LP8864-Q1: backlight is abnormal

muxia zhang

Part Number: LP8864-Q1

Tool/software:

hello, TI team

I have one issue during our test, you can see the attachment for detail.

please support to analyze the root cause.

if need some else information, please let me know.

Thanks very much.

muxia Zhang

0 Steven Li over 1 year ago

Hi Muxia,

Our expert is currently out of office. He will reply to you next Monday. Thanks for your understanding.

Best Regards,

Steven

0 Zhiqian Wu over 1 year ago

Hi, Muxia

During the transient, supply needs to charge the cap after the PMOS and leads to a high current.

Could you pls remove the electrical cap to have a try again?

0 muxia zhang over 1 year ago in reply to Zhiqian Wu

hello， zhiqian

only try to remove C330 470uF?

Muxia Zhang

0 Zhiqian Wu over 1 year ago in reply to muxia zhang

HI, Muxia

Sure, the large cap after the PFET may leads a high current during the transient.

0 muxia zhang over 1 year ago in reply to Zhiqian Wu

hello, zhiqian

I removed the capaciotor C330,but the IC doesn't work, the backlight IC doesn't output.

muxia Zhang

0 Zhiqian Wu over 1 year ago in reply to muxia zhang

Hi, Muxia

As talked in the phone, it worked and I will close this case.

Power management forum