SNOSDE7B December 2022 – September 2024 TLV1851 , TLV1861
PRODMIX
The basic comparator configuration may produce a noisy "chatter" output if the applied differential input voltage is near the comparator's offset voltage. This usually occurs when the input signal is moving very slowly across the switching threshold of the comparator. This problem can be prevented by adding external hysteresis to the comparator.
Since the TLV185x and TLV186x devices only have a minimal amount of internal hysteresis of 2.7mV, external hysteresis can be applied in the form of a positive feedback loop that adjusts the trip point of the comparator depending on its current output state.
The hysteresis transfer curve is shown in Figure 7-2. This curve is a function of three components: VTH, VOS, and VHYST:
For more information, please see Application Note SBOA219 "Comparator with and without hysteresis circuit".