MC33033 Motorola, MC33033 Datasheet - Page 17

• Manufacturer Part Number: MC33033
• Description: BRUSHLESS DC MOTOR CONTROLLER
• Manufacturer: Motorola

controller. This configuration is ideally suited for automobile
and other low voltage applications since there is only one
power switch voltage drop in series with a given stator
MOTOROLA ANALOG IC DEVICE DATA
Figure 36 shows a three phase, three step, half wave motor
R T
C T
FWR/REV
60 /120
Enable
V M
Speed
Set
Faster
10
11
18
19
14
6
3
7
9
8
4
5
Error Amp
Figure 36. Three Phase, Three Step, Half Wave Motor Controller
Reference
Regulator
Oscillator
PWM
Undervoltage
Shutdown
Thermal
R
S
S
R
13
Decoder
Position
Rotor
Lockout
Q
Q
Gnd
MC33033
winding. Current flow is unidirectional or half wave because
only one end of each winding is switched. The stator flyback
voltage is clamped by a single zener and three diodes.
I Limit
20
1
2
17
16
15
12
V M
S
Motor
N
N
S
17