LP8555: shows red light during screen turn off

Kailun Liu

Part Number: LP8555

Tool/software:

Hi team,

We met a issue in PAD that the screen shows red light during turned off, we suspect that it is due to the current is decrease too fast during turn off.

Do you think it is the root cause? Can LP8555 slow down the current decrease during screen turn off?

2 days ago

0 Colin Chen 2 days ago

TI__Mastermind 21131 points

Hi Kailun,

It is hard to know the root cause from a short description.

Could you capture the waveforms of SW, Vout, and VLED ,Iout? And schematic is also needed.

By the way, i don't understand why there is a red light in your PAD. The LED should be white light.

Thanks,

Colin

0 Kailun Liu 2 days ago in reply to Colin Chen

TI__Expert 3043 points

Thanks Colin,

Will do, is that possible to control the speed of turn off current?

0 Andy Chen 1 day ago in reply to Kailun Liu

TI__Mastermind 34255 points

Our expert will update you early next week.

0 Colin Chen 1 day ago in reply to Kailun Liu

TI__Mastermind 21131 points

Let me check next Monday

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LP8555: shows red light during screen turn off