We understand that LM2903 requires VCC > VICR + 2.0V ( VCC > VICR + 1.5V @ room temp) to guarantee the device operation in full temperature range. I believe the device internal current source needs this voltage to work correctly. However, could you please tell us the output behavior when this condition is not met ?
Our customer had tested the operation at below schematic.
When customer decreased the VCC voltage down to VCC < VICR +1.5V, VOUT had switched from HIGH to LOW level even IN+ > IN-.
VCC = 2.5V were the threshold when VICR was 1.75V. VCC - VICR = 0.75V
However, instead of decreasing VCC, they increased VICR (by increasing IN+ voltage) to 3.0V at VCC=3.3V. As a result, VOUT kept HIGH level even VCC - VICR = 0.30V
How come the threshold is different even using the same sample ?
If VCC > VICR + 1.5V, can you commit LM2903 would always output the correct output level ?