關鍵詞： Powerint , LNK419EG , LED照明

Powerint公司的LinkSwitchTM-PH系列是LED驅(qū)動器系列,單級PFC,初級恒流控制,可選擇TRIAC調(diào)光/不調(diào)光,不需要光耦和電流檢測電路.器件集成了725V功率FET,連續(xù)模式PWM控制器,用于自偏壓的高壓開關電流源,頻率抖動和保護電路,從大局出發(fā)大大簡化了離線LED驅(qū)動器,主要用于離線LED驅(qū)動器.本文介紹了LinkSwitch-PH系列產(chǎn)品亮點,方框圖,14W和7W LED驅(qū)動電路圖,以及采用LNK419EG的40.5W街燈LED照明電路參考設計主要特性和指標,電路圖,材料清單和PCB元件布局圖.

The LinkSwitch-PH dramatically simplifies implementation of LED drivers requiring long lifetime, high efficiency, PF >0.9, and TRIAC dimming capability (LNK403-410). The single-stage combined power factor and constant-current controller eliminates a switching stage and the electrolytic bulk capacitor. The advanced primary-side control used by the LinkSwitch-PH device provides accurate constant current control while eliminating the need for an optocoupler and current sensing circuits.

LinkSwitch-PH incorporates a 725 V power FET, a continuous-mode PWM controller, a high-voltage switched current source for self biasing, frequency jittering, protection circuitry including cycle-by-cycle current limit and hysteretic thermal shutdown.

LinkSwitch-PH系列產(chǎn)品亮點:

Dramatically Simplifies Off-line LED Drivers

• Single-stage combination of power factor correction and accurate constant-current (CC) output

• Enables very long lifetime designs (no electrolytic capacitors)

• Eliminates optocoupler and all secondary current control circuitry

• Eliminates control loop compensation circuitry

• Simple primary-side PWM dimming interface

• Universal input voltage range

• LNK403-410 optimized for flicker-free TRIAC dimming EcoSmart™ – Energy Efficient

• Single-stage PFC combined with output CC control

• Greatly increases efficiency, >90% achievable

• Reduces component count

• No current sense resistors

• Low standby power remote ON/OFF feature (<50 mW at 230 VAC)

Accurate and Consistent Performance

• Compensates for transformer inductance variations

• Compensates for line input voltage variation

• Frequency jittering greatly reduces EMI filter size and cost

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

Green Package

• Halogen free and ROHS compliant package

LinkSwitch-PH系列應用:

• Off-line LED driver

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圖1.LinkSwitch-PH系列方框圖

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圖2.LinkSwitch-PH系列通用輸入TRIAC調(diào)光14W LED驅(qū)動電路圖

2012-8-29 11:53:23 上傳

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圖3.LinkSwitch-PH系列通用輸入無調(diào)光7W LED驅(qū)動電路圖

采用LinkSwitchTM-PH LNK419EG的40.5W功率因素大于0.95的非隔離降壓LED驅(qū)動器參考設計

The document describes a non-isolated high power factor (PF) LED driver designed to drive a nominal LED string voltage of 54 V at 750 mA from an input voltage range of 90 VAC to 300 VAC. The LED driver utilizes the LNK419EG from the LinkSwitch-PH family of ICs.

The topology is a single-stage non-isolated buck converter that meets the high efficiency requirements for this design. Good line and load output current regulation is achieved by directly sensing the output current and using shunt regulator for closed-loop feedback control.

High power factor and low THD is achieved by employing the LinkSwitch-PH IC which also provides a sophisticated range of protection features including auto-restart to prevent damage in the event of open control loop or during output short-circuit. Line overvoltage protection provides extended line fault and surge withstand. Output overvoltage protects the supply should the load be disconnected. Accurate hysteretic thermal shutdown ensures safe PCB temperatures under all conditions.

This document contains the LED driver specification, schematic, PCB diagram, bill of materials, transformer documentation and typical performance characteristics.

40.5W LED驅(qū)動器主要特性:

 Highly energy efficient

 >88% at 230 VAC

 >87% at 120 VAC

 <2% line and load regulation

 <5% IOUT tolerance

 Low cost, low component count and small, single-sided printed circuit board

 Frequency jitter allows smaller, lower cost EMI filter

 Integrated protection and reliability features

 Output open circuit / output short-circuit protected with auto-recovery

 Line input overvoltage shutdown extends voltage withstand during line faults

 Auto-recovering thermal shutdown with large hysteresis protects both components and printed circuit board

 IEC 61000-4-5, IEC 61000-3-2 Class C, and EN55015 B conducted EMI compliant

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