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Questions of TPS50601-SP

Other Parts Discussed in Thread: TPS50601-SP

We have questions about TPS50601-SP.

Question 1.

Please tell us the condition that this IC stops switching.

Are there any conditions other than the following?

  - The voltage follows below the threshold of UVLO.

  -  The voltage follows below the threshold of Enable(1.032V).

  - Thermal shutdown

Question 2.

We check the phenomenon that the IC stops switching in low temperature(0~5℃).

We think that there are no ploblems about threshold of UVLO and EN.

Do you know the reason why the IC stops switching in low temperature(0~5℃)?

Best regards,

Takahiro Nishizawa

  • Hi Nishizawa-san, please notice the 1.032 V mentioned in the Detailed Description section is a typo. The correct number is 1.05 V as shown in the Electrical Characteristics table. Is there a way to actually monitor the voltage at the EN pn when tested at that temperature? I am assuming you are using a resistor divider, can you please confirm the values? If you probe the EN pin, that would tell us exactly whether some components are drifiting.

    Thanks,

    JV
  • Thank you for your answer!

    We check the EN voltage.
    Is voltage drop at EN pin by resistor divider and stop switching in low temperature related?

    And we are interested in internal regulator for low side FET.
    Is it supposed that the operation of the regulator will fluctuate at low temperature?
    (Datasheet p.15 Functional Block Diagram)
    We are concerned about input AC noise.

    Best regards,
    Takahiro Nishizawa
  • Hi Nishizawa-san, you mentioned the regulator stops switching so perhaps it's being disabled. Without knowing the EN configuration (resistor divider information and VIN), it is difficult to know for sure which is why I mentioned to monitor the EN pin when this happens.

    The regulators will depend on the VIN voltage so if for some reason VIN is falling below the VIN UVLO threshold, the part will be disabled as well. As you can see, this also relates to the EN pin as it also depends on VIN.

    Thanks,

    JV