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LP8863-Q1: Paralleling of two device for High output current

Johnson John

Intellectual 640 points

Part Number: LP8863-Q1
Other Parts Discussed in Thread: TPS61196-Q1

Hello,

Can you clarify below query on LP8863-Q1 device:

Our requirements are, Input: 12V, Output max 45V, 4 Channel LED string, each string 250mA current loading.

I understand that the LP8863-Q1 can support 150mA on each output and we can parallel two outputs so that we can get 300mA current support. If I do so, with Single LP8863-Q1 device, I can only make 3 Channel LED string outputs and for a remaining channel I need to use another device.

My question, Can I add another LP8863-Q1 device in parallel without Boost circuit to control the Fourth channel output LED string? So that I can save Inductor, capacitors, diode and MOSFET required for second LP8863-Q1 device.Please confirm. If we can do, do I need to ensure any specific comments in I2C, can you share application notes if any?

Thank you

over 5 years ago

0 Charles-Chen over 5 years ago

TI__Genius 11836 points

Hi Johnson,

I am out of office on holiday and will get back to you on 6th May.

0 Charles-Chen over 5 years ago

TI__Genius 11836 points

Hi Johnson,

I have checked with my team and we don't recommended to do so temporarily for this device.

Can you change the structure of LED string to reduce the current of each string instead?

0 Johnson John over 5 years ago in reply to Charles-Chen

Intellectual 640 points

Hi Charles,

Thank you for the response.

No, I checked that option and string change is not possible.

Can you recommend any other device which meets the requirements.(analog or Digital control, as long as output power is meeting the requirement)

Thank you,

Johnson John

0 Charles-Chen over 5 years ago in reply to Johnson John

TI__Genius 11836 points

Hi Johnson,

Maybe you can check TPS61196-Q1. It can support master/slave mode. But the input voltage is only 8-V to 30-V. What's your input voltage?

0 Charles-Chen over 5 years ago in reply to Charles-Chen

TI__Genius 11836 points

Hi Johnson,

Since you have no reply for a long time and I will close this thread. You can ask in this thread again if you get any feedback.