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MC33039DR2G Arkusz danych(PDF) 3 Page - ON Semiconductor

Numer części MC33039DR2G
Szczegółowy opis  Closed Loop Brushless Motor Adapter
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Producent  ONSEMI [ON Semiconductor]
Strona internetowa  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

MC33039DR2G Arkusz danych(HTML) 3 Page - ON Semiconductor

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MC33039, NCV33039
http://onsemi.com
3
Figure 1. Typical Three Phase, Six Step Motor Application
fout Output
Latch
ISetI Input
φA Output
φC
120
° Sensor
Electrical
Phasing
Input
φB
RT/CT
φC
60
° Sensor
Electrical
Phasing
Input
φB
φA
φA
Vout (AVG)
Constant Motor Speed
Increasing Motor
Speed
Vth ≈ 0.67 VCC
240
60
120
300
720
600
0
Rotor Electrical Position (Degrees)
180
360
480
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, OR
ied 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.


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