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INA214: INA214 output bump when Vcc drops.

Harry Ma
Intellectual 2060 points
Part Number: INA214

Tool/software:

Customer using INA214 on high side to sense output current. the output voltage is 12V and shunt resistor is 0.1mohm. 

they found that when they increase the load current to 170A, the INA214's output will occurs a bump which will trigger their OCP point. and before this bump, the Vcc of INA214 will drops slowly to 10.8V

The following is the waveform of: Channel 1:12VCS(INA214 OUTPUT), Channel 2: 12vaux(VCC of INA214), Channel 3 & 4: INA+ & INA-.

Can you help to show your insight what's the possible reason of this bump? and what we should do next step.

  • 0
    TI__Expert 5970 points

    Hello,

    Harry Ma said:
    Can you help to show your insight what's the possible reason of this bump?

    Can you show me exactly when the ocp trigger occurred on the plot? It looks to me like the the ocp already happened before the "bump" (notice the voltages at the input pins begin rapidly decreasing as the bump occurs), so the ocp is probably being triggered by the noise spikes on the output instead of the bump. Improving the input filter is probably the best way to solve this issue. Could you share what the input filter resistor values are? (R363 and R364).

    Harry Ma said:
    Vcc of INA214 will drops slowly to 10.8V

    If the supply of the part is dropping it may indicate a problem with the circuitry that supplies the INA214.

    Thanks,

    Levi DeVries