The ISL6744 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.
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 Plus Anneal Available (RoHS Compliant)

Applications
• Telecom and Datacom Isolated Power
• DC Transformers
• Bus Converters