SLVS905B December 2008 – July 2024 TLV431A-Q1 , TLV431B-Q1
PRODUCTION DATA
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 is within the range of 1.24V ±(0.5% or 1.0% ) depending on which version is being used.
The more overdrive voltage provided, the faster the TLV431 responds. This can be seen in figures Figure 8-3 and Figure 8-4, where the images display the output responses to various input voltages.
For applications where TLV431 is being used as a comparator, set the trip point to greater than the positive expected error (i.e. +1.0% for the A version). For fast response, set the trip point to > 10% of the internal Vref.
For minimal voltage drop or difference from Vin to the ref pin, TI recommends using an input resistor < 10kΩ to provide Iref.