LNK403-409EG设计的带TRIAC调光LED驱动技术.docxVIP

LNK403-409EG 设计的带 TRIAC 调光 LED 驱动技术 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。 LinkSwitch-PH 系歹^ LNK403-409EG 是 Powerint 公司的集成了 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。 LNK403-409EG 产品亮点： Dramatically Simplifies Off-line LED Drivers Flickerfree phase-controlled TRIAC dimming Single stage power factor corrected and accurate constant current CC output Eliminates optocoupler and all secondary currentcontrol circuitry Eliminates all control loop compensation circuitry Simple primaryside PWM dimming interface niversal input voltage range Enables designs that are electrolyticfree Accurate and Consistent Performance Compensates for transform? inductance tolerances Compensates for line input voltage variations Fre uency ittering greatly reduces EMI filter size and costs Advanced Protection and Safety Features Autorestart for short-circuit protection Open circuit fault detection mode Automatic thermal shutdown restart with hysteresis Meets high voltage creepage re uirement between DRAIN and all other signal pins both on PCB and at package EcoSmart? Energy Efficient Low standby power remote ON OFF feature 50 mW at 230 VAC No current sense resistors maximizes efficiency High efficiency operation 5 achievable Green Package Halogen free and ROHS compliant package LNK403-409EG 应用： Offline LED driver G图1。LNK403-409EG功能方框图图2。隔离TRIAC调光通用输入14W LED驱动器电路图图3 G 图1。LNK403-409EG功能方框图 图2。隔离TRIAC调光通用输入14W LED驱动器电路图 图3。隔离不调光通用输入7W LED驱动器电路图 o- KtliKC 蚓月耻■周 HFEMIKCR O- IEOCi* TRL z~[4- JTu 丽小而 areg '嘤整R L?V LM 城林E 采用LNK403-409EG的TRIAC调光单级PFC LED驱动器参考设计 The document describes a power factor corrected LED driver designed to drive a nominal LED string voltage of 50 V at 0.3 A from an input voltage range of 90 VAC to 265 VAC. The LED driver uses the LNK406EG from the LinkSwitch-PH family by Power Integrations. LinkSwitch-PH ICs allow the implementation of cost effective and low co