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MC33030P View Datasheet(PDF) - ON Semiconductor

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Description
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MC33030P
ON-Semiconductor
ON Semiconductor ON-Semiconductor
MC33030P Datasheet PDF : 17 Pages
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MC33030
It must be remembered that points V1 through V4 always
try to follow and center about the reference voltage setting
if it is within the input common−mode voltage range of
Pin 3; Figures 4 and 5. Initially consider that the feedback
input voltage level is somewhere on the dashed line between
V2 and V4 in [1]. This is within the dead zone range as
defined above and the motor will be off. Now if the reference
voltage is raised so that VPin 3 is less than V4, comparator B
will turn−on [3] enabling Q Drive, causing Drive Output A
to sink and B to source motor current [8]. The actuator will
move in Direction B until VPin 3 becomes greater than V1.
Comparator B will turn−off, activating the brake enable [4]
and Q Brake [6] causing Drive Output A to go high and B to
go into a high impedance state. The inertia of the mechanical
system will drive the motor as a generator creating a positive
voltage on Pin 10 with respect to Pin 14. The servo system
can be stopped quickly, so as not to over−shoot through the
dead zone range, by braking. This is accomplished by
shorting the motor/generator terminals together. Brake
current will flow into the diode at Drive Output B, through
the internal VCC rail, and out the emitter of the sourcing
transistor at Drive Output A. The end of the solid line and
beginning of the dashed for VPin 3 [1] indicates the possible
resting position of the actuator after braking.
Gearbox and Linkage
VCC
Motor
VCC
Non−
Inverting
Input
Input
Filter
9
8 20 k Error Amp
Inverting
Input
Output
7 20 k
6
+
20 k
35
mA
0.3 mA
B
Error Amp 3
3.0 k
Output Filter/
Feedback
3.0 k
A
Input
35
mA
VCC
+
Reference
Input 1 100 k 20 k
100 k
2
Reference
Input Filter
Window
Detector
11
Overvoltage
Monitor
18 V
Ref.
Drive Brake Logic
Q Drive
Q Brake
RQ
Direction
Latch
Q Brake
SQ
Q Drive
Brake Enable
4, 5,12,13
GND
QR
Over−
Current
Latch
QS
5.5
mA 50 k
7.5 V
Ref.
Overcurrent 16
Delay CDLY
Drive
Output B
10
Drive
Output A
14
+
Power
H−Switch
+
15 Overcurrent
ROC Reference
Overcurrent
Monitor
Figure 17. Representative Block Diagram and Typical Servo Application
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