LMV393DMR2G datasheet(12/19 Pages) ONSEMI

12 / 19 page

LMV331, NCV331, LMV393, LMV339

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VO HIGH

+VCC

VT1

Figure 22.

VO LOW

+VCC

VT2

Figure 23.

Non−inverting Configuration with Hysteresis

A non−inverting comparator is shown in Figure 24.

Figure 24.

+VCC

VREF

−

VIN

RPULL−UP

RLOAD

The hysteresis band (Figure 25) of the non−inverting

configuration is defined as follows:

in + VCCR1 R2

VIN1

VIN2

VIN

VCC

Figure 25.

When VIN is much less than the voltage at the inverting

input (VREF), then the output is low. R2 can then be viewed

as being connected to ground (Figure 26). To calculate the

voltage required at VIN to trip the comparator high, the

following equation is used:

in1 +

ref (R1 ) R2)

When the output is high, VIN must less than or equal to

VREF (VIN

≤ VREF) before the output will be low again

(Figure 27). The following equation is used to calculate the

voltage at VIN to switch the output back to the low state:

in2 +

ref (R1 ) R2) * VCCR1

VA = VREF

VIN2

VO HIGH

+VCC

Figure 26.

VA = VREF

VO LOW

VIN1

Figure 27.

Termination of Unused Inputs

Proper termination of unused inputs is a good practice to

keep the output from ‘chattering.’ For example, if one

channel of a dual or quad package is not being used, then the

inputs must be connected to a defined state. The

recommended connections would be to tie one input to VCC

and the other input to ground.

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