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Original question:

TPS62060: Current limit and the operation after current limit reached

TPS62060: TPS62060 Power Up

Samson P1
Prodigy 100 points
Part Number: TPS62060
Other Parts Discussed in Thread: TPS62811M

Hi,

We have implemented TPS62060 device in our design. Vin=3.3V, Vout =1V

While Power ON we see an Inrush current of 2.6A for apprx.150uS. But our load current has to be apprx. 900mA

Can anyone help us on this?

Why does device shows such a high current?

When we have a capacitive load of 470uf it shows 2.6A and when we reduce the capacitive load to 340uf it shows the same Inrush current value.

Please support on this issue.

Regards,

Samson

  • 0
    TI__Expert 7585 points

    Hi Samson,

    Thanks for your question.

    The current value that you have described seems reasonable for your application.

    If you look on the datasheet in the Soft Start description, you will see that the device tries to ramp up the output voltage in 250us.

    Once 1/3 of the nominal output voltage has been reached, the device will output the maximum current possible and try to charge COUT to follow the internal reference ramp up. (this value is limited by the Mosfet current limit, in your case 2.6A). Can you confirm if you see a similar behavior in your application?

    I believe that the main problem is the huge output capacitance. This would lead to an huge inrush current necessary to ramp up VOUT in the defined ramp time.  Is there any way to reduce it, or is it defined by the load?

    If you look at the Recommended Operation Conditions, the max recommended output capacitance for TPS62060 is 22uF.

    As a general comment, TPS62060 is an old device and I would not recommend it for new applications. 

    You can take a look at newer devices as TPS6281xM, TPS6285x and  TPS6282x family to see if they are compatible with your application.

    In particular, TPS62811M can support up to 470uF output capacitance and it has an adjustable soft start time, that would help to greatly reduce the inrush current.

    Thanks,

    Stefano