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DRV103的R(freq) = 47K，R(PWM) = 33.3K，Vs(6脚)与Vout(5脚)之间接20K电阻，
Vs-Vout输出电压入下图所示，高电平为24V，低电平最多拉低到20V左右，并不像手
册中的低电平可以到0V，请问什么原因？
如DRV103数据手册中所讲，Vout 与GND之间将会是一个PWM波形而不是Vs与Vout
FB电感多大？
