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TPS53355DBQ 电流只能加到8A左右 之后瞬间输出0V

Other Parts Discussed in Thread: TPS53355

想把2节串联锂电池的 降压到5V 锂电池最大放电电流 15A ,我需要的最大电流是5V 14A,

现在电流只能加到8A,然后会LL会震荡,Vout瞬间被拉到0V。每次都是我把电流升到8A,Vout瞬间被拉到0V,这个低电平大概维持2ms(没记住),然后又变回5V,麻烦各位先根据电路帮我分析下,要是需要我在上示波器波形。