MC33033DWR2G ON Semiconductor, MC33033DWR2G Datasheet - Page 20

• Manufacturer Part Number: MC33033DWR2G
• Description: IC CTRLR MOTOR DC BRSHLSS 20SOIC
• Manufacturer: ON Semiconductor
• Type: Brushless DC Motor Controllerr

Specifications of MC33033DWR2G

• Applications: DC Motor Controller, Brushless (BLDC), 3 Phase
• Number Of Outputs: 1
• Current - Output: 100mA
• Voltage - Load: 5.9 V ~ 6.5 V
• Voltage - Supply: 10 V ~ 30 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 20-SOIC (7.5mm Width)
• Operating Supply Voltage: 10 V to 30 V
• Supply Current: 22 mA
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: MC33033DWR2GOS; MC33033DWR2GOS; MC33033DWR2GOSTR

Sensor Phasing Comparison
phasing of the sensor signals in three phase motors. With six
step drive, an input signal change must occur every 60
electrical degrees, however, the relative signal phasing is
dependent upon the mechanical sensor placement. A
comparison of the conventions in electrical degrees is shown
in Figure 39. From the sensor phasing table (Figure 40), note
that the order of input codes for 60° phasing is the reverse of
300°. This means the MC33033, when the 60°/120° select
(Pin 18) and the FWD/REV (Pin 3) both in the high state
(open), is configured to operate a 60° sensor phasing motor
in the forward direction. Under the same conditions a 300°
sensor phasing motor would operate equally well but in the
reverse direction. One would simply have to reverse the
FWD/REV switch (FWD/REV closed) in order to cause the
300° motor to also operate in the same direction. The same
difference exists between the 120° and 240° conventions.
S
1
1
1
0
0
0
There are four conventions used to establish the relative
A
120°
240°
300°
60°
60°
S
0
1
1
1
0
0
B
Figure 39. Sensor Phasing Comparison
S
S
S
S
S
S
S
S
S
S
S
S
S
0
0
1
1
1
0
Sensor Electrical Phasing (Degrees)
A
B
C
A
B
C
A
B
C
A
B
C
Figure 40. Sensor Phasing Table
C
0
S
1
1
1
0
0
0
60
A
Rotor Electrical Position (Degrees)
120
120°
S
0
0
1
1
1
0
B
180
S
1
0
0
0
1
1
C
240
S
300
1
1
1
0
0
0
A
360
240°
S
1
0
0
0
1
1
B
420
S
0
0
1
1
1
0
480
C
540
S
1
1
1
0
0
0
A
MC33033, NCV33033
600
300°
S
1
1
0
0
0
1
B
http://onsemi.com
660
S
1
0
0
0
1
1
720
C
20
in electrical degrees since the mechanical position is a
function of the number of rotating magnetic poles. The
relationship between the electrical and mechanical position
is:
electrical revolutions for a given mechanical revolution.
General purpose three phase motors typically contain a four
pole rotor which yields two electrical revolutions for one
mechanical.
Two and Four Phase Motor Commutation
of providing a four step output that can be used to drive two
or four phase motors. The truth table in Figure 41 shows that
by connecting sensor inputs S
to truncate the number of drive output states from six to four.
The output power switches are connected to B
C
control application. Power switch transistors Q
are Darlington type, each with an internal parasitic catch
diode. With four step drive, only two rotor position sensors
spaced at 90 electrical degrees are required. The
commutation waveforms are shown in Figure 43.
controller. It has the same features as the circuit in Figure 37,
except for the deletion of speed adjust.
Electrical Degrees + Mechanical Degrees #Rotor Poles
*With MC33033 sensor input S
Sensor Electrical
B
In this data sheet, the rotor position has always been given
An increase in the number of magnetic poles causes more
The MC33033 configured for 60° sensor inputs is capable
Figure 44 shows a four phase, four step, half wave motor
Spacing* = 90°
. Figure 42 shows a four phase, four step, full wave motor
S
1
1
0
0
1
1
0
0
A
Figure 41. Two and Four Phase, Four Step,
Inputs
MC33033 (60°/120° Select Pin Open)
S
0
1
1
0
0
1
1
0
B
Commutation Truth Table
F/R
1
1
1
1
0
0
0
0
B
connected to S
B
B
Top Drives
1
0
1
1
1
1
1
0
T
and S
C
C
1
1
0
1
0
1
1
1
C
together, it is possible
Outputs
T
Bottom Drives
B
T
0
0
0
1
0
1
0
0
, C
1
B
through Q
T
2
, B
C
B
1
0
0
0
0
0
1
0
, and
B
8