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请推荐个电路，谢谢~
Hi
http://www.ti.com.cn/cn/lit/an/slva369a/slva369a.pdf
参照上述文档设计。
TPS54160是TPS54140 的60V版本，其实按照你的条件选择TPS54160更适合，原因是您的电压是39V, 已经很接近42V的输入电压值。
