Part Number: TLV9061-Q1
Other Parts Discussed in Thread: TLV9061
Tool/software:
Hi Team,
Please review this schematic design below and let me know the points that should be modified. There are the current sensing specification in the attachment.
Regards,
Hey Jeffrey,
A couple notes. You have listed your gain as 200, however, since there is no resistance on VOFFSET#1, your gain would be 201. Please note that if you do want to add an offset on VOFFSET#1, you will need to make the parallel combination of R90 and R91 equal to 200k. Alternatively, you can simply attach a 200k resistor and place a buffer amplifier between the 200k resistor and the R91/R90 voltage divider.
I would not include C37 as configured as this will degrade your phase margin. If you must include differential filtering, I would split R60 and R63 into two 500Ohm resistors and place C37 in between them.
Also, are you trying to sense current accurately near 0A? If so, you may need to add a small offset on Voffset to bring the op amp output common mode range within the linear range of the output stage. The amplifier's region of high aol is 50mV from either rail.
Best,
Jerry
Hey Jeffrey
The voltage generated from Voffset is going to cause issues with gain error, and will be sinking a lot of current (~10mA). The best way to implement this is shown below. This accomplishes the comment from my first response.
Please note that if you do want to add an offset on VOFFSET#1, you will need to make the parallel combination of R90 and R91 equal to 200k
Best,
Jerry
