TLV1811 datasheet(19/46 Pages) TI1

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VA = VREF

VO High

+VCC

VA = VREF

VO Low

+VIN1

VIN2

Figure 9-6. Non-Inverting Configuration Resistor Networks

When VIN is less than VREF,, the output is low. For the output to switch from low to high, VIN must rise above the

VIN1 threshold. Use Equation 4 to calculate VIN1.

= R1

IN1

VREF

+ VREF

(4)

When VIN is greater than VREF, the output is high. For the comparator to switch back to a low state, VIN must

drop below VIN2. Use Equation 5 to calculate VIN2.

IN2

REF

(R1 + R2)

(5)

The hysteresis of this circuit is the difference between VIN1 and VIN2, as shown in Equation 6.

DV = V

(6)

For more information, please see Application Notes SNOA997 "Inverting comparator with hysteresis circuit" and

SBOA313 "Non-Inverting Comparator With Hysteresis Circuit".

9.1.2.3 Inverting and Non-Inverting Hysteresis using Open-Drain Output

It is also possible to use an open drain output device, such as the TLV182x, but the output pull-up resistor must

also be taken into account in the calculations. The pull-up resistor is seen in series with the feedback resistor

when the output is high. Thus, the feedback resistor is actually seen as R2 + RPULLUP. TI recommends that the

pull-up resistor be at least 10 times less than the feedback resistor value.

9.2 Typical Applications

9.2.1 Window Comparator

Window comparators are commonly used to detect undervoltage and overvoltage conditions. Figure 9-7 shows a

simple window comparator circuit. Window comparators require open drain outputs (TLV182x) if the outputs are

directly connected together.

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TLV1811, TLV1821, TLV1812, TLV1822, TLV1814, TLV1824

SNOSDC8C – SEPTEMBER 2022 – REVISED SEPTEMBER 2023

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TLV1811 Datasheet(PDF) 19 Page - Texas Instruments