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TPS5450: When the output current is 2A, the temperature is too high.

Depeng Man
Intellectual 2030 points
Part Number: TPS5450

Hi team，

I use TPS5450 to do 24V to 5V. When the current reaches 2A, the temperature reaches 100 degrees Celsius. What can I do to solve this problem?

When the Schottky diode is used by SBRD10200TR, the heat is more serious, and then replaced by SS10100, when the heat is 2A, it is close to 100 degrees Celsius.

The board is made of 2 layers.

Best Regards

James Man

  • 0
    TI__Guru 50120 points

    Hi James,

    If the part/board is getting hot, that means the device is dissipating heat but the heat path/flow is being trapped. 

    With a two layer board it is important to have 2oz copper on top and bottom, and as much unbroken ground plane for thermal dissipation.

    Looking at the PCB layout, the device looks to be in a corner of the PCB which will limit heat flow since heat dissipates radially from point of switching.

    Additionally the bottom layer appears to have GND choked by the "L-shaped" copper plane so heat will only dissipate in one single path on each layer.

    The TPS5450EVM is a 4 layer board with adequate GND copper plane for heat dissipation. Since you are using a 2 layer board, the thermals will be significantly worse. 

    Also please make sure that the catch diode selection follows Section 8.2.2.8. For the TPS5450EVM, the B540A was chosen.

    Regards,

    Jimmy 

  • 0 in reply to Jimmy Hua
    TI__Intellectual 2030 points

    Thank you so much！

    I've conveyed it to the customer

    Have a good day  ^_^

    James

  • 0 in reply to Depeng Man
    TI__Guru 50120 points

    Hi James,


    Thanks for using E2E forum.

    Regards,

    Jimmy