LM5148: LM5148 design review

Peter Tseng

Genius 5555 points

Part Number: LM5148

Hi Team,

Please help to review the customer design and input your comments.

Thanks.

LM5148.pdf

1 month ago

0 David Baba 1 month ago

TI__Mastermind 26620 points

Hello Peter,

please can you fill out the design calculator, attached below. This will help me understand your spec to check your design against, thanks.

4214.LM5148-LM25148 Quickstart Calculator.xlsm

David.

0 Peter Tseng 1 month ago in reply to David Baba

Genius 5555 points

Hi Sir,

Please find attached file for Excel tool result.

Thanks.

0513.LM5148-LM25148 Quickstart Calculator.xlsm

+1 David Baba 1 month ago in reply to Peter Tseng

TI__Mastermind 26620 points

Hello Peter,

Recommend the following.

Set Ilimit to 9A as you max IOUT is set to 6A. This means using a Rsense of 6mR and Lbuck of 12uH.

The calculator can be set up for internal Compensation as you have configured, this should a cross over frequency of 10kHz and a PM of 60 degrees which should provide a stable loop response.

Recommend a small RC filter at the current sense input also.

Hope this helps.

David.

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LM5148: LM5148 design review