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TPS63061: Load disconnected when Vin too low?

Jacques Paris1
Prodigy 40 points
Part Number: TPS63061

Hello,

The TPS63061 clearly specifies "Due to the 4-switch topology, the load is always disconnected from the input during shutdown of the

converter".

On our design the issue is that the input power supply could goes down because it does not have enough power for the load.
Does the TPS63061 disconnect the load when Vin is lower that 2.5V (it is a sort of shutdown)?
If the TPS63061 shutdown because Vin is too low, how long will it take to restart?
Is there a risk of rapid cycling?

  • 0
    TI__Intellectual 1700 points

    Hi Jacques,

    Thank you for using our device!

    Please check section 8.3.4 in the spec. Most likely you are triggering undervoltage lockout. In UVL the device also enteres shutdown, until the input voltage has recovered.

    Regarding the risk of rapid cycling: if the UVL is triggered, then the load gets disconnected. If there is no other load to crank the supply, it will recover, restart device and if the load condition still exists, it will recycle this scenario.

    Have you measured the course of your input voltage?

    Regards,

    Moritz

  • 0 in reply to Moritz.
    Prodigy 40 points

    Hi Moritz,

    Thank you for your answer.

    My understanding was close to it.

    I do not have the access to the design of the power source that is at the input.

    Also, to get some information about the cycling, I will need to buy a evaluation board (TPS63060EVM) and measure how fast the system is re-arming after a shutdown trigger by UVL.
    For sure I will record the behavior of the input voltage.

    Jacques

  • 0 in reply to Jacques Paris1
    TI__Intellectual 1700 points

    Hi Jacques,

    Figure 32 and 33 in the datasheet of the device will give you an idea of how the TPS63061 will recover after that UVL event.

    Getting the evaluation board is a good idea, but keep in mind that the board layout of this and your solution might not be the same.

    best regards,

    Moritz