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.

• Precision Duty Cycle and Deadtime Control
• 100µA Start-up Current
• Adjustable Delayed Overcurrent Shutdown and Re-Start
• 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)

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