Intersil公司的 ISL6726是適用于有源箝位正向轉(zhuǎn)換器拓?fù)涞膯味?a class="innerlink" href="http://theprogrammingfactory.com/tags/PWM" title="PWM" target="_blank">PWM控制器，典型起動電流125uA，可調(diào)整峰值和平均限流保護(hù)，可調(diào)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(nèi)置超溫保護(hù)，主要用在通信電源，AC/DC轉(zhuǎn)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(yīng)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(yīng)用：

• Telecom and Datacom Power Supplies

• AC/DC Power Supplies

• Battery Chargers

圖1。ISL6726方框圖

圖2。ISL6726典型應(yīng)用電路：同步整流有源箝位正向

圖3。ISL6726典型應(yīng)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