This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TPS54362-HT: Diodes for TPS54362-HT

Part Number: TPS54362-HT

I'm using the 175°C TPS54362HPWP in a downhole application. In the datasheet for TPS54362HPWP there are recommended two diodes for the circuit. It is PDS360 and SBR8U60P5 but both diodes are only specified to 150°C operating temperature. Do you have any recommended diodes rated to 175°C for the TPS54362HPWP ?

  • Hey Norvald,

    We don't have a recommended diode that will be 175 C.

    I will make suggestions that the important part of the diodes we suggested is the very fast recovery of the diode and the low forward voltage.

    Finding a diode with those characteristics with those characteristics that can handle the power dissipation in your design will be the important part.

    Thanks,

    Daniel

  • Thank you for your answer.
    What about instantaneous reverse current, isn't that any part of the picture? At 175°C it can be very high for some diodes.
    BR,
    Norvald
  • Hey Norvald,

    What is your worry about the instantaneous reverse current?

    The purpose of the diode from the phase node to ground is to clamp the voltage of the pin during the flyback diode time. This is why we consider the reverse recovery time and forward voltage important.

    Thanks,

    Daniel

  • Hi Daniel,

    My worry about instantaneous reverse current is that many of the 175°C diodes have values around 30mA@20V/175°C. I can also see that when I change the diode to one with lower instantaneous reverse current the power consumption decreases at 175°C. Typical power increase is 15-20% from 25°C to 175°C due to the diode. I did a test with the diode isolated from 175°C exposure and the increase in power consumption was small.

    BR,
    Norvald

  • Hey Norvald,

    I see you are worried about the efficiency of the diode. Certainly that matters to the overall design, but for our device making sure the diode can clamp the voltage quickly to prevent damage to the pin will be important.

    Thanks,
    Daniel