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NCV33035DWR2

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30
MC33035, NCV33035
http://onsemi.com
19
Figure 37. Three Phase, Six Step, Full Wave Commutation Waveforms
Rotor Electrical Position (Degrees)
100
000001
011111110
100
000001011111110
720660600540
480420360300240180120600
S
A
S
B
S
C
Code
S
C
S
B
Code
S
A
Sensor Inputs
60°/120
°
Select Pin
Open
Sensor Inputs
60°/120
°
Select Pin
Grounded
A
B
B
B
Q
2
+ Q
6
C
B
Q
2
+ Q
4
Q
3
+ Q
4
Q
3
+ Q
5
Q
1
+ Q
5
Q
1
+ Q
6
Bottom Drive
Outputs
Q
2
+ Q
6
Q
2
+ Q
4
Q
3
+ Q
4
Q
3
+ Q
5
Motor Drive
Current
B
Fwd/Rev = 1
C
−
O
+
−
O
+
Conducting
Power Switch
Transistors
Q
1
+ Q
5
Top Drive
Outputs
Q
1
+ Q
6
A
B
T
A
T
C
T
−
O
+
100 110 001011 001011110100010 010 101101
Reduced Speed ( ≈ 50% PWM)Full Speed (No PWM)
MC33035, NCV33035
http://onsemi.com
20
Figure 38 shows a three phase, three step, half wave motor
controller. This configuration is ideally suited for
automotive and other low voltage applications since there is
only one power switch voltage drop in series with a given
stator winding. Current flow is unidirectional or half wave
because only one end of each winding is switched.
Continuous braking with the typical half wave arrangement
presents a motor overheating problem since stator current is
limited only by the winding resistance. This is due to the lack
of upper power switch transistors, as in the full wave circuit,
used to disconnect the windings from the supply voltage
V
M
. A unique solution is to provide braking until the motor
stops and then turn off the bottom drives. This can be
accomplished by using the Fault
Output in conjunction with
the Output Enable as an over current timer. Components
R
DLY
and C
DLY
are selected to give the motor sufficient time
to stop before latching the Output Enable and the top drive
AND gates low. When enabling the motor, the brake switch
is closed and the PNP transistor (along with resistors R
1
and
R
DLY
) are used to reset the latch by discharging C
DLY
. The
stator flyback voltage is clamped by a single zener and three
diodes.
Figure 38. Three Phase, Three Step, Half Wave Motor Controller
Motor
9
24
20
Q
S
C
T
R
R
T
Oscillator
Gnd
I
Limit
Error Amp
PWM
Thermal
Shutdown
Reference
Regulator
Lockout
Undervoltage
V
M
4
2
1
21
16
10
11
13
8
12
3
17
22
7
6
5
Fwd/Rev
Q
R
S
19
Faster
60°/120°
SS
V
M
Speed
Set
Rotor
Position
Decoder
18
Brake
15
14
23
C
DLY
R
DLY
R
2
R
1
25 μA
N
N
MC33035, NCV33035
http://onsemi.com
21
Three Phase Closed Loop Controller
The MC33035, by itself, is only capable of open loop
motor speed control. For closed loop motor speed control,
the MC33035 requires an input voltage proportional to the
motor speed. Traditionally, this has been accomplished by
means of a tachometer to generate the motor speed feedback
voltage. Figure 39 shows an application whereby an
MC33039, powered from the 6.25 V reference (Pin 8) of the
MC33035, is used to generate the required feedback voltage
without the need of a costly tachometer. The same Hall
sensor signals used by the MC33035 for rotor position
decoding are utilized by the MC33039. Every positive or
negative going transition of the Hall sensor signals on any
of the sensor lines causes the MC33039 to produce an output
pulse of defined amplitude and time duration, as determined
by the external resistor R
1
and capacitor C
1
. The output train
of pulses at Pin 5 of the MC33039 are integrated by the error
amplifier of the MC33035 configured as an integrator to
produce a DC voltage level which is proportional to the
motor speed. This speed proportional voltage establishes the
PWM reference level at Pin 13 of the MC33035 motor
controller and closes the feedback loop. The MC33035
outputs drive a TMOS power MOSFET 3−phase bridge.
High currents can be expected during conditions of start−up,
breaking, and change of direction of the motor.
The system shown in Figure 39 is designed for a motor
having 120/240 degrees Hall sensor electrical phasing. The
system can easily be modified to accommodate 60/300
degree Hall sensor electrical phasing by removing the
jumper (J
2
) at Pin 22 of the MC33035.
Figure 39. Closed Loop Brushless DC Motor Control
Using The MC33035 and MC33039
Motor
TP
2
0.05/1.0 W
0.1
33
TP
1
1.0 k
V
M
(18 to 30 V)
1000
0.1
1.1 k
Close Loop
0.1
1.0 M
0.01
Speed
Faster
4.7 k
F/R
Brake
1.0 k
470
470
470
1N5819
1.1 k 1.1 k
1.0 k
1
2
3
4
8
7
6
5
1
2
3
4
9
5
6
7
8
10
24
23
22
21
20
19
18
17
16
15
MC33035
MC33039
1.0 M
R
1
750 pF
C
1
10 k
S
S
J
2
100 k
100
11
12
14
13
5.1 k
Enable
J
1
330
47 μF
1N5355B
18 V
2.2 k
0.1
1N4148
Latch On
Fault
Fault
Reset
N
N
2.2 k
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30

NCV33035DWR2

Mfr. #:
Buy NCV33035DWR2
Manufacturer:
ON Semiconductor
Description:
Motor / Motion / Ignition Controllers & Drivers DC Brushless Motor
Lifecycle:
New from this manufacturer.
Delivery:
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