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TPS56837: Heat sink

S.Jency Viola
Prodigy 70 points
Part Number: TPS56837

We used the TPS56837 IC for 5V output in our design. Is this IC need heatsink ? 

  • 0
    TI__Genius 15117 points

    Hello Viola,

    I don't think necessary. TPS56837 has good thermal performance. You can use webench thermal simulation.

    24Vin-5Vout-8A-500kHz-25C Ta, see below estimated Tj, about 79.54℃.

  • 0
    Prodigy 70 points

    In our design we have to use this TPS56837 DC - DC Buck convertor. The Input voltage is 12V and the output Voltage is 5V with 8A current.  I simulate the circuit in we bench  designer, from the results the total power dissipation is 2.994W.  And I check the thermal stress for the IC @25 C its getting 152.59% of thermal stress. I need clarification on this issue.  Whether heat sink is required or not.

  • 0 in reply to S.Jency Viola
    TI__Genius 15117 points

    Hello Viola,

    It really depends on your application conditions (what's your ambient temperature? If high, maybe need to add heat sink; how many layers of your PCB board, does your board have good thermal dissipation performance?) and your thermal requirement (e.g. IC temp lower than 80C?).

    I simulated 12Vin-5Vout-8A-500kHz-25C Ta, webench estimated IC temperature is 75C. May I know how your '52.59% of thermal stress' come from?

    Our device max Tj is 150C. It has thermal shutdown protection when Tj beyond 165C.