Powerint LNK420EG 75W LED驱动解决方案(RD－290)

Powerint公司的LinkSwitch-PH系列是单级PFC初级边恒流控制和调光/不调光选择的LED驱动器,高效率,PF大于0.9.器件集成了725V功率FET,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,包括逐个周期限流和滞后的热关断等在内的保护电路.主要用在离线LED驱动器.本文介绍了LinkSwitch-PH系列产品亮点,方框图,7W和14W LED驱动电路图,以及采用LNK420EG的效率大于92%的75W PFC LED驱动器参考设计主要指标,特性和电路图,材料清单和PCB布局图.
LNK403－410/413－420
LinkSwitch-PH LED Driver IC Family
Single-Stage PFC, Primary-Side Constant Current Control and TRIAC Dimming/Non-Dimming Options
The LinkSwitch-PH dramatically simplifies implementation of LED drivers requiring long lifetime, high efficiency, PF >0.9, and TRIAC dimming capability (LNK403-410). The single-stage combined power factor and constant-current controller eliminates a switching stage and the electrolytic bulk capacitor. The advanced primary-side control used by the LinkSwitch-PH device provides accurate constant current control while eliminating the need for an optocoupler and current sensing circuits.
LinkSwitch-PH incorporates a 725 V power FET, a continuous-mode PWM controller, a high-voltage switched current source for self biasing, frequency jittering, protection circuitry including cycle-by-cycle current limit and hysteretic thermal shutdown.
 
Product Highlights
Dramatically Simplifies Off-line LED Drivers
• Single-stage combination of power factor correction and accurate constant-current (CC) output
• Enables very long lifetime designs (no electrolytic capacitors)
• Eliminates optocoupler and all secondary current control circuitry
• Eliminates control loop compensation circuitry
• Simple primary-side PWM dimming interface
• Universal input voltage range
• LNK403-410 optimized for flicker-free TRIAC dimming
EcoSmart™ – Energy Efficient
• Single-stage PFC combined with output CC control
• Gr...