LM339LVDR datasheet(25/71 Pages) TI2

25 / 71 page

VA = VREF

VO High

+VCC

*R2

VA = VREF

VO Low

+VIN1

VIN2

* R2 = R2 + RPU

Figure 7-6. 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".

7.2 Typical Applications

7.2.1 Window Comparator

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

a simple window comparator circuit. Window comparators require open drain outputs if the outputs are directly

connected together.

Micro-

Controller

3.3 V

Sensor

10 0Ÿ

RPU

UV_OV

Open Drain Output Only!

VTH-

VTH+

VIN

Low when VIN < VTH-

Open Drain Output Only!

Output high

when VIN is

within window

10 0Ÿ

Low when VIN > VTH+

Figure 7-7. Window Comparator

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TL331LV, TL391LV, LM393LV, LM339LV

SNOSDA4D – JUNE 2020 – REVISED NOVEMBER 2023

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