功率电感生产厂家
联系我们
热门搜索
点击排行
推荐阅读
猜猜你喜欢的
技术知识 您所在的位置: 首页 > 技术知识

LNK403-409EG设计的带TRIAC调光LED驱动技术

来源:    作者:    发布时间:2015-04-10 10:51:17    浏览量:

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 系列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

• Flicker-free phase-controlled TRIAC dimming

• 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 t电感加工厂hermal 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

LNK403-409EG应用:

• Off-line LED driver

6.jpg

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
8.jpg

图3。隔离不调光通用输入7W LED驱动器电路图

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 component count LED drivers which meet both power factor and harmonics limits; and also offer an enhanced end user experience. This includes ultra-wide dimming range (not used in this demo), flicker free operation (even with low cost AC line TRIAC dimmers) and fast, clean turn on.

The topology used is an isolated flyback operating in continuous conduction mode. Output current regulation is sensed entirely from the primary side eliminating the need for secondary side feedback components. No external current sensing is required on the primary side either as this is performed inside the IC further reducing components and losses. The internal controller adjusts the MOSFET duty cycle to maintain a sinusoidal input current and therefore high power factor and low harmonic currents.

The LNK406EG also provides a sophisticated range of protection features including autorestart for open control loop and output short-circuit conditions. Line overvoltage provides extended line faul差模电感器t and surge withstand, output overvoltage protects the supply should the load be disconnect and accurate hysteretic thermal shutdown ensures safe average PCB temperatures under all conditions.

The key goals of this design were low profile an模压电感器d high efficiency. This was to allow the driver board to fit into the space behind t一体电感器he LED load board inside a T8 tube and operate with an acceptable temperature rise. This necessitated careful selection of components and mounting methods but was simpler than alternate solutions due to the low component count required for a primary side regulated LinkSwitch-PH design.

  • 80V浪涌吸收器原理与设计摘要 针对飞机直流电源上的浪涌干扰,分析了采用电压钳位和开关式稳压电路两种方法,实现80V浪涌吸收器的可行性。经过设计和试验,较好地解决了这一问题。关键词 机载电子设备;80V浪涌吸收器;浪涌干扰随着

  • 单片机的LED汉字条屏显示技术的工作原理综述 文中设计了一种基于单片机动态扫描控制的16x16LED汉字显示条屏,简单分析了汉字显示的原理,并对LED显示模块单元如何进行行列信号控制及信号传输中的驱动问题进行了研究。结果表明采用并行数据输入、串

  • CCFL推挽式缓冲电路无抑制时的漏极电压图1详细列出了使用15V直流电源工作时,推挽式驱动器的典型栅极驱动电压和漏极电压波形。在推挽式驱动结构中,当互补MOSFET开启时,正常情况下漏极电压会升至直流电源电压的两倍(或者本

  •