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LM2903 Datasheet(PDF) 6 Page - 3PEAK INC.

Part No. LM2903
Description  36V Low Power Dual/Quad Differential Comparators
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Maker  3PEAK [3PEAK INC.]
Homepage  http://www.3peakic.com/
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LM2903 Datasheet(HTML) 6 Page - 3PEAK INC.

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6
LM2903/LM2901
36V Low Power Dual/Quad Differential Comparators
Rev. B
www.3peakic.com.cn
voltages that exceed supply voltages, as shown in Figure 2. Large differential voltages exceeding the supply
voltage should be avoided to prevent damage to the input stage.
Chip
1KΩ
1KΩ
Core
+In
-In
Figure 2. Equivalent Input Structure
External Hysteresis
Greater flexibility in selecting hysteresis is achieved by using external resistors. Hysteresis reduces output
chattering when one input is slowly moving past the other. It also helps in systems where it is best not to cycle
between high and low states too frequently (e.g., air conditioner thermostatic control). Output chatter also
increases the dynamic supply current.
Non-Inverting Comparator with Hysteresis
A non-inverting comparator with hysteresis requires a two-resistor network, as shown in Figure 3 and a voltage
reference (Vr) at the inverting input.
Vr
Vi
Vo
R1
R2
Vr
Vtr
Vo
R1
R2
V+=Vr
Vr
Vtf
Vo
R1
R2
V+=Vr
VDD
LM393
LM393
LM393
Figure 3. Non-Inverting Configuration with Hysteresis
When Vi is low, the output is also low. For the output to switch from low to high, Vi must rise up to Vtr. When Vi is
high, the output is also high. In order for the comparator to switch back to a low state, Vi must equal Vtf before the
non-inverting input V+ is again equal to Vr.
tr
V
R2
R1
R2
r
V
tf
V
2
1
1
)
tf
V
DD
(V
r
V
R
R
R
r
V
R2
2
1
tr
V
R
R 


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