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Buck电路Mos管电流不正常?

Other Parts Discussed in Thread: INA213, TPS40200

用TPS40200的EVM板测试时,测量经过限流电阻R2的电流波形如下。按我的理解,通过R2的电流等于MOS管的电流,在MOS管关断时应该为0。但为什么测出来的电流在MOS管关断时线性下降?我的原理图就是TPS40200 EVM的原理图,R2上的电流是通过INA213放大之后测量的。

测试条件:输入12V,输出5V,电流0.5A。图中CH1是R2电流波形,CH2是开关节点电压。