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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