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TPS40090: Doubts about the current waveform measured by the method of DCR Curent Sense

Part Number: TPS40090

Tool/software:

Why is the falling edge of the DCR Current Sense waveform not a smooth downward straight line, but a rising and falling line? The actual waveform shown in the figure has a period of 3.5us and a rising edge of about 500ns. The simulated waveform is shown in Figure 2