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PowerintDER-2273W通用低功耗適配器設(shè)計(jì)方案  2012/3/1

         Powerint 公司的DER-227是采用LinkSwitch-XT 系列LNK362的3W通用低功耗適配器設(shè)計(jì)案例,輸入電壓從85V到265AC,3W單輸出(5V/0.6A),230VAC時(shí)無(wú)負(fù)載功耗小于10mW,工作模式的效率大于70%, 超過(guò)ENERGY STAR v2, EC CoC v4 和EuPTier 2的規(guī)范要求,滿足EN55022B/CISPR22B的EMI要求,主要用于手機(jī),PDA,數(shù)碼相機(jī),MP3/手提音頻播放器等充電器/適配器,以及家用電器,工業(yè)系統(tǒng)和計(jì)量表電源.本文介紹了LinkSwitch-XT 系列主要特性,方框圖,典型應(yīng)用電路以及采用LNK362的2 W 通用輸入的CV適配器電路圖, 3W通用低功耗適配器詳細(xì)電路圖和材料清單(BOM).

LinkSwitch-XT incorporates a 700 V power MOSFET, oscillator, simpleON/OFF control scheme, a high-voltage switched current source, frequency jittering, cycle-by-cycle current limit and thermal shutdown circuitry onto a monolithicIC. The startup and operating power are derived directly from the DRAIN pin, eliminating the need for a bias winding and associated circuitry.

Product Highlights

Optimized for Lowest System Cost

• Proprietary IC trimming and transformer construction techniques enable Clampless™ designs with LNK362 for lower system cost, component count and higher efficiency

• Fully integrated auto-restart for short circuit and open loop protection

• Self-biased supply – saves transformer auxiliary winding and associated bias supply components

• Frequency jittering greatly reduces EMI

• Meets HV creepage requirements between DRAIN and all other pins both on thePCBand at the package

• Lowest component count switcher solution

Features Superior to Linear/RCC

• Accurate hysteretic thermal shutdown protection –automatic recovery improves field reliability

• Universal input range allows worldwide operation

• Simple ON/OFF control, no loop compensation needed

• Eliminates bias winding – simpler, lower cost transformer

• Very low component count – higher reliability and single side printed circuit board

• Auto-restart reduces delivered power by 95% during short circuit and open loop fault conditions

• High bandwidth provides fast turn-on with no overshoot and excellent transient load response EcoSmart®– Extremely Energy-Effi cient

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