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TPS5430无法正常工作,急求帮助

Other Parts Discussed in Thread: TPS5430

自己设计了一个电源版,其中包括用TPS5430来做12V到5V稳压。但输出电压怎么都只有2V,boot端电压却有9.6V,Vsense只有0.2V左右。

二极管用的B340A,功率电感用的10uH,33uH,47uH都试过,电容用的0603的0.01uF。

求高手指教!