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Original question:

INA240-Q1: the function of PWM rejection

INA240-Q1: PWM rejection and common mode voltage

Balakeishnan K
Prodigy 40 points
Part Number: INA240-Q1

Tool/software:

I am using the IC with 2.048V reference. While doing over voltage test, there is a sudden rate of change of voltage at the input of IC. While doing so, the output is getting stuck at a particular voltage (let say 3.2V).

1. What is the maximum dv/dt is allowed at the input of INA240-A2? 

2. What could be the expected output when the Common mode voltage exceeds 80V?

  • 0
    TI__Intellectual 2635 points

    Hi Balakeishan,

    Can you please provide more information about the test you are running:

    - What is your supply voltage?

    - At what rate are you sweeping the voltage?

    - Do you have a scope shot of the Vout getting stuck?

    1. Figures 7-21 and 7-22 from the datasheet show the transient response of the device for a step in VCM. 

    2. We do not spec devices outside of our recommended operating conditions, and for our recommended operating conditions the VCM is not to exceed 80V. If you are to exceed this 80V we do not guarantee that the device will operate according to the datasheet specs, but the device is not at risk of sustaining damage until the Absolute Maximum ratings are violated, which for the VCM is any value greater than 90V. Please see the screenshots from the datasheet given below.

    Best,

    Holly

  • 0 in reply to Holly R
    Prodigy 40 points

    Hi,

    The dv/dt is around 400V/ms.

  • 0 in reply to Balakeishnan K
    TI__Intellectual 2635 points

    Hello,

    We do not have a specified maximum dv/dt that the input can handle; there is theoretically no limit.

    If you can provide more information about your system, test setup, and scope shots about the error you are seeing I can try to help more.

    Best,

    Holly