INA4235: Low current sense negative voltage -15V

TIDA-00313 just uses two different supplies and isolation.

You can simply replace the INA226 with any other chip.

Hello Appreciated Engineer,

Clemens is correct. Actually any amplifier’s (or IC) supply voltage can be floated up or down with respect to the input common mode voltage by using a Zener regulator in reverse breakdown and some resistance (Rz) to drop the rest of the voltage in between ground and high (or negative) voltage rail. The primary downside is the power dissipated/lost through Rz.

You just need to make sure that Rz is not too high or else amplifier supply current (along with Zener leakage) will cause a larger voltage drop and may affect Zener’s voltage stability in reverse breakdown mode.

After this, it is a matter of isolating (easier option) or level shifting output/communication pins before connecting to ground references circuitry.

Hope this helps

Sincerely,

Peter