• DC Transformers

• Bus Converters