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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.

Key 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