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TIDA-01608: TIDA-01608 - Current measurement on a 12V Vehicle battery for various load conditions

Part Number: TIDA-01608
Other Parts Discussed in Thread: INA260, INA226-Q1, INA239-Q1

 Hi,

I am developing an application to measure the current from a 12V Vehicle battery  in different load conditions,

the voltage will be in between +11 V to 13V maximum   ut the load may vary from 10W to 500W 

I would like to use the above reference for the same the load current may vary up to 10A max so can I use the above TIDA-01608 reference to measure the power?

or is there an alternative reference for the same?

Please provide your feedback ASAP

With Regards,

Rakesh hegden M N

 

  • Rakesh, thanks for using E2E!

    Is the top end of the expected load current here pulsed, or a potential constant 500W?

    From an error standpoint, the design should work fine, and deliver the expected accuracy. However, at the power levels you discuss, the largest issue here would be ensuring that the device's short circuit duration timing is met:

    From what you mentioned above, it looks like your worst case condition would be a current of around 42A, to achieve 500W of output power. This graph shows that for a current of 40A, the INA260 can only sustain this for about 2-3 seconds before suffering damage. If the load current is expected to be a constant time greater than this, I would advise against using the INA260 here, in any sense of application due to this constraint. 

    I would recommend using a similar setup as TIDA-01608, but swapping out the INA260 for either INA226-Q1 or the new INA239-Q1, where the shunt sits exterior to the device and serves as a degree of freedom for your system to dial in the error and thermal considerations. 

    Let me know if this makes sense. 

  • Hi Thank You for the feedback,

    Since we can't handle 500W continues current (42A), I was planning to add 10W,20W,35W, and 50W loads maximum (either any of the one or collectively(Max load will not be more than 115W))

    In this condition can I measure the current using the design?

    Here is my requirement, Kindly suggest if any best solution you have  

    I have to connect the vehicle battery with different load conditions to discharge and need to measure the current flow (10W,20W,35W, and 50W loads maximum (either any of the one or collectively(Max load will not be more than 115W))). Also, charge the battery with 10A power supply and measure the current 

    Can you please suggest the best reference design by which I can able to achieve the same?

    With Warm Regards,

    Rakesh Hegden MN

  • Rakesh,

    The INA260 is capable of sustaining 15A of current through the device continuously. From the loads you've specified, it would seem like this would operate well under this limitation, even under max load, but you would not be able to do the original 500W you mentioned. As the device is bidirectional, you would need to configure the registers for this, but the 10A charging current should be measurable as well.