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DRV110: 激励持续时间(Keep time)过长/差异较大问题

Part Number: DRV110

您好!

我在开发过程中遇到了DRV110APWR的相关问题,如下:

KEEP脚电容为1.5uf/5%的聚丙烯薄膜电容,根据规格书来看,实际激励持续时间应该约150ms,算上电容精度的误差也应该在142-158ms之间,但实测同一批次的5台样机,有出现一台激励持续时间会有达到160ms,另外一台达到172ms,其余三台中有两台在150ms左右,另外一台约145ms。导致激励持续时间过长(差异较大)的问题可能与什么有关?

下图是DRV110A周围器件以及线圈中流过的电流波形。