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TPS5420: does not start at low temperature

Part Number:

Good afternoon!
The chip does not start at temperatures below about 20-15 degrees Celsius . After warming up, it starts and works stably. Can overheating during soldering affect this?

P.S. 

typical circuit, lowering from 12 volts to 5 volts.
inductance 33 μH. when a malfunction occurs, the voltage is approximately 1.7V

  • there is a launch and stable operation with an inductance below 10 μH

  • there is a launch and stable operation with an in

    Yuri Tretyakov said:

    Part Number: TPS5420

    Good afternoon!
    The chip does not start at temperatures below about 20-15 degrees Celsius . After warming up, it starts and works stably. Can overheating during soldering affect this?

    P.S. 

    typical circuit, lowering from 12 volts to 5 volts.
    inductance 33 μH. when a malfunction occurs, the voltage is approximately 1.7V

    ductance below 10 μH

    there is a launch and stable operation with an inductance below 10 μH

  • Hello Yuri,

    I didn't quite understand the problem here, it looks like while using the 10uH inductor part could able to start fine and you resolved your problem. Is it true?

     Best Regards,

    Ankit Gupta

    Application Engineer

  • Hello Ankit!

    This is a temporary solution that I don’t think is right.
    According to the data sheet, the inductance should be 33 µH, if we calculate in the Webench, then 22 µH.
    When these inductances are installed, the microcircuit does not start when the air temperature is below 15 degrees Celsius. If the chip is heated, then it starts to work.
    The main question is, can this be a consequence of overheating when soldering a chip?

    Best Regards,

    Yuri.

  • Hello Ankit!

    I think I understood the reason for the unstable operation of the circuit. I put a diode BYG22 instead of B340.
    Please confirm that my guess is correct.