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[原创] TI TPS7A78智能AC-DC线性电源解决方案

关键词:电源管理 AC/DC转换器 TPS7A78

时间:2019-04-16 10:48:43       来源:中电网

TI公司的TPS7A78是120mA智能AC/DC线性电压稳压器,在容易使用非磁性AC/DC转换方案中提高了整个效率和待机功耗.TPS7A78采用外接电容来创立电流源和箝位整流电压.器件的独特架构允许其待机功耗能从几百毫瓦降低到十几毫瓦.TPS7A78非隔离功率解决方案的输入电压70 VAC到 270VAC45 Hz 到65 Hz,高达75%的效率,支持输出电压从1.25V到5V,待机功耗15mW,线路压降电容器为线性解决方案尺寸的1/4,对火线电压,负载和温度的精密电压调整达到3%精度,具有电源故障检测和电源良好指示.主要用在工厂自动化,建筑物自动化,白色家电,电能表表,烟雾检测器恒温器控制.本文介绍了TPS7A78主要特性,功能框图,单相AC电源和三相AC电源图,单相E表电源图以及评估模块TPS7A78EVM-011主要特性和电指标性能,电路图,材料清单和PCB设计图.

The TPS7A78 improves the overall efficiency andstandby power in power supplies for an easy-to-usenon-magnetic approach to AC/DC conversion. TheTPS7A78 uses an external capacitor to create acurrent source and actively clamps the rectifiedvoltage. The device then regulates the voltage downto the application-specific operating voltage. Theunique architecture of the device allows the standbypower to be reduced from several 100s of milliwattsto just a few 10s of milliwatts. The TPS7A78 takesadvantage of an innovative switched capacitor stageto reduce the clamped voltage down byapproximately 1/4th of the value, which in turnmultiplies the current by 4. Thus, the current sourcecapacitor can be much smaller in size, whichminimizes standby power, reduces solution size, andcan lead to a lower sys..

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