LMR51450: IC thermal

Chen Alex1

Genius 3755 points

Part Number: LMR51450

Hi SIR

I Got the TI evb, After test the evb,

I found the IC over 60 deg, Did you have idea to reject the thermal on chip?

thanks

Vin:36v,Vout 5v/4A

over 1 year ago

0 Andrew Kutzler over 1 year ago

TI__Mastermind 23795 points

Hi Alex

I don't have any boards to test (I ordered them, they should arrive in a week).

The part is ~88% efficient at that condition:

In that state the chip is heating up because of about ~2.4W of losses. That seems reasonable on the Eval board. In a real application you can improve this by having a larger PCB board area. This lets there be more copper to cool the board.

Thanks,

Andrew

0 Chen Alex1 over 1 year ago in reply to Andrew Kutzler

Genius 3755 points

HI Andrew

Did you have any suggestion for EMI filter & EMC solution for LMR51450?

Thanks

0 Andrew Kutzler over 1 year ago in reply to Chen Alex1

TI__Mastermind 23795 points

Hi Alex,

A good place to start would be to use the EMI filter used on the EVM. I'd recommend a pi filter as well has a electrolytic capacitor to reduce conducted EMI emissions. See below:

Please see this app note for more details on how to design an EMI filter: Section 4.4 damping capacitor

Thanks,

Andrew

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LMR51450: IC thermal