Other Parts Discussed in Thread: LM7705, BQ76920
Hello;
I need a sanity check regarding the LPV821's power supply capabilities. Because my client's application requires accurately measuring +/- 400A, the sense resistor is 100uOhm to reduce power/heating (inside a sealed enclosure). The 76920's current sense input span is +/- 200mV, and so to use its full range, I've added a x5 gain stage using 2 821's. Doing so requires the "CHG" amplifier to drive SRN 200mV below ground.
My TI FAE (Antonio Fadhel) suggested the LM7705 precision bias generator, which outputs -0.23V. My intent is to bias the LPV821's VSS to -230mV which should (?) allow it to drive SRN to -200mV.
However, I need a sanity check as to the 821's ability to do so, and this dual supply configuration. I'd appreciate any suggestions/comments/corrections
Thanks!
I