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LM2903 Datasheet(PDF) 10 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) 10 Page - 3PEAK INC.

 
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10
LM2903/LM2901
36V Low Power Dual/Quad Differential Comparators
Rev. B
www.3peakic.com.cn
1
C
4
R
ln2
2
1
Freq
Vo
R3
R2
VDD
R1
LM393
R4
C1
VC1
t
VO
R1=R2=R3
2/3VDD
1/3VDD
t
VC1
VA
Figure 7. Relaxation Oscillator
Windowed Comparator
Figure 8 shows one approach to designing a windowed comparator using a single LM2903/2901 chip. Choose
different thresholds by changing the values of R1, R2, and R3. OutA provides an active-low undervoltage
indication, and OutB gives an active-low overvoltage indication. ANDing the two outputs provides an active-high,
power-good signal. When input voltage Vi reaches the overvoltage threshold VOH, the OutB gets low. Once Vi falls
to the undervoltage threshold VUH, the OutA gets low. When VUH<Vi<VOH, the AND Gate gets high.
1
)/R
3
R
2
R
1
(R
r
V
OH
V
)
2
R
1
)/(R
3
R
2
R
1
(R
r
V
UH
V
OutA
+InB
+InA
-InB
-InA
LM2903
OutB
UnderVolt
OverVolt
Power
Good
AND
Gate
Vr
R3
R1
Vi
R2
Figure 8. Windowed Comparator


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