LP8866S-Q1: Output voltage

Youhei Miyaoka

Part Number: LP8866S-Q1

Hi team,

The customer don't understand the set value of the output voltage.

In my understanding, they should set Vo = VF x n(LED#). Is it correct?

Or add voltage for condition fault monitoring?

Regards,

Youhei MIYAOKA

0 Monet Xu 6 months ago

Hi MIYAOKA，

our expert is in the sick leave and he will provide suggestion once back to the office.

Monet Xu

0 Youhei Miyaoka 6 months ago in reply to Monet Xu

OK, I understood.

+1 Monet Xu 6 months ago in reply to Youhei Miyaoka

Hi MIYAOKA,

please refer to the below equation for VLED calculation:

VLED = VF * N(LED NUMBER) + Current Sink Headroom(0.7V) + Vdrop

VF: LED forward voltage

Current Sink Headroom: 0.7V

Vdrop: the VLED voltage drop caused by PCB layout resistance. you can remain some margin when design the VLED voltage.

Monet Xu

+1 Zhiqian Wu 6 months ago in reply to Monet Xu

HI, Youhei

For a quick calculation of the output voltage, (Vf * n + 5V) is a quick calculation equation.

0 Youhei Miyaoka 6 months ago in reply to Zhiqian Wu

Hi Monet and Zhiqian,

Thanks for your feedbacks!

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