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powerint 公司的linkswitch-ph系列lnk403-409eg集成了725v功率mosfet，连续模式pwm控制器，用于自偏压的高压开关电流源，频率抖动，逐个周期的电流限制和延迟热关断电路，主要用在离线led驱动器。本文首先介绍了lnk403-409eg主要特性，功能方框图，以及triac调光和无调光的led驱动电路图。

接着介绍了采用lnk403-409eg的15wtriac调光单级pfc led驱动器参考设计技术指标，电路图和材料清单与变压器电路图。the linkswitch-ph dramatically simplifies implementation of leddrivers requiring pf >0.9， triac dimmer capability and highefficiency. the single-stage pf and constant current controllereliminates passive circuitry required for power factor correctionand electrolytic bulk capacitor. the advanced primary-side controltechniques used by the linkswitch-ph device provide accurateconstant current control while eliminating the need for anoptocoupler and secondary-side current control circuitry.linkswitch-ph incorporates a 725 v power mosfet， a continuous-modepwm controller， a high voltage switched current source for selfbiasing， frequency jittering， cycle-by-cycle current limit andhysteretic thermal shutdown circuitry， all in a monolithic ic.lnk403-409eg产品亮点：dramatically simplifies off-line led drivers? flicker-free phase-controlled triac dimming? single stage power factor corrected and accurate constant current(cc) output? eliminates optocoupler and all secondary current controlcircuitry? eliminates all control loop compensation circuitry? simple primary-side pwm dimming interface? universal input voltage range? enables designs that are electrolytic-freeaccurate and