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关于TIDA-00653双向DCDC评估板的模式切换问题

Other Parts Discussed in Thread: TIDA-00653

您好,我最近在学习TI开发的TIDA-00653双向DCDC评估板,我搞不清楚这款板子是如何实现Buck/Boost模式之间的切换的,我有以下几个问题望得到解决:
(1)我注意到这款板子是通过判断电流流向来决定Buck/Boost模式的,图一和图二是手册中所写的,图三是评估板的电流检测部分,那么3138是通过采集的哪个端口的电流来判断电流方向以确定工作模式的?