LM5143: How to understand interleaved single-output operation

yx yan

Intellectual 275 points

Part Number: LM5143

How to understand interleaved single-output operation?

If our application,7A output current,every phase current is 7A;or every phase current is 3.5A?

Thanks!

over 1 year ago

0 David Baba over 1 year ago

TI__Mastermind 40090 points

Hello Yx,

If you have a total output current of 7A, then a single output interleaved design will deliver 2.5A per phase to total the 7A requirements.

Hope this helps.

David.

0 yx yan over 1 year ago in reply to David Baba

Intellectual 275 points

Why 2.5A every phase?

My inductor current for every should be 2.5A+ΔI?

Can you show me the file explain interleaved theory?

Thanks!

0 yx yan over 1 year ago in reply to David Baba

Intellectual 275 points

Another question:

If I want to add gate resistor(27R) to four external mosfets,which footprint should I use,R0402 will be ok(how about the power on resistor)?

0 David Baba over 1 year ago in reply to yx yan

TI__Mastermind 40090 points

Sorry Yx, that was a typing error, I meant to say 3.5A per phase.

David.

0 David Baba over 1 year ago in reply to yx yan

TI__Mastermind 40090 points

Hello Yx,

you should be fine using 0402 resistor for gate drive currents.

Hope this helps.

David.

0 yx yan over 1 year ago in reply to David Baba

Intellectual 275 points

So,I choose inductor for 3.5A?

If current ripple is 30%,inductor heat current need be >4.55A?

Thanks!

0 David Baba over 1 year ago in reply to yx yan

TI__Mastermind 40090 points

Hello Yx,

please use the design calculator and it will recommend the inductor value for you. Yes, when choosing an inductor for a buck, make sure ripple is 30-50% of IOUT.

LM5143DESIGN-CALC Calculation tool | TI.com

Hope this helps,

David.

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LM5143: How to understand interleaved single-output operation