LP8864-Q1: LP8864-Q1 dimming can't response when input PWM on-time change time more than 6.4us

Jingkun Wang

Intellectual 295 points

Part Number: LP8864-Q1

Hello TI Team,

LP8864-Q1 is set in Phase-shift PWM mode and the input PWM frequency is 211Hz.

When doing below operation, the dimming on-time doesn't change:

The input PWM on-time had met the PWM detector hysteresis requirement, but the dimming still didn't change.

Could you confirm the issue?

Best Regards!

over 1 year ago

0 Zhiqian Wu over 1 year ago

TI__Mastermind 31585 points

Hi, Jingkun

How about increase duty cycle more?

Does dimming can be changed?

0 Jingkun Wang over 1 year ago in reply to Zhiqian Wu

Intellectual 295 points

Hi Zhiqian,

Dimming can changed when input PWM duty cycle increases.

Best Regards!

0 Zhiqian Wu over 1 year ago in reply to Jingkun Wang

TI__Mastermind 31585 points

Hi, Jingkun

I have explained this case in the email to the FAE, pls let me know if you have any other concern.

0 Jingkun Wang over 1 year ago in reply to Zhiqian Wu

Intellectual 295 points

Hi Zhiqian

Thank you. Wait for your reply.

Best Regards!

0 Zhiqian Wu over 1 year ago in reply to Jingkun Wang

TI__Mastermind 31585 points

Hi, Jingkun

Does FAE reply to you? I suppose they have contacted with you.

0 Jingkun Wang over 1 year ago in reply to Zhiqian Wu

Intellectual 295 points

Hi Zhiqian

Is Miyaoka-san ?

Best Regards!

0 Zhiqian Wu over 1 year ago in reply to Jingkun Wang

TI__Mastermind 31585 points

Hi, Jingkun

Yes, I contact with Miyaoka-san.

And I will close this thread.

0 Jingkun Wang over 1 year ago in reply to Zhiqian Wu

Intellectual 295 points

Hi Zhiqian,

OK, thank you for your support.

Best Regards!

Power management

Power management forum

LP8864-Q1: LP8864-Q1 dimming can't response when input PWM on-time change time more than 6.4us