關(guān)鍵詞： LED , LNK460VG , Powerint , 電源

Powerint公司的DER322參考設(shè)計(jì)采用LinkSwitch-PL系列LNK460VG器件，是業(yè)界首個(gè)可替代100W A19白熾燈的LED驅(qū)動(dòng)器，采用單層PCB，具有低成本少元件數(shù)和小尺寸特點(diǎn)，230VAC時(shí)的效率大于93%，PF大于0.9，230 VAC; 78 V LED時(shí)的THD小于20%，集成了包保護(hù)和可靠性特性，熱關(guān)斷自動(dòng)恢復(fù)。本文介紹了LinkSwitch-PL系列產(chǎn)品亮點(diǎn)，方框圖，典型應(yīng)用電路以及DER322參考設(shè)計(jì)主要特性和指標(biāo)，電路圖，材料清單和PCB布局圖。

The LinkSwitch-PL family enables a very small and low cost single-stage power factor corrected constant current driver for solid state lighting. Optimized for direct LED current sensing, the LinkSwitch-PL operates over a wide input voltage range delivering an output power of up to 16 W. The LinkSwitch-PL control algorithm provides flicker-free TRIAC dimming with minimal external components.

Each device incorporates a 725 V rated power MOSFET, a novel discontinuous mode variable frequency variable on-time controller, frequency jitter, cycle by cycle current limit and hysteretic thermal shutdown in a monolithic 4-pin IC, available in SO-8C, eSOP-12, and eDIP-12 packages.

LinkSwitch-PL系列產(chǎn)品亮點(diǎn)：

Dramatically Simplifies Off-line LED Drivers

• Flicker-free phase-controlled TRIAC dimming

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

• Very low component count with small non-electrolytic bulk capacitor for compact replacement lamp designs

• Compact SO8, eSOP, and eDIP packages

• Completely eliminates control loop compensation

Advanced Performance Features

• Optimized for non-isolated flyback designs

• Frequency jitter greatly reduces EMI filter size and costs

• Low dissipation direct sensing of LED current

Advanced Protection and Safety Features

• Cycle skipping regulation for abnormally low output power to clamp peak output current delivered

• 725 V integrated power MOSFET allows small bulk capacitance and maximizes power capability

• Short-circuit, overload, open feedback and output overvoltage protection

• Hysteretic thermal shutdown

• Meets high-voltage creepage between DRAIN and all other pins both on PCB and at package

EcoSmart™ - Energy Efficient

• High power factor optimizes system lumen per input VA

• Control algorithm balances switching and conduction losses over line and load to maintain optimum efficiency

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圖1。LinkSwitch-PL系列功能方框圖

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圖2。LinkSwitch-PL系列典型應(yīng)用電路圖

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圖3。采用LinkSwitch-PL系列的替代A19白熾燈的5W 15V LED驅(qū)動(dòng)器電路圖

DER322參考設(shè)計(jì)

High Efficiency (>93%), High Power Factor(>0.9), 18 W Output Non-Isolated Buck LED Driver Using LinkSwitchTM-PL LNK460VG

The document describes a non-isolated, high efficiency, high power factor (PF) LED driver designed to drive a nominal LED string voltage of 78 V at 230 mA from an input voltage range of 195 VAC to 265 VAC (47 Hz – 63 Hz). The LED driver utilizes the LNK460VG from the LinkSwitch-PL family of ICs.

The topology used is a single-stage non-isolated buck that meets the stringent space and efficiency requirements for this design. LinkSwitch-PL based designs provide high power factor (>0.9) meeting international requirements.

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

DER322參考設(shè)計(jì)主要特性：

 Single-stage power factor correction combined with constant current (CC) output

 Low cost, low component count, small size and single-sided PCB

 Highly energy efficient, >93% at 230 VAC input for 78 V LED Load

 Integrated protection and reliability features

 Single shot no-load protection / output short-circuit protected with auto-recovery

 Auto-recovering thermal shutdown with large hysteresis protects both components and PCB

 No damage during brown-out conditions

 PF >0.9 at 230 VAC

 % ATHD <20% at 230 VAC; 78 V LED

 Meets IEC ring wave, differential line surge and EN55015 conducted EMI

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