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INA196A-Q1: Enquiry on INA196A

Poh Kok Keng
Genius 5112 points
Part Number: INA196A-Q1

Dear Sir/Madam,

I am looking at the following issues that might affect the increase in current measurement but I would like to be certain we are going at the correct path.

  1. The INA196A datasheet requirement 0.1uF decoupling capacitor. Without this what will be the effect at the INA196A output? Will this reflect the noise at the INA196A OUT?
  2. Battery relay/ open close current inrush current during relay on. Datasheet of INA196A at VIN+ is 5mA only. Measured inrush current can surge up to 600mA. Will this damage the component?
  3. Use of transzorb in some of TI Current sense applications? will this advisible?

Here is my test result, you can see the current failures are above the test limits and within the TI spec.


 


 

 


 

Hope to hear from you soon.

 

Best regards,

kpk

  • 0
    TI__Mastermind 21805 points
    Hello Poh Kok Keng,

    Thanks for considering to use Texas Instruments.

    1. The decoupling capacitor is standard practice recommended by TI to ensure that your device has a stable supply. Without a decoupling capacitor, any transients that occur on the rail will be seen on the output. This is in accord with the PSRR specification.
    2. Any absolute maximum rating that is violated including current above 5mA into any pin will damage the part. Were you measuring your current through the bus trace leading to the shunt and VIN+ trace or are you measuring through the VIN+ trace into the device?
    3. A transzorb is advisable if you expect your common mode voltage to go below -16V or above 80V. From your posted measurements, I do not think it will help you.