欢迎光临格烁照明官方网站!
十年品牌 值得信赖!
全国咨询电话:15322427999
当前位置:首页 > LED封装技术

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

文章出处:8gled.com作者:格烁光电发表时间:2018-07-23
郑州代孕-孕前频道HEM8【专业实力保证】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

LNK403-409 family is optimized for flicker-free operation in TRIAC dimming applications

Single stage power factor corrected and accurate constant current (CC) output

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

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 restart with hysteresis

Meets high voltage creepage requirement 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, >85% achievable

Green Package

Halogen free and ROHS compliant package

LinkSwitch-PH系列应用:

Off-line LED driver

图1.LinkSwitch-PH系列方框图

图2.绝缘TRIAC调光高功率因素通用输入14W LED驱动器

图3.绝缘不调光高功率因素通用输入7W LED驱动器

采用LinkSwitchTM-PH LNK405EG的非绝缘12W降压LED驱动器参考设计

The document describes a non-isolated, power-factor corrected, low THD, high efficiency LED driver designed to drive an LED string with a nominal voltage of 36 V at a current of 330 mA from an input voltage range of 90 VAC to 265 VAC. It is designed to fit inside a T8 tube fixture.

The LinkSwitch-PH has been developed to cost effectively design a single-stage power factor corrected LED driver with primary-side constant current control. The LinkSwitch-PH controller was optimized for LED driver applications with minimal external parts count and control of the output current through the LED load without the use of an optocoupler.

The LinkSwitch-PH monolithically integrates the 725 V power MOSFET and controller.

The controller consists of an oscillator, PWM, 6 V regulator, BYPASS pin programming fun天津代孕-【孕宝宝马上到来Plv9】母乳频道ctions, over-temperature protection, frequency jittering, cycle-by-cycle current limit, leading edge blanking, and charge controller for output CC (constant-current) control.

The LinkSwitch-PH also provides a sophisticated range of protection features including auto-restart for control loop open/short faults and output short-circuit conditions. Accurate hysteretic thermal shutdown ensures safe average PCB temperatures under all conditions.

The non-isolated power factor corrected buck presented in this report shows how LinkSwitch-PH dramatically simplifies off-line, high-efficiency, power factor corrected LED driver design with very low parts count.

This document contains the LED driver specification, schematic, PCB diagram, bill of materials, conducted EMI measurements, thermal measurements, power line transient tests, inductor documentation and typical performance characteristics.

12W降压LED驱动器参考设计主要特性:

Dramatically simplifies off-line, power factor corrected, LED driver design

Single-stage, power factor corrected, non-isolated LED driver

Compact with extremely low component count

High power factor >0.9 across line and load

Very high efficiency >85%, 87% typical

Low THD, <20% at 230 VAC

No output current sensing required

Advanced performance features

Compensates for inductance tolerance

Compensates for input voltage variations

Compensates for output voltage variations

Frequency jittering greatly reduces EMI filter costs

Advanced protection and safety features

Auto-restart protection for short-circuit

Hysteretic thermal shutdown


图4.12W降压LED驱动器参考设计外形图
参考设计电源指标:


图5.参考设计电路图
参考设计材料清单(BOM):

可选OVP 电路材料清单:

参考设计机械元器件清单:


郑州代孕-孕前频道HEM8【专业实力保证】 Powerint LNK405EG RDR257 12W降压LED驱动器参考设计原创编辑请注明出来http://m.sh-keer.com

排行榜

最新资讯文章