LM5158-Q1: Specification inquiry

David Kim2

Genius 3305 points

Part Number: LM5158-Q1
Other Parts Discussed in Thread: LM5158

I'm going to design DC-DC of the following specification with LM5158.

-SPEC-

Input: DC 9~32V

Output: DC 12.5V 2A

However, in WEBENCH, it is said that it is out of the allowable current.

I think it will be possible if you look at the data sheet, please let me know if it is possible.

Thanks

over 1 year ago

0 Niklas Schwarz over 1 year ago

TI__Mastermind 30260 points

Hi David,

Thanks for using the e2e forum.
These specs look valid to me for a LM5158 design.
Do you plan in implementing a Flyback or SEPIC topology?

An alternative calculation tool are the quickstart calculators, which I would even recommend above webench, as they take more inputs and therefore often return more accurate recommendations.
The calculators can be downloaded from the product page:
https://www.ti.com/product/LM5158-Q1#design-development

Best regards,
Niklas

0 David Kim2 over 1 year ago in reply to Niklas Schwarz

Genius 3305 points

Hi Niklas

Thanks for your response.

I plan to implement SEPIC.

I will design it using the calculator you sent me.

Thanks

0 Niklas Schwarz over 1 year ago in reply to David Kim2

TI__Mastermind 30260 points

Hi David,

Thanks for the update.
Please let me know if you have any problems with the SEPIC design calculator.
In the meantime I will close this thread.

Thanks and best regards,
Niklas

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LM5158-Q1: Specification inquiry