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MC33039 View Datasheet(PDF) - Motorola => Freescale

Part NameDescriptionManufacturer
MC33039 CLOSED LOOP BRUSHLESS MOTOR ADAPTER Motorola
Motorola => Freescale Motorola
MC33039 Datasheet PDF : 8 Pages
1 2 3 4 5 6 7 8
MC33039
Figure 1. Typical Three Phase, Six Step Motor Application
Rotor Electrical Position (Degrees)
0
60 120 180 240 300 360
480
600 720
φA
60° Sensor
Electrical
Phasing
φB
Input
φC
φA
120° Sensor
Electrical
Phasing
φB
Input
φC
φA Output
Latch ISetI Input
RT/CT
fout Output
Vth 0.67 VCC
Vout (AVG)
Constant Motor Speed
Increasing Motor
Speed
OPERATING DESCRIPTION
The MC33039 provides an economical method of
implementing closed–loop speed control of brushless DC
motors by eliminating the need for a magnetic or optical
tachometer. Shown in the timing diagram of Figure 1, the
three inputs (Pins 1, 2, 3) monitor the brushless motor rotor
position sensors. Each sensor signal transition is digitally
detected, ORied at the Latch iSeti Input, and causes CT to
discharge. A corresponding output pulse is generated at fout
(Pin 5) of a defined amplitude, and programmable width
determined by the values selected for RT and CT (Pin 6). The
average voltage of the output pulse train increases with
motor speed. When fed through a low pass filter or integrator,
a DC voltage proportional to speed is generated. Figure 2
shows the proper connections for a typical closed loop
application using the MC33035 brushless motor controller.
Constant speed operation down to 100 RPM is possible with
economical three phase four pole motors.
The φA inverter output (Pin 4) is used in systems where the
controller and motor sensor phasing conventions are not
compatible. A method of converting from either convention to
the other is shown in Figure 3. For a more detailed
explanation of this subject, refer to the text above Figure 39
on the MC33035 data sheet.
The output pulse amplitude VOH is constant with
temperature and controlled by the supply voltage on VCC
(Pin 8). Operation down to 5.5 V is guaranteed over
temperature. For systems without a regulated power supply,
an internal 8.25 V shunt regulator is provided.
MOTOROLA ANALOG IC DEVICE DATA
3
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