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INA240电流采样波形异常,失真。MOS驱动,PWM

Other Parts Discussed in Thread: UCC27524

INA240A1作为电流采样,但输出波形是占空比,频率和PWM占空比一样。这是啥意思?

下图蓝色是MOS输出电流1A,黄色是INA240A1输出电压(输出端悬空,试过接RC也无效果)在2.5V上面叠加了一个占空比,占空比和给定MOS的PWM占空比一样。下图占空比30%,PWM频率15KHZ,母线电压10V左右。

下图占空比30%,PWM频率15KHZ,MOS输出电流2A左右。母线电压20V左右。

问题:为啥INA240A1芯片输出电压会是这样?datasheet上面所输出是直流电压啊?还望大家帮忙解答一下。

下面是原理图,L1是负载。