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TPS61196: TPS61196上电闪一下就灭的问题

Part Number: TPS61196


使用TPS61196芯片设计成主从应用。产品是每串70V,22.5mA,共4串。目前使用主芯片IFB1给两串产品使用,IFB给产品另两串。电流大小是通过PWM控制。附件是原理设计图,请帮忙分析下,谢谢!Sheet.pdf