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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 •  rogrammable 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 • rogrammable Slope Compensation•Supports N- and P-Channel Active Clamp FETs • rogrammable Switch Timing Between Main and Active Clamp Outputs• rogrammable Undervoltage Lock-Out (UV)•Input Voltage Dependent Duty Cycle Clamp •ENABLE Input with Low Power Disable •Internal Over-Temperature Protection • b-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 |
