LMV331-N, LMV339-N, LMV393-N
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SNOS018G –AUGUST 1999–REVISED FEBRUARY 2013
The total hysteresis provided by the network is defined as
ΔVa = Va1 - Va2
(3)
To assure that the comparator will always switch fully to VCC and not be pulled down by the load the resistors
values should be chosen as follow:
RPULL-UP << RLOAD
and R1 > RPULL-UP
(4)
(5)
.
Figure 13. Inverting Comparator with Hysteresis
NON-INVERTING COMPARATOR WITH HYSTERESIS
Non inverting comparator with hysteresis requires a two resistor network, 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 up
to Vin1 where Vin1 is calculated by
(6)
When Vin is high, the output is also high, to make the comparator switch back to it's low state, Vin must equal Vref
before VA will again equal Vref. Vin can be calculated by:
(7)
The hysteresis of this circuit is the difference between Vin1 and Vin2
.
ΔVin = VCCR1/R2
(8)
9
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