Datasheet

MC34071,2,4,A MC33071,2,4,A, NCV33072,4,A
http://onsemi.com
15
Figure 50. Low Input Voltage Comparator
with Hysteresis
Figure 51. High Compliance Voltage to
Sink Current Converter
Figure 52. High Input Impedance
Differential Amplifier
Figure 53. Bridge Current Amplifier
Figure 54. Low Voltage Peak Detector Figure 55. High Frequency Pulse
Width Modulation
V
ref
R2
V
O
V
OH
V
OL
V
inL
V
inH
V
ref
Hysteresis
V
in
V
in
R1
MC34071
V
inL
=(V
OL
-V
ref
)+V
ref
R1
R1+R2
V
inH
=(V
OH
-V
ref
)+V
ref
V
H
=(V
OH
-V
OL
)
+
-
R1
R1+R
R1
R1+R2
V
in
I
out
R
-
+
I
out
=
V
in
±V
IO
R
1/2
MC34072
-
+
+
R1 R2
R3
R4
V
O
+V1
+V2
R2 R4
R3R1
(Critical to CMRR)
V
O
= 1 V2-V1
For (V2 ≥ V1), V > 0
=
-
+
R4
R3
R4
R3
-
+
+V
ref
R
F
V
O
RR
R
R = DR
DR < < R
R
F
> > R
(V
O
≥ 0.1 V)
R
F
V
O
= V
ref
DR R
F
2R
2
-
+
V
in
V
in
R
L
V
P
10,000 pF
V
O
= V
in
(pk)
+
V
P
t
-+
+
V
P
t
t
I
out
V
P
+
-
0
+
I
SC
Base Charge
Removal
±I
B
V+
47 k
100 k
C
R
Pulse Width
Control Group
OSC
Comparator
High Current
Output
f
OSC
^
V
0.85
RC
-
100 k
I
B
MC34071
MC34071
MC34071
1/2
MC34072
1/2
MC34072
1/2
MC34072