UCD9222 差分电压反馈问题

请教TI的工程师们一个问题，UCD9222的差分电压反馈EAP与EAN在布线时若是没有遵从差分布线要求，会有什么后果？目前我设计的板卡大概有10%的概率上电失败，不知道是否是这个原因引起？

另，UCD9222的datasheet中，提到其“Unlike many other products in the UCD92xx family, the UCD9222 does not support assigning power stages to arbitrary rails, or combining multiple power stages on the same rail. The UCD9222 supports up to two single-phase rails, and the channel number of each rail’s DPWM output must match that of its EAP/EAN feedback inputs.” 而UCD7242的datasheet中又为其提供了20A并联的输出方式如图：

那么UCD9222的一个输出链路上接一个并联输出的UCD7242会不会出现问题呢？