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powerint 公司的linkswitch-ph系列集成了725v功率mosfet,连续模式pwm控制器,用于自偏置的高压开关电流源,频率抖动,逐个周期的电流限制以及延迟热关断电路,大大地简化pf大于0.9, triac调光的led驱动器的设计,主要用在离线led驱动器.本文介绍了linkswitch-ph系列主要特性,功能方框图, triac调光14w 和7w led驱动器电路图,以及triac调光14w led驱动器参考设计主要指标,电路图和材料清单(bom).the linkswitch-ph dramatically simplifies implementation of led drivers requiring pf >0.9, triac dimmer capability and high efficiency. the single-stage pf and constant current controller eliminates passive circuitry required for power factor correction and electrolytic bulk capacitor. the advanced primary-side control techniques used by the linkswitch-ph device provide accurate constant current control while eliminating the need for an optocoupler and secondary-side current control circuitry.linkswitch-ph incorporates a 725 v power mosfet, a continuous-mode pwm controller, a high voltage switched current source for self biasing, frequency jittering, cycle-by-cycle current limit and hysteretic thermal shutdown circuitry, all in a monolithic ic. linkswitch-ph系列主要特性: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 control circuitry? eliminates all control loop compensation circuitry? simple primary-side pwm dimming interface? universal input voltage range? enables designs that are electrolytic-freeaccurate and consistent performance? compensates for transformer inductance tolerances? compensates for line input voltage variations? frequency jittering greatly reduces emi filter size and costsadvanced protection and safety features? auto-restart for short-circuit protection? open circuit fault detection mode? automatic thermal shutdown restart with hysteresis? meets high vo