BQ34Z100-G1: High current BMS design

PRABHAT RANJAN TRIPATHI

Part Number: BQ34Z100-G1
Other Parts Discussed in Thread: TIDA-00445, , OPA2376

Can I use TIDA-00445 reference design as a replacement for current sensor in BQ34Z100-G1, for high current applications?

If yes, then how low can be the shunt resistor value in TIDA-00445?

over 3 years ago

0 Wyatt Keller over 3 years ago

TI__Guru** 102375 points

Hello,

As long as you input some scaled version of the current that matches the gauges it should work. You would need to reference the parts in that reference design for the minimum sense resistor that could be used, it would really depend on the current you're trying to measure and the voltage range the op amps are capable of.

Sincerely,

Wyatt Keller

0 PRABHAT RANJAN TRIPATHI over 3 years ago in reply to Wyatt Keller

Intellectual 701 points

I want to use OPA2376, with a 50 micro ohm resistor "WSBS8518L0500JK" to measure a peak current of 120 Amps and feed it to BQ34Z100-G1, SRP and SRN pins.

Is it a viable solution?

0 Wyatt Keller over 3 years ago in reply to PRABHAT RANJAN TRIPATHI

TI__Guru** 102375 points

Hello,

I would make a new thread post with the op amp linked so it goes directly to the OPA team. I think it may have some challenges to measure such a low sense resistor with noise, but it should be possible. We can't confirm anything because this is out of the spec.

Sincerely,

Wyatt Keller

0 PRABHAT RANJAN TRIPATHI over 3 years ago in reply to Wyatt Keller

Intellectual 701 points

where can I find the new thread?

0 Wyatt Keller over 3 years ago in reply to PRABHAT RANJAN TRIPATHI

TI__Guru** 102375 points

Hello,

Make a new E2E thread and link the OPA2376. I think this could work but would require testing to make sure there's no unexpected issues.

If you work with high load transients slew rate may be an issue for the gauge to calculate the real current passed. The voltage would need to exactly match what the gauge is expecting to see with your scale factor so the gain must be very linear.

Sincerely,

Wyatt Keller

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BQ34Z100-G1: High current BMS design