TPS548B28: Thermal reliability of TPS548B28

Fred Cheng

Expert 5430 points

Part Number: TPS548B28

Hi team,

customer want to qualified our TPS548B28 by the below test spec

Vin=12V

vout=5V

Iout=20A

Duration 4 hours

However the datasheet show the room temperature seems close to the limit without any air flow.

would you provide any related test material for our reference?

Regards,

Fred

over 3 years ago

0 David_Daniels over 3 years ago

TI__Mastermind 22180 points

Here is the test method for gathering the SOA data https://www.ti.com/lit/an/slva766/slva766.pdf

The TPS548B28 was optimized for the lower output voltages at full load. For 12V to 5V at 20A, use https://webench.ti.com/power-designer/switching-regulator/select

to select a suitable solution for the 20A 5V load.

0 Fred Cheng over 3 years ago in reply to David_Daniels

TI__Expert 5430 points

Hi David,

I will study your first link,

however, somehow I can't get any info regarding TPS548B28 in your second link, I know you try to show me the optimized BOM to have better thermal relaibility or something.

Would give me a screenshot or detail in context?

Regards,

Fred

0 David_Daniels over 3 years ago in reply to Fred Cheng

TI__Mastermind 22180 points

What ambient temperature are you designing for. The data was gathered on an EVM and is an optimized layout. Airflow is a method to improve.

Use webench, with the 12V to 5V at 20A at the max ambient. The TPS548B28 may not be an optimal solution for your application and webench can find appropriate solution.

0 Fred Cheng over 3 years ago in reply to David_Daniels

TI__Expert 5430 points

Below is my customer spec:

Temp_Amb= 70 deg C

Max junction/board temp =110 deg C

150 LFM airflow

although, we don't have air flow equipment, do you know what kind of component can achieve this ?

0 David_Daniels over 3 years ago in reply to Fred Cheng

TI__Mastermind 22180 points

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TPS548B28: Thermal reliability of TPS548B28