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MC33030PG Folha de dados(PDF) 9 Page - ON Semiconductor

Nome de Peças MC33030PG
Descrição Electrónicos  DC Servo Motor Controller/Driver
Download  17 Pages
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Fabricante Electrônico  ONSEMI [ON Semiconductor]
Página de início  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

MC33030PG Folha de dados(HTML) 9 Page - ON Semiconductor

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MC33030
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9
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.
Inverting
Input
Overvoltage
Monitor
Drive Brake Logic
+
Drive
Output A
Drive
Output B
VCC
Motor
10
11
Power
H−Switch
Q Brake
Q Brake
Overcurrent
Monitor
Overcurrent
Reference
ROC
15
+
16
CDLY
Overcurrent
Delay
5.5
mA
7.5 V
Ref.
50 k
R
S
Over−
Current
Latch
Q Drive
S
Q Drive
R
Brake Enable
Direction
Latch
18 V
Ref.
Gearbox and Linkage
GND
4, 5,12,13
+
Window
Detector
VCC
Reference
Input Filter
20 k
35
mA
A
B
3.0 k
3.0 k
35
mA
20 k
Non−
Inverting
Input
9
Input
Filter
+
VCC
Output
20 k
0.3 mA
8 20 k Error Amp
Error Amp
Output Filter/
Feedback
Input
Figure 17. Representative Block Diagram and Typical Servo Application
14
Q
Q
Q
100 k
2
1
Q
3
6
Reference
Input
7
100 k


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