9.2.1.2.2 Overdrive

Slow or inaccurate responses can also occur when the reference pin is not provided enough overdrive voltage. This is the amount of voltage that is higher than the internal virtual reference. The internal virtual reference voltage will be within the range of 1.24 V ±(0.5%, 1.0% or 1.5%) depending on which version is being used.

The more overdrive voltage provided, the faster the TLVH431B-EP will respond. See Figure 30 and Figure 31 for the output responses to various input voltages.

For applications where TLVH431B-EP is being used as a comparator, it is best to set the trip point greater than the positive expected error (that is, +1.0% for the A version). For fast response, setting the trip point to > 10% of the internal V_ref should suffice.

For minimal voltage drop or difference from Vin to the ref pin, it is recommended to use an input resistor < 10 kΩ to provide I_ref.