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DRV8323R: VDS 异常过流、检流电阻端异常过流问题

Part Number: DRV8323R


有两个问题想咨询下:

1、我的硬件电路基本上与规格书推荐电路一致,区别点在于VM供电为15V,而VDRAIN供电为24V,此时上电后驱动器报上管VDS 过流保护,此时H桥上端输出为三角波,而下端输出与PWM波(OCP此时已设置为最大阈值),当把VM更改为24V后,上下管的G级均输出互补PWM,波形正常,不报VDS过流保护,想问下原因是什么,因为电压都是满足规格书要求的,电荷泵电压也正常,望解答

    黄色为上管G级异常波形,绿色为下管G级波形

2、当固件写入CSA control寄存器时,报SA_OC、SB_OC、SC_OC过流,即使写入默认配置依然报过流错误,但当在写入寄存器前加1ms延时,就不会再报过流问题了,想问下寄存器的写入也有逻辑要求或时间要求吗?