Powerint LNK405EG RDR257 12W降压LED驱动器参考设计

Powerint公司的非绝缘12W降压LED驱动器参考设计RDR257是采用LinkSwitch-PH系列LNK405EG器件,极大地简化离线PFC LED驱动器的设计,外接元件极少,功率因素大于0.9.具有非常高的大于85%的效率,在230VAC时的THD小于20%,不需要输出电流检测.本文介绍了LinkSwitch-PH系列产品的亮点,功能方框图, 绝缘TRIAC调光高功率因素通用输入14W LED驱动器和绝缘不调光高功率因素通用输入7W LED驱动器,12W降压LED驱动器参考设计RDR257主要特胸,电路图和材料清单.

The LinkSwitch-PH dramatically simplifies implementation of LED drivers requiring PF >0.9, TRIAC dimmer capability (LNK403-409) 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系列产品亮点:

Dramatically Simplifies Off-line LED Drivers
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