LM339 데이터 시트보기 (PDF) - Estek Electronics Co. Ltd
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LM339 Datasheet PDF : 6 Pages
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Typical Applications Circuit
LM339
Vin
+ VCC
+ VCC
R3
10k
±
Rref
+
10 k
VO
R2
Vref
10k
R1
1.0M
Vref
≈
VCCR1
Rref+ R1
≈ R1/ / Rref/ / R2
VH =
R1/ / Rref
R1// Rref+R2
[VO(max) -VO(min)]
Rref/ / /R1
Figure 11. Inverting Comparator
with Hystersis
+ VCC
Rref
Vref
10k
R1
R2
Vin
10k
±
+
R3
1.0M
VO
Vref =
VCCR1
Rref+ R1
R2≈ R1/ / Rref
Amount of Hysteresis VH
VH =
R2
R2+ R3
[(VO(max)
-
VO(min)]
Figure 2 . Noninverting Comparator
with Hysteresis
VCC
Vin
RS
+
RL
V ref
±
R1
RS = Source Resistance
R1 ≈ RS
Logic
Device
VCC
RL
(V)
kΩ
CMOS 1/4 MC14001 +15 100
TTL 1/4 MC7400 +5.0 10
Figure 3. Driving Logic
VCC. 4.0V
10k
100k
VCC
R1
+
±
C
+
R2
R3
330k
330k
R4 330k
VO
VCC
T1
T2
T1=T2= 0.69RC
7.2
f = C(µF)
Figure 4 . Squarewave Oscillator
R2=R3= R4
R2// R3// R4
BEIJING ESTEK ELECTRONICS CO.,LTD
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