LP8868X-Q1: need component selection as per example data

SUNNY VERMA

Part Number: LP8868X-Q1

I want to drive matrix of Led 8 x12 @of 250mA per led and

VF of led is 3.2

input voltage range 8-16V

so please suggest how to select R sense and further component rating and value for selected part

0 Zhiqian Wu 4 months ago

Hi, Sunny

One quick questions from my side, so what is the setup of LED sting, also how about the total output current?

I assumed you will combine 8 string together, is it correct?

0 SUNNY VERMA 4 months ago in reply to Zhiqian Wu

yes 8 string and total 12 column=12X8=96 Led with total Iout 3A

0 Zhiqian Wu 4 months ago in reply to SUNNY VERMA

Hi, Sunny

For the Rsense, pls consider about below formula 200mV/3A = 66.7 mOhm.

0 SUNNY VERMA 4 months ago in reply to Zhiqian Wu

Thanks for that,

can you also find out value of Inductor for this load

0 Patrick Yao 4 months ago in reply to SUNNY VERMA

Hi Sunny,

Our expert is out of office and will give you feedback when comes back.

Patrick

0 Zhiqian Wu 4 months ago in reply to SUNNY VERMA

Hi, Sunny

Which switching frequency you want to use? Mostly for 400kHz switching frequency, we recommend to use 22uH for normal work condition.

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