原标题：Powerint LNK576DG超低无负载功耗8W电源解决方案

　　powerint公司的LNK576DG是LinkZero-LP系列产品之一,无负载时的功耗小于5mW,大大低于IEC所定义的无负载时的功耗,主要用在移动/无绳电话,PDA,电动工具,MP3, 剃须刀等充电器.本文介绍了LinkZero-LP系列产品亮点, 功能框图以及超低无负载功耗8W电源评估板主要指标,电路图,材料清单和PCB布局图.

　　Chargers for cell/cordless phones, PDAs, power tools, MP3/portable audio devices, shavers, etc LinkZero-LP, an upgrade to PI’s popular LinkSwitch-LP, incorporates new technology which enables the device to automatically enter into and wake up from no-load mode while disipating less than 5 mW - substantially less than the IEC definition of zero no-load power consumption. The tightly specified FEEDBACK pin voltage reference enables universal input primary side regulated power supplies with accurate constant voltage from 5% to full load. Start-up and operating power are derived directly from the DRAIN pin which eliminates start-up circuitry. The internal oscillator frequency is jittered to significantly reduce both quasi-peak and average EMI, minimizing filter cost.

　　LinkZero-LP系列产品亮点:

　　Lowest System Cost with Zero No-Load

　　Automatically enters zero input power mode when load is disconnected

　　Simple upgrade to existing LinkSwitch-LP designs

　　Very tight IC parameter tolerances improve system manufacturing yield

　　Suitable for low-cost clampless designs

　　Frequency jittering greatly reduces EMI filter cost

　　Extended package creepage improves system field reliability

　　Advanced Protection/Safety Features

　　Accurate hysteretic thermal shutdown protection – automatic recovery reduces field returns

　　Universal input range allows worldwide operation

　　Auto-restart reduces delivered power by >85% during short-circuit and open loop fault conditions

　　Simple ON/OFF control, no loop compensation needed

　　High bandwidth provides excellent transient load response with no overshoot

　　EcoSmart™ – Energy Efficient

　　No-load consumption as low as 4 mW at 230 VAC input*

　　Easily meets all global energy efficiency regulations with no added components

　　ON/OFF control provides constant efficiency to very light loads

　　LinkZero-LP系列应用:

　　Chargers for cell/cordless phones, PDAs, power tools, MP3/portable audio devices, shavers, etc.

　　图1. LinkZero-LP系列功能框图

　　超低无负载功耗8W电源评估板

　　This report describes a universal input, 5 V, 1600 mA flyback power supply using a LinkZero-LP family of ICs. It contains the complete specification of the power supply, a detailed circuit diagram, the entire bill of materials required to build the supply, extensive documentation of the power transformer along with test data and oscillographs of important electrical waveforms.

　　超低无负载功耗8W电源评估板主要特性:

　　Ultra low no-load consumption, <4 mW at 230 VAC with 1 mW pre-load

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　　EcoSmartTM – 70% average efficiency, exceeds standards requirement of 67%, and thus meets all existing and proposed harmonized energy efficiency standards including: CECP (China), CEC, EPA, AGO, European Commission

　　图2. 超低无负载功耗8W电源评估板外形图

　　超低无负载功耗8W电源评估板主要指标:

　　图3. 超低无负载功耗8W电源评估板电路图

　　超低无负载功耗8W电源评估板才清单: