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TPS40303不明原因损坏,能调试好,就是不明白原理!!

Other Parts Discussed in Thread: TPS40303

TPS40303设计19V转12V电源,webench工具导出的设计方案,使用中上35W负载没问题,换成75W,一上电40303就坏,其他器件完好,试了10片板,都是如此现象,经调试软启动延迟问题解决,但就是不明原理,不敢下料批量,求支招!!