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TPS92611-Q1: Disconnect the GND of chip, LED will light on

Part Number: TPS92611-Q1

Tool/software:

Hi export,

In our design, LED driver is on 1 board, LED is on another board.

When disconnect the GND of driver, connect 12V battery, connect LED board GND. Like below figure

The LED will be light up, current is about 15mA.

What is the reason? How can we solve it?

Thanks a lot!