Powerint LNK403-409EG带TRIAC调光LED驱动方案
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15W TRIAC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 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.
LNK403-409EG产品亮点：
Dramatically Simplifies Off-line LED Drivers
• Flicker-free phase-controlled TRIAC dimming
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