Other Parts Discussed in Thread: TLV9101, OPA990, TL081H
Hi, this is my new thread in relation of my other thread (OPA170 Abnormal Behaviour).
My setup (use as current sensor : V2 connecting V3 with ~0.1 ohm;150C test)
V1 = 12V, V3=13.5V and if there is a short circuit, V2 will reduce until the different ~120mV. this voltage will feed into my next comparator set at 0.5V to trigger next circuit.
based on differential calculation, Vout should be ~0.6V however this is not the case, based on previous thread.
Since Vin for OPA170 unable to extend from (V+)-2V and V+, the new Rf will be drop to 80k with gain ~2 @ Vout=0.24V.
so the question are :
1. Is there any recommendation to increase the gain further back to > 5 ? need simple solution as i have comparator at next stage.
2. OPA990 or TLV9101 will be good for rail-to-rail Vin but it did not fit temperature requirement,150C. Any other 150C rail-to-rail Vin suggestion?