The equivalent resistor networks when the output is high and low are shown in Figure 8-7.

R1

VA = VREF

VO High

VCC

R2

R2

VA = VREF

VO Low

VH

R1

VL

Figure 8-7. Equivalent Resistor Networks for Non-Inverting Configuration with Hysteresis

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.

VH = (R1 x VREF/R2) + VREF

(1)

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.

VL = [VREF (R1 + R2) - VCC x R1] / R2

(2)

The hysteresis of this circuit is the difference between VH and VL, as shown in Equation 3.

ΔVIN = VHYS = (VCC x R1/R2)

(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".

8.2.1.3 Application Curve

VIN (V)

Figure 8-8. Hysteresis Transfer Curve using TLV3601/TLV3603

TLV3601, TLV3602, TLV3603, TLV3603E

SNOSDB1E – JUNE 2021 – REVISED APRIL 2023

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