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INA260: Power on seq. in input power measurement Application

Part Number: INA260

Dear Sir/Ms.

May I ask about the power-on Seq. My customer puts the INA260 on the main input and wants to measure the input voltage and current. In this application INA260, the power-on sequence becomes IN+, IN-, and VBUS. The next step is that VCC will have electricity. Can you tell us about this design? OK or not good?

Best Regards,

Kami Huang

  • Hello Kami,

    Thank you for asking your question on the forum.  This will not be an issue just make sure the register setting are correct before you make make your measurements.  Below is the text from the datasheet that states it will be ok.

    INA260 Datasheet Section 10

    10 Power Supply Recommendations

    The input circuitry of the device can accurately measure signals on common-mode voltages beyond its power supply voltage, VVS. For example, the voltage applied to the power supply terminal (VS) can be 5 V, whereas the load power-supply voltage being monitored (the common-mode voltage) can be as high as 36 V. Note also that the device can withstand the full 0-V to 36-V range at the input terminals, regardless of whether the device has power applied or not.

    Place the required power-supply bypass capacitors as close as possible to the supply and ground terminals of the device. A typical value for this supply bypass capacitor is 0.1 μF. Applications with noisy or high-impedance power supplies may require additional decoupling capacitors to reject power-supply noise.