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DRV8301: 上电不正常

Part Number: DRV8301
Other Parts Discussed in Thread: DRV8303

连接24V直流电源并将ENABLE引脚拉高后,nFault引脚为高电平,但nOCTW引脚一上电即为低电平。PVDD为24V,但GVDD无电压输出,DVDD为4V且有较大纹波,AVDD为7.11V。

以上是drv8301的原理图,nfault与noctw处连接的mosfet是n沟道的。