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关于TPS65910的启动问题

Other Parts Discussed in Thread: TPS65910, AM3359

您好,最近做了一块板子用的是TPS65910给AM3359供电,遇到的一个问题是当给TPS65910的5V输入加上后,还需要对33脚PWRON一个负脉冲新号,芯片才会有输出。请问有什么办法可以使该芯片在加入5V输入后立即具有输出,否则还需要加入额外的负脉冲产生电路使芯片启动。请指教,谢谢