LM5164: High recommended Idc explanation

Clément Letonnelier

Expert 2786 points

Part Number: LM5164

Tool/software:

Hello,

I have a question regarding the suggested Idc value for the inductor in buck layout.

The suggested inductor Idc value is 2.61A - 52.29A. Why is that ?

I would have been expecting to see, not the 1A that it is able to output but the peak current (1.75A).

Typically, I am designing with following spec:

And would have expected the MSS1048T-473MLC to be suggested.

Best regards,

Clément

5 months ago

0 David Baba 5 months ago

TI__Mastermind 39980 points

Hello Clement,

What is suggesting 52.9A? Please can you elaborate, thanks.

David.

0 Clément Letonnelier 5 months ago in reply to David Baba

Expert 2786 points

David,

Webbench.

Clément

0 David Baba 5 months ago in reply to Clément Letonnelier

TI__Mastermind 39980 points

Hello Clement,

I can only assume it's looking up in a library of all the components that it has available and will work, does not mean it's very suitable.

Hope this helps.

David.

0 David Baba 5 months ago in reply to David Baba

TI__Mastermind 39980 points

PS, it's not the IOUT current but limited by the max IPEAK current, hence the 2.61A...

David.

0 Clément Letonnelier 5 months ago in reply to David Baba

Expert 2786 points

David,

Yes this is my understanding.

But why isn't it suggesting for example the one I suggested ?

Is it because you consider it at 10% drop for the component selection ?

Best regards,

Clément

+1 David Baba 5 months ago in reply to Clément Letonnelier

TI__Mastermind 39980 points

Hello Clement,

I think you can use the inductor you suggested above. Probably conservative measures are disqualifying it in WEBENCH.

Hope this helps,

David.

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LM5164: High recommended Idc explanation