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TPS92515HV: Temperature Stress Reliability Concern

Antonio Fadhel
Genius 9410 points
Part Number: TPS92515HV

Hi,

My customer has a design with multiple TPS92515HV regulating about 45Vout at 1.6A. They measured the case temp of the 92515 to be around 65C. Would you expect any reliability issues due to thermal stress? 

I ran some rough numbers and this seems fine for a typical 300mOhm Rdson device, but am concerned in the case of the max 600mOhm spec.

Thanks,

Antonio

  • 0
    TI__Mastermind 25500 points

    Hello Antonio,

    It can get hot at high input voltages and high currents, but 65C isn't that excessive. When that temperature is measured the Rds(on) will be on the higher end as well due to the positive tempco of FETs. In reality the device's thermal shutdown will prevent damage in any case.

    That said you could also do things to reduce the temperature like adding more copper area and/or using 2oz copper. Generally at higher input voltages a lower switching frequency is used as well to reduce temperature since the AC losses are directly proportional to Fsw and Vin^2.

    Regards,

    Clint