關鍵詞： LED驅動器 , LNK406EG , PAR30 , Powerint

Powerint公司的13.5W隔離的可調光的PFC LED驅動器采用LinkSwitchTM-PH系列的LNK406EG器件,輸入電壓185VAC到265VAC,輸出36V/425mA,可用于PAR30 / PAR38反射燈.本文介紹了LinkSwitch-PH系列LED驅動器主要特性,框圖,7W和14W LED驅動器電路圖以及用于PAR30 / PAR38的13.5W LED驅動器參考設計DER314主要特性和指標,電路圖和材料清單,變壓器電路圖和PCB布局圖.

The LinkSwitch-PH dramatically simplifies implementation of LED drivers requiring long lifetime, high efficiency, PF >0.9, and TRIAC dimming capability (LNK403-409). 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 LED驅動器主要特性:

Product Highlights

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

• LNK403-409 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應用:

• Off-line LED driver

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圖1. LinkSwitch-PH功能方框圖

2012-2-7 13:00:19 上傳

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圖2. LinkSwitch-PH應用電路圖:通用輸入隔離的TRIAC調光高PFC 14W LED驅動器

2012-2-7 13:00:19 上傳

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圖3. LinkSwitch-PH應用電路圖:通用輸入隔離的無調光高PFC 7W LED驅動器

用于PAR30 / PAR38的13.5W LED驅動器參考設計DER314

The document describes an isolated high power factor (PF) TRIAC dimmable LED driver designed to drive a nominal LED string voltage of 36 V at 425 mA from an input voltage range of 185 VAC to 265 VAC. The LED driver utilizes the LNK406EG from the LinkSwitch-PH family of ICs.

Key goals for this design were:

 Lowest cost

 Small size

 Efficiency

 Demonstration of (optional) thermal fold back (output current reduces above temperature threshold)

The topology used is a single-stage power factor corrected flyback that meets high efficiency, high power factor, low THD, isolation, low component count, and stringent space requirements for this design.

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 for open control loop and output short-circuit conditions. Line overvoltage provides extended line fault and surge withstand, and accurate hysteretic thermal shutdown that ensures safe average PCB temperatures under all conditions.

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

參考設計DER314主要特性:

 High efficiency, ≥87% at 230 VAC

 Low cost

 Single-stage converter

 Single sided PCB

 Low component count

 Enhanced user experience

 Flicker free, fast monotonic start-up (<300 ms) – no perceptible delay

 Broad dimmer compatibility

 Flicker-free

 Tested with common types from Australia, China, Korea and Germany

 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 ring wave, IEC 61000-3-2 C and EN55015 B conducted EMI compliant

2012-2-7 13:00:19 上傳

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