Powerint LNK605DG 4.2W LED驱动方案

Powerint 公司的4.2W LED驱动方案是采用LNK605DG器件,输入电压为85–265VAC,输出电压为12V/350mA. 4.2W LED驱动方案初级采用恒压/恒流(CV/CC)控制器,从而省略了次级控制和光耦.输出电压精度±5%,输出电流精度±10%,包括火线电压,负载和温度补偿和元件误差.主要应用手机,无绳电话,PDA,MP3的充电器,适配器,LED驱动器等.本文介绍了LNK605DG的主要特性,应用案例和4.2W LED驱动方案设计电路图, PCB布局(61mm x 24mm)与材料清单.

Energy-Efficient, Accurate CV/CC Switcher 4.2W LED驱动器指标: 85–265 VAC Input; 12 V, 350 mA Output This engineering report describes the design for a universal input, 12 V, 350 mA CV/CC power supply for LED driver applications. This power supply utilizes the LNK605DG device from the Power Integrations LinkSwitch-II family.

This document contains the power supply and transformer specifications, schematics, bill of materials, and typical performance characteristics pertaining to this power supply.

4.2W LED驱动器特性:

Summary and Features

Accurate primary-side constant voltage/constant current (CV/CC) controller eliminates secondary side control and optocoupler

±5% output voltage and ±10% output current accuracy including line, load,temperature and component tolerance

No current-sense resistors for maximized efficiency

Low part-count solution for lower cost

Over-temperature protection–tight tolerance (±5%) with hysteretic recovery for safe PCB temperatures under all conditions

Auto-restart output short circuit and open-loop protection

EcoSmart–Easily meets all existing and proposed international energy efficiency standards–China (CECP) / CEC / EPA / European Commission

ON/OFF control provides constant efficiency to very light loads

No-load consumption <200 mW at 265 VAC

Ultra-low leakage current: <5 μA at 265 VAC input (no Y capacitor required)

Easy compliance to EN55015 and CISPR-22 Class B EMI

Green package: halogen free and RoHS compliant

LNK603-606/613-616 LinkSwitch-II 系列特性:

Energy-Efficient, Accurate CV/CC Switcher for Adapters and Chargers The LinkSwitch-II dramatically simplifies low power CV/CC charger designs by eliminating an optocoupler and secondary control circuitry. The device introduces a revolutionary control technique to provide very tight output voltage and current regulation, compensating for transformer and internal parameter tolerances along with input voltage variations.

The device incorporates a 700 V power MOSFET, a novel On/Off control state machine, a high voltage switched current source for self biasing, frequency jittering, cycle-by-cycle current limit and hysteretic thermal shutdown circuitry onto a monolithic IC.

LNK603-606/613-616 LinkSwitch-II 系列产品亮点:

Dramatically Simplifies CV/CC Converters

Eliminates Optocoupler and all secondary CV/CC control circuitry

Eliminates all control loop compensation circuitry

Advanced Performance Features

Compensates for transformer inductance tolerances

Compensates for input line voltage variations

Compensates for cable voltage drop (LNK61X series)

Compensates for external component temperature variations

Very tight IC parameter tolerances using proprietary trimming technology

Frequency jittering greatly reduces EMI filter cost

Even tighter output tolerances achievable with external resistor selection/trimming

Advanced Protection/Safety Features

Auto-restart protection reduces power delivered by >95% for output short circuit and control loop faults (open and shorted components)

Hysteretic thermal shutdown – automatic recovery reduces power supply returns from the field Meets HV creepage requirements between Drain and all other pins both on the PCB and at the package

EcoSmart  – Energy Efficient

Easily meets all global energy efficiency regulations No-load consumption <200 mW at 230 VAC and down to below 30 mW with optional external bias On/Off control provides constant efficiency down to very light loads – ideal for CEC and ENERGY STAR 2.0 regulations No current sense resistors – maximizes efficiency

Green Package

Halogen free and RoHS compliant package

Applications

Chargers for cell/cordless phones, PDAs, MP3/portable audio devices, adapters, LED drivers, etc.



图1.LNK603-606/613-616 LinkSwitch-II 系列方框图



图2.4.2W LED驱动器电路图



图2.4.2W LED驱动器PCB布局(61mm x 24mm).

材料清单(BOM):