REF3312 datasheet(12/24 Pages) TI1

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+5 V

LOAD

1 MW

REF

+2.5 V

5 V

0 V

1.675 V

3.325 V

IN2

O High

V = V

REF

330 kW

O Low

IN1

V = V

REF

IN1

IN2

DV = V

IN2

REF

(R1 + R2)

= R1

IN1

VREF

+ VREF

TLV3691

SBOS694 – DECEMBER 2013

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Noninverting Comparator with Hysteresis

A noninverting comparator with hysteresis requires a two-resistor network, as shown in Figure 30, and a voltage

reference (VREF) at the inverting input. When VIN is low, the output is also low. For the output to switch from low

to high, VIN must rise to VIN1. VIN1 is calculated by Equation 4:

(4)

When VIN is high, the output is also high. In order for the comparator to switch back to a low state, VIN must drop

to VIN2 such that VA is equal to VREF. VIN2 can be calculated by Equation 5:

(5)

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

(6)

Figure 30. TLV3691 in a Noninverting Configuration with Hysteresis

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REF3312 Datasheet(PDF) 12 Page - Texas Instruments

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