The ISL6726 is a highly featured single-ended PWM controller

intended for applications using the active clamp forward

converter topology in either n- or p-channel active clamp

configurations, the asymmetric half-bridge topology, and the

standard forward topologies with synchronous rectification. It is a

current-mode PWM controller with many features designed to

simplify its use. Among its many features are a precision

oscillator which allows accurate control of the deadtime and

maximum duty cycle, bi-directional synchronization with 180°

phase shift for interleaving applications, adjustable soft-start and

soft-stop, a low power disable mode, and average current limit

for “brick-wall” overcurrent protection.

This advanced BiCMOS design features low start-up and

operating currents, adjustable switching frequency to greater

than 1MHz, high current FET drivers, and very low propagation

delays for a fast response to overcurrent faults.

Features

• Precision Maximum Duty Cycle and Deadtime Control

• 125µA Typical Start-up Current

• Adjustable Peak and Average Current Limit Protection

• Programmable Oscillator Frequency

• Bi-Directional Synchronization with 180° Phase Shift for

Interleaved Converter Applications

• Adjustable Soft-Start and Selectable Soft-Stop

• Selectable Minimum Duty Cycle Clamp for Synchronous

Rectifier Applications

• Programmable Slope Compensation

• Supports N- and P-Channel Active Clamp FETs

• Programmable Switch Timing Between Main and Active Clamp

Outputs

• Programmable Undervoltage Lock-Out (UV)

• Input Voltage Dependent Duty Cycle Clamp

• ENABLE Input with Low Power Disable

• Internal Over-Temperature Protection

• Pb-Free (RoHS Compliant)

Applications

• Telecom and Datacom Power Supplies

• AC/DC Power Supplies

• Battery Chargers