Intersil公司的 ISL6726是適用于有源箝位正向轉(zhuǎn)換器拓撲的單端PWM控制器,典型起動電流125uA,,可調(diào)整峰值和平均限流保護,,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,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