MC33033_07 ONSEMI [ON Semiconductor], MC33033_07 Datasheet - Page 18

• Manufacturer Part Number: MC33033_07
• Description: Brushless DC Motor Controller
• Manufacturer: ONSEMI [ON Semiconductor]

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
Figure 37 shows a three phase, three step, half wave motor
R
C
T
FWR/REV
T
60°/120°
Enable
Speed
Set
V
M
Faster
10
11
18
19
14
4
5
6
3
7
9
8
Figure 37. Three Phase, Three Step, Half Wave Motor Controller
Error Amp
Reference
Regulator
Oscillator
PWM
Undervoltage
Shutdown
Thermal
MC33033, NCV33033
13
Decoder
R
S
S
R
Position
http://onsemi.com
Rotor
Lockout
Q
Q
Gnd
18
stator 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
2
1
17
16
15
12
V
M
S
Motor
N
N
S