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INA214: OUTPUT current

David Zhao
Intellectual 1820 points
Part Number: INA214

Hi

My customer adopts INA214B as below. When INA 214 output is 7V, the input of MUX is still clamped at 3.6V. Then the current will be 17mA. Is this current ok for INA214B output? Thanks!

Regards

David

  • 0
    TI__Expert 4915 points

    Hi David,

    Thank you for posting on the E2E forums.

    Figure 10 on the Electrical characteristics section shows a voltage drop of V+ (-3V) at 25C or V+ (-2V) at 8mA sourcing 20 and 8mA respectively. There is an error on that graph, which I asked to be revised. There are two lines of the same colour. The lower is for VS of 5V and the higher is for VS up to 26V, which applies to your case, given the output voltage.

    So, in reality you wont see the full 17.5mA. More like 10-15mA depending on the device temperature, since the 200 Ohm resistor adds up with the internal output impedance.

    This current is fine as a transient and may very likely be fine under a continuous loading, but we don't test this when characterising our devices. So two more questions:

    How long do you plan for the output to be clamped by the MUX? Is this expected to be a transient or a continuous operation?
    Can the INA214 be supplied from a lower voltage such as 5V so that the output current is minimised?