Powerint LNK417EG 15W离线LED驱动电源方案(DER284)

Powerint公司的LinkSwitch-PH系列大大地简化了实现功率因素大于0.9,TRIAC调光和高效率的LED驱动器的设计.器件集成了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,逐个周期限流和滞后热关断电路,最适合用于离线LED驱动器.本文介绍了LinkSwitch-PH系列产品亮点, 功能方框图, 14W和7W LED驱动器电路图,以及采用LNK417EG无电解电容高效率(≥90%) PFC大于0.9的15W LED驱动器参考设计电路图,主要指标和材料清单与PCB布局图.
LinkSwitch-PH dramatically simplifies implementation of LED drivers requiring Power Factors greater than 0.9, TRIAC dimming, and high efficiency. This highly integrated controller introduces a new control technique that provides very high power factor and accurate output current control, and eliminates passive circuitry required for power factor correction, optocoupler and secondary current control circuitry.
Each device incorporates a 725V 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 into a monolithic IC.
LinkSwitch-PH系列产品亮点:
Dramatically Simplifies Off-line LED Drivers
Single-stage power factor correction and accurate constant current (CC) output
Flicker-free, phase-controlled TRIAC dimming
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-free
Accurate and Consistent Performance
Fast start-up time
Compensates for transformer inductance tolerances
Compensates for line input voltage variations
Frequency jittering greatly reduces EMI filter size and costs
Advanced Protection and Safety Features
Auto-restart for short circuit protection
Open circuit fault detection mode
Automatic thermal shutdown or restart with hysteresis
Meets high voltage creepage req...