For the TLV3603-Q1, the hysteresis vs. resistance curve (Figure 8-2) can be used as a guidance to set the desired amount of hysteresis. Figure 8-2 shows that for a 30-mV hysteresis, a 150 kΩ resistor must be placed from the LE/HYS pin to VEE.
For the TLV3601-Q1 and TLV3602-Q1, the following procedure can be used to add external hysteresis for a non-inverting configuration. Note that VHYST << VREF, so VHYST can be ignored and is not included in the following equations for simpler calculation.
The equivalent resistor networks when the output is high and low are shown in Figure 8-7.
When VIN is less than VREF, the output is low. For the output to switch from low to high, VIN must rise above the VH threshold. Use Equation 1 to calculate VH.
When VIN is greater than VREF, the output is high. For the comparator to switch back to a low state, VIN must drop below the VL threshold. Use Equation 2 to calculate VL.
The hysteresis of this circuit is the difference between VH and VL, as shown in Equation 3.
Select a value for R2. Plug in given values for VCC, VREF, VH, and VL. For the given example, R2 = 10 kΩ, and R1 is solved as 60 Ω.
For more information, please see Application Notes SNOA997 "Inverting Comparator with Hysteresis Circuit", SBOA313 "Non-Inverting Comparator With Hysteresis Circuit", SBOA219 "Comparator with and without hysteresis circuit".