MC33030
http://onsemi.com
13
20 k
20 k
For 60 Hz R = 53.6 k, C = 0.05
V
in
20 k
7
8
V
B
R
2
R
3
R
4
V
A
R
C
R/2
2C
C
R
8
7
6
Figure 25. Notch Filter Figure 26. Differential Input Amplifier
Error Amp
Error Amp
−
9
R
1
6
+
9
−
+
20 k
f
notch
+
1
2pRC
V
Pin6
+ V
A
ǒ
R
3
) R
4
R
1
) R
2
Ǔ
R
2
R
3
–ǒ
R
4
R
3
V
B
Ǔ
R
1
R
R
V
Ref
R + DR
R
V
B
6
20 k
R
2
Set
Temperature
Cabin
Temperature
Sensor
V
CC
R
4
R
3
R
2
T
R
1
V
CC
1
6
7
8
8
7
V
A
20 k
20 k
20 k
Figure 27. Temperature Sensing Servo System
−
R
4
−
Error Amp
+
9
+
Error Amp
In this application the servo motor drives the
heat/air conditioner modulator door in a duct system.
9
R
3
V
Pin6
+
R
4
R
3
(V
A
–V
B
)
V
Pin6
+
V
CC
ǒ
R
4
R
3
) 1Ǔ
ǒ
R
1
R
2
) 1
Ǔ
V
A
* V
B
+ V
Ref
ǒ
DR
4R ) 2DR
Ǔ
R
1
+R
3
, R
2
+ R
4
, R
1
uu R
Figure 28. Bridge Amplifier
C
DLY
16
4.7 k
V
CC
LM311
R
OC
15
7
1
8
4
2
3
V
Ref
V
in
+
O.C.
R
SQ
7.5 V
470
A
D
2
D
1
D
1
Q
R
E
D
2
R
E
Figure 29. Remote Latched Shutdown
V
CC
Motor
A direction change signal is required at Pins 2 or 3 to
reset the overcurrent latch.
R
E
[
V
F(D
1
)
)V
F(D
2
)
–V
BE(ON)
I
MOTOR
–I
DRV(max)
+
B
This circuit maintains the brake and overcurrent
features of the MC33030. Set R
OC
to 15 k for
I
DRV(max)
≈ 0.5 A.
From Drive
Outputs
Figure 30. Power H−Switch Buffer
