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TPS92200D1EVM: How to turn off LED instantly?

Part Number: TPS92200D1EVM
Other Parts Discussed in Thread: TPS92200

Hi Expert:

In the following diagram,the green line is the LED-290+ which is the output of the TPS92200.

I send zero voltage to DIM pin of TPS92200.

So the output voltage of TPS92200 start to turn off.

The voltage of LED anode down slowly.

I wonder this voltage will not turn off the LED totally.

LED is still a little on.

How could I turn off the LED instatly (when I send 0 to the DIM pin)?

best regards