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DRV8307芯片不上电

Other Parts Discussed in Thread: DRV8307

最近想用DRV8307驱动无刷直流电机,电路原理图是按照datasheet推荐电路设计的,供电电压27V,电源电压供电正常,但是发现DRV8307的回路VM引脚有电压,但是没有电流,检查过多遍外围电路和原理图电路,个人认为没有问题,难道是因为手工焊接VQFN封装芯片,焊接有虚焊造成的,还是什么原因,请高手指点一下啊!谢了!