LP8866S-Q1: test wave confirm

Mengyao Ding

Part Number: LP8866S-Q1

Tool/software:

Hello team,

We use the LP8866S to deriver one string LED with 12LED and the hybrid dimming mode used.

below is the SW node test wave and we find the rise +fall time can not meet the datasheet right, any effect for our usage?

0 Gracie Guo 5 months ago

Hi Mengyao,

Expert will reply to you later.

0 Zhiqian Wu 5 months ago

Hi, Mengyao

How do you do the calculation?

0 Mengyao Ding 5 months ago in reply to Zhiqian Wu

from wave the rise time is 18.71ns and fall time is 8.441ns, so the total is 27.151ns.

right?

0 Zhiqian Wu 5 months ago in reply to Mengyao Ding

Hi, Mengyao

It is a typo here, lower is OK.

0 Mengyao Ding 5 months ago in reply to Zhiqian Wu

How to understood it? can you help explain more details?

0 Zhiqian Wu 5 months ago in reply to Mengyao Ding

Hi, Mengyao

The total Rise time and fall time needs to lower than minimum off to avoid it.

0 Mengyao Ding 5 months ago in reply to Zhiqian Wu

thanks for your reply

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