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TPS55340 功率下降问题

Other Parts Discussed in Thread: TPS55340

有个技术上的问题请教你一下。怎么tps55340在升压到24v时输出功率40W。但烧机2分钟左右就下降到15W左右这个时候电压只有12v等于输入的电压。请问是怎么回事呢

此ic可以输出5A电压最大40v。理论上讲完全可以满足40W的功率使用呀。盼回复