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MC33030DWR2G Datasheet(PDF) 10 Page - ON Semiconductor

Part # MC33030DWR2G
Description  DC Servo Motor Controller/Driver
Download  17 Pages
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

MC33030DWR2G Datasheet(HTML) 10 Page - ON Semiconductor

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10
If VPin 3 should continue to rise and become greater than
V2, the actuator will have over shot the dead zone range and
cause the motor to run in Direction A until VPin 3 is equal to
V3. The Drive/Brake behavior for Direction A is identical to
that of B. Overshooting the dead zone range in both
directions can cause the servo system to continuously hunt
or oscillate. Notice that the last motor run−direction is stored
in the direction latch. This information is needed to
determine whether Q or Q Brake is to be enabled when
VPin 3 enters the dead zone range. The dashed lines in [8,9]
indicate the resulting waveforms of an overcurrent
condition that has exceeded the programmed time delay.
Notice that both Drive Outputs go into a high impedance
state until VPin 2 is readjusted so that VPin 3 enters or crosses
through the dead zone [7, 4].
The inputs of the Error Amp and Window Detector can be
susceptible to the noise created by the brushes of the DC
motor and cause the servo to hunt. Therefore, each of these
inputs are provided with an internal series resistor and are
pinned out for an external bypass capacitor. It has been
found that placing a capacitor with short leads directly
across the brushes will significantly reduce noise problems.
Good quality RF bypass capacitors in the range of 0.001 to
0.1
mF may be required. Many of the more economical
motors will generate significant levels of RF energy over a
spectrum that extends from DC to beyond 200 MHz. The
capacitance value and method of noise filtering must be
determined on a system by system basis.
Thus far, the operating description has been limited to
servo systems in which the motor mechanically drives a
potentiometer for position sensing. Figures 19, 20, 27, and
31 show examples that use light, magnetic flux, temperature,
and pressure as a means to drive the feedback element.
Figures 21, 22 and 23 are examples of two position, open
loop servo systems. In these systems, the motor runs the
actuator to each end of its travel limit where the Overcurrent
Monitor detects a locked rotor condition and shuts down the
drive. Figures 32 and 33 show two possible methods of using
the MC33030 as a switching motor controller. In each
example a fixed reference voltage is applied to Pin 2. This
causes Vpin 3 to be less than V4 and Drive Output A, Pin 14,
to be in a low state saturating the TIP42 transistor. In
Figure 32, the motor drives a tachometer that generates an
ac voltage proportional to RPM. This voltage is rectified,
filtered, divided down by the speed set potentiometer, and
applied to Pin 8. The motor will accelerate until VPin 3 is
equal to V1 at which time Pin 14 will go to a high state and
terminate the motor drive. The motor will now coast until
VPin 3 is less than V4 where upon drive is then reapplied. The
system operation of Figure 31 is identical to that of
Figure 32 except the signal at Pin 3 is an amplified average
of the motors drive and back EMF voltages. Both systems
exhibit excellent control of RPM with variations of VCC;
however,
Figure
32
has
somewhat
better
torque
characteristics at low RPM.


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