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LP8864-Q1: Whether output float or connect to GD when no use

Part Number: LP8864-Q1

Hi Team,

My customer only use 3 channels (out1-3) in LP8864.

When output 4 is floating, it could lighten the display.

But when output 4 is connected to GNP, it could not lighten. And GD waveform is as following (fsw=500kHz), INT=0.