Intersil公司的 ISL6726是適用于有源箝位正向轉換器拓撲的單端PWM控制器，典型起動電流125uA，可調整峰值和平均限流保護，可調整軟起動和軟停止，具有精密的最大占空比和死區(qū)控制，內置超溫保護，主要用在通信電源，AC/DC轉換器以及電池充電器。本文介紹了ISL6726主要特性，方框圖和典型應用電路。
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.
ISL6726主要特性：
• 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)
ISL6726應用：
• Telecom and Datacom Power Supplies
• AC/DC Power Supplies
• Battery Chargers
圖1。ISL6726方框圖
圖2。ISL6726典型應用電路：同步整流有源箝位正向
圖3。ISL6726典型應用電路：二極管整流有源箝位正向
詳情請見：
http://www.intersil.com/data/fn/fn7654.pdf
