Powerint DER-228 15W电源设计案例
Powerint 公司的DER-228 15W电源设计案例是采用TinySwitch-III 系列的TNY278P器件,无负载的输入功耗低于30mW,输入电压从85VAC到265VAC,输入电压12V,输出电流1.25A,采用反激架构. TinySwitch-III系列采用ON/OFF控制方案,集成了700V的MOSFET,振荡器,高压开关电流源,限流和热关断电路,为低功耗电源设计提供了很灵活的解决方案.本文介绍了TinySwitch-III 系列TNY278P器件的主要特性,方框图以及12 V, 1 A 通用输入电源电路图和DER-228 15W电源设计案例的详细电路图和材料清单.
TinySwitch-III incorporates a 700 V power MOSFET, oscillator, high voltage switched current source, current limit (user selectable) and thermal shutdown circuitry. The IC family uses an ON/OFF control scheme and offers a design flexible solution with a low system cost and extended power capability.
TinySwitch-III 系列主要特性:
Lowest System Cost with Enhanced Flexibility
• Simple ON/OFF control, no loop compensation needed
• Selectable current limit through BP/M capacitor value Higher current limit extends peak power or, in open frame applications, maximum continuous power Lower current limit improves efficiency in enclosed adapters/chargers Allows optimum TinySwitch-III choice by swapping devices with no other circuit redesign
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