INA296A-Q1: INA296A2QDDFRQ1

jugn jung

Part Number: INA296A-Q1

Tool/software:

I have a question. We will fix the VREF voltage at 2.5V in the INA296A2QDDFRQ1 product. We plan to run 2.5V (10K 10K voltage distribution) using DCDC BUCK 5V output voltage. In this case, can I connect it like a data sheet?

VCC=5V 10K 10K resistors were connected to REF2 and REF1

1 month ago

0 Luke Park 1 month ago

TI__Prodigy 485 points

Hi, Team

Customer wants to set OUT to be 0V~5V(Vs) in bidirectional system and reference to be 2.5V.

Please recommend and review the schematic. Thanks.

0 Clemens Ladisch 1 month ago in reply to Luke Park

Guru 280970 points

The 10k resistors will be loaded by the curernt through the internal resistor network, so this will not work. The REF pins must be connected to low-impedance voltage references.

The INA296A-Q1 has two REF pins with a voltage divider to allow such an application. Connect one REF to VCC, and the other to GND. (The internal resistors are likely to be better matched than your external ones.)

0 jugn jung 1 month ago in reply to Clemens Ladisch

Prodigy 30 points

Like that part 
Is it okay to reflect it?

VCC=5V.
REF1 was connected to VCC, and REF2 was connected to GND.

In this case, the reference voltage is fixed to 2.5V.

That is, when the shunt resistance is 1m ohm. 

1m ohm * -20A (charge) * 20(GAIN) +2.5(REF) = 2.1V.

1m ohm * 20A)(discharge) *20 (GAIN)+2.5(REF) = 2.9V.

0 Clemens Ladisch 1 month ago in reply to jugn jung

Guru 280970 points

This schematic looks OK.

0 Javier Contreras4 1 month ago in reply to Clemens Ladisch

TI__Mastermind 29570 points

Agreed.

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INA296A-Q1: INA296A2QDDFRQ1