Datasheet

LMV331-N, LMV339-N, LMV393-N
www.ti.com SNOS018G –AUGUST 1999–REVISED FEBRUARY 2013
The total hysteresis provided by the network is defined as
ΔV
a
= V
a1
- V
a2
(3)
To assure that the comparator will always switch fully to V
CC
and not be pulled down by the load the resistors
values should be chosen as follow:
R
PULL-UP
<< R
LOAD
(4)
and R
1
> R
PULL-UP
. (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 (V
ref
) at the
inverting input. When V
in
is low, the output is also low. For the output to switch from low to high, V
in
must rise up
to V
in1
where V
in1
is calculated by
(6)
When V
in
is high, the output is also high, to make the comparator switch back to it's low state, V
in
must equal V
ref
before V
A
will again equal V
ref
. V
in
can be calculated by:
(7)
The hysteresis of this circuit is the difference between V
in1
and V
in2
.
ΔV
in
= V
CC
R
1
/R
2
(8)
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