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TPS563202: Current limit

David Huang
Intellectual 2285 points
Part Number: TPS563202

Hi Team,

My customer is using the device in the following environment as a test.

Vin：11.4V、12.0V、12.6V

Vout：5.0V

Iout：0A~Over current condition (with electronic load）

Temp：80℃

They reported current limit was observed at around 2.33A instead of 3.3A mentioned in the datasheet, with the inductor current as below.

The device's current limit back to 3.3A under room temperature.

Does the ambient temperature affect the current limit value? I only see the datasheet test condition was junction temperature -25C to 125C.

Regards

  • 0
    TI__Expert 4360 points

    Hi David

    My colleague will check it and give you a feedback early tomorrow, thanks!

  • 0
    TI__Expert 3900 points

    Hi David,

    1. Ambient temperature does affect the current limit value, but it won't have such a big impact, like the customer.

    2. The following figure is the chip validation test result for you to reference.

    3. It is recommended that customers check whether the setup is disturbed, and test more chips to see if it is a common problem?  Please also add Vout and SW waveforms. 

                                            picture.1

    Best Regards,

    Zhou

  • 0 in reply to Harry Zhou
    TI__Intellectual 2285 points

    Hi Zhou,

    Thanks for the response!

    I just checked with the customer, and for your questions:

    Harry Zhou said:
    It is recommended that customers check whether the setup is disturbed, and test more chips to see if it is a common problem?  Please also add Vout and SW waveforms. 

    Below is the Vout and SW pin waveform, the customer mentioned that they've done the experiment on 2 chips and both appeared to have the same issue. After setting the temperature back to 25℃、-10℃ the issue was solved.

    I thought the issue was caused by the Vin, but the customer was using following setup and the Vin seems to be irrelevant.

    Is there anything else that could've caused this issue?

    Regards,

  • 0 in reply to David Huang
    TI__Expert 3900 points

    Hi David，

    1. Based on the above waveform, it cannot be judged that the chip has been triggered the OC protection, because the SW is still produce pluses.
    2. According to the customer's description, when testing at 80°C, if the load is gradually increased, the chip may trigger OT protection.

    Best Regards,

    Zhou