MC33033DWR2(2007) View Datasheet(PDF) - ON Semiconductor
Part Name
Description
Manufacturer
MC33033DWR2 Datasheet PDF : 27 Pages
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MC33033, NCV33033
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
Bottom Drive Outputs are held in a low state. Each of the
comparators contain hysteresis to prevent oscillations when
crossing their respective thresholds.
Capacitor CT
Error Amp Out/
PWM Input
Current Sense
Input
Latch Set"
Inputs
Top Drive
Outputs
Bottom Drive
Outputs
Figure 21. PWM Timing Diagram
14
Vin
UVLO
REF
MPS
7
U01A
Sensor
Power
≈5.6 V
To
Control
Circuitry
6.25 V
Vin
36
MPS
U51A
14
REF
7
UVLO
0.1
To Control Circuitry
and Sensor Power
6.25 V
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.
Figure 22. Reference Output Buffers
Rotor
Position
Decoder
VM
2
VCC
Q2
AT
1
Q1
Q3
BT
20
CT
Load
17
16
Q4
15
Transistor Q1 is a common base stage used to level shift from VCC to the high
motor voltage, VM. The collector diode is required if VCC is present while VM
is low.
Figure 23. High Voltage Interface with
NPN Power Transistors
Rotor
Position
Decoder
VCC = 12 V VBoost VM = 170 V
2
1.0 k
AT
1
65
1
BT
2 1.0 M 4
20
4.7 k
CT
1N4744
MOC8204
Optocoupler
Load
17
16
15
Figure 24. High Voltage Interface with
N−Channel Power MOSFETs
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