MC33033_07 ONSEMI [ON Semiconductor], MC33033_07 Datasheet - Page 13
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MC33033_07
Manufacturer Part Number
MC33033_07
Description
Brushless DC Motor Controller
Manufacturer
ONSEMI [ON Semiconductor]
Datasheet
1.MC33033_07.pdf
(27 pages)
operation can result if the reference output voltage should
fall below 4.5 V. If one or both of the comparators detects an
undervoltage condition, the top drives are turned off and the
Capacitor C
Error Amp Out/
PWM Input
Current Sense
Input
Latch Set"
Inputs
Top Drive
Outputs
Bottom Drive
Outputs
Transistor Q
motor voltage, V
is low.
Decoder
Position
Rotor
Figure 23. High Voltage Interface with
T
1
is a common base stage used to level shift from V
Figure 21. PWM Timing Diagram
M
. The collector diode is required if V
NPN Power Transistors
15
2
1
20
17
16
C
A
B
T
T
T
V
CC
CC
is present while V
Q
1
Q
CC
MC33033, NCV33033
2
to the high
Q
Q
http://onsemi.com
Load
3
4
V
M
M
13
Bottom Drive Outputs are held in a low state. Each of the
comparators contain hysteresis to prevent oscillations when
crossing their respective thresholds.
Decoder
Position
The NPN circuit is recommended for powering Hall or opto sensors,
where the output voltage temperature coefficient is not critical. The PNP
circuit is slightly more complex, but also more accurate. Neither circuit
has current limiting.
Rotor
Figure 24. High Voltage Interface with
Figure 22. Reference Output Buffers
To Control Circuitry
and Sensor Power
V
V
U51A
N−Channel Power MOSFETs
U01A
MPS
MPS
in
in
Sensor
≈5.6 V
Power
6.25 V
36
0.1
Circuitry
Control
6.25 V
To
14
14
7
15
7
2
1
20
17
16
A
B
C
T
T
T
V
REF
REF
CC
4.7 k
= 12 V
1.0 k
1
2
Optocoupler
MOC8204
1.0 M
UVLO
UVLO
6
V
1N4744
Boost
5
4
V
M
Load
= 170 V