TLV9032DDFR.A datasheet(27/85 Pages) TI2

27 / 85 page

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.

VIN1=R1×VREFR2+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.

VIN2=VREFR1+R2 −VCC×R1

(5)

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

ΔVIN=VCC×R1R2

(6)

For more information, see the Inverting comparator with hysteresis circuit application note" and Non-Inverting

Comparator With Hysteresis Circuit application note.

7.1.2.3 Inverting and Non-Inverting Hysteresis Using Open-Drain Output

An open drain output device, such as the TLV902x, can also be used, 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.

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 (TLV902x) 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

7.2.1.1 Design Requirements

For this design, follow these design requirements:

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