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TPS2115A: Current value under recommended operating conditions

Part Number: TPS2115A

Hello,

I would like to ask you about the TPS2115A device.
The attached waveform is a monitor of the current flowing through this device.
Average current is 1.38A, but momentary 2.06A.
(question)
The recommended operating conditions listed in the datasheet include a description of MAX 2A.
Is this number an RMS value?
Or is it pure DC current?
I am concerned that there is a problem because it may exceed 2A momentarily.
Please let me know how the current is defined in the spec.

Best regards,

  • Hello, 

    Could you provide what Rilim value you are using to set your current limit? 

    Best Regards, 

    Elizabeth 

  • Thank you for your reply.
    I'm an FAE for a TI product distributor and this question came from a customer of mine.
    RILIM is thinking of setting 180Ω.
    It is a calculation that exceeds the current limit of 2A, but we plan to control the current in the subsequent circuit.

    My circuit is not going to exceed the recommended operating condition of 2A.
    Therefore, I would like to know the concept of the maximum current of 2A in the specifications.

    Since it is a current value, I think that the temperature rise due to the heat generated by the internal resistance of the device is the limit.
    So, should I consider the RMS value equivalent to 2A?

    Best regards,

  • Hello, 

    We recommend the current limit adjusted range to be within the bounds noted below and in the datasheet: 

    The device can handle an absolute maximum continuous output current rating of 2.5A, but TI can only guarantee operation and functionality within the recommended operating conditions. 

    Based on your RILIM of 180ohms, your customer is setting a ILIM of around 2.78A. To be within our recommended operation range, this resistor would need to be less than 250ohms. 

    Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. Operation in the abs max range is additionally not ideal as there could be significant variation(timing, on resistance, response to inputs, etc) from datasheet specifications as these were characterized under the recommended operating conditions. 

    Is there a reason the customer is not setting the current limit to less than 2A if the average current is1.38A? 

    I would recommend setting the current limit to below 2A and the transient moments of larger than 2A behavior will be limited and not affect the device. 

    Best Regards, 

    Elizabeth