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INA194: INA194 Power-up Sequence Questoin

Intellectual 2830 points

Replies: 2

Views: 179

Part Number: INA194

Hi Support team experts,

My customer has a question regarding the power-up sequence regarding INA194. If supply of INA194 was established much slower than the input signals, will it cause damage on INA194. E.g. The +12V bus voltage already applied to Vin+ and Vin- but the V+ is still 0V.

Thanks a lot.

Best Regards,

Wei-Hao

  • Hello Wei-Hao,

    Thanks for reaching out on the forum.  The VCM is specified independently of the supply as shown below.  So the device should be able to handle a bus voltage while V+ is 0V.  However, if anything drives the output far from the supply such as a mux or downstream SAR ADC then you could have issues.  also if you have a split ground plane, with the load ground and device ground being different, that also could possibly present conditions that may adversely affect the device.

    Best Regards,

    Patrick Simmons, TI Sensing Products Applications Support

    Getting Started with Current Sensing Video Training Series

    TI makes no warranties and assumes no liability for applications assistance or customer product design. You are fully responsible for all design decisions and engineering with regard to your products, including decisions relating to application of TI products. By providing technical information, TI does not intend to offer or provide engineering services or advice concerning your designs.

  • In reply to Patrick Simmons:

    Hi Patrick,

    Thank you for explanation, it really helps.

    Many thanks.

    Wei-Hao

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