LM5116: Pls Help review PCB design, give same suggest? Thanks!

xiaofu wen

Part Number: LM5116

0 Andy Chen over 3 years ago

Hi,

What's the circuit schematic?

0 xiaofu wen over 3 years ago in reply to Andy Chen

Expert 2475 points

0 Andy Chen over 3 years ago in reply to xiaofu wen

Xiaofu,

Can you provide the PCB source file of LM5116 section? or provide print file as below:

1. Top overlay+Top layer

2. Bottom overlay+Bottom layer

3. Bottom layer+top layer.

B R
Andy

0 xiaofu wen over 3 years ago in reply to Andy Chen

Expert 2475 points

Pls Help review and give suggestion.Thanks!

0 Andy Chen over 3 years ago in reply to xiaofu wen

Hi,

Pls modify the circuit as attached

On the layout:

C91 position for IC is good

C92 position for HS LS FET is bad

VCC cap C68 was not placed close to IC, and short GND plane with multi vias.

B R

Andy

0 xiaofu wen over 3 years ago in reply to Andy Chen

Expert 2475 points

According to this change, IC temperature is still about 55 degrees, there is no great improvement, what is the possible reason?

0 Andy Chen over 3 years ago in reply to xiaofu wen

Can customer test board temp close to LM5116?

Keep VCCX cap 1uF, connect Vout 12V to VCCX pin, check if the IC temp will reduce?

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