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PDF MC33033 Data sheet ( Hoja de datos )
| Número de pieza | MC33033 | |
| Descripción | BRUSHLESS DC MOTOR CONTROLLER | |
| Fabricantes | Motorola Semiconductors | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MC33033 (archivo pdf) en la parte inferior de esta página. Total 24 Páginas | ||
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Order this document by MC33033/D
Brushless DC
Motor Controller
The MC33033 is a high performance second generation, limited feature,
monolithic brushless dc motor controller which has evolved from Motorola′s
full featured MC33034 and MC33035 controllers. It contains all of the active
functions required for the implementation of open loop, three or four phase
motor control. The device consists of a rotor position decoder for proper
commutation sequencing, temperature compensated reference capable of
supplying sensor power, frequency programmable sawtooth oscillator, fully
accessible error amplifier, pulse width modulator comparator, three open
collector top drivers, and three high current totem pole bottom drivers ideally
suited for driving power MOSFETs. Unlike its predessors, it does not feature
separate drive circuit supply and ground pins, brake input, or fault output
signal.
Included in the MC33033 are protective features consisting of
undervoltage lockout, cycle–by–cycle current limiting with a selectable time
delayed latched shutdown mode, and internal thermal shutdown.
Typical motor control functions include open loop speed, forward or
reverse direction, and run enable.The MC33033 is designed to operate
brushless motors with electrical sensor phasings of 60°/300° or 120°/240°,
and can also efficiently control brush dc motors.
• 10 to 30 V Operation
• Undervoltage Lockout
• 6.25 V Reference Capable of Supplying Sensor Power
• Fully Accessible Error Amplifier for Closed Loop Servo Applications
• High Current Drivers Can Control External 3–Phase MOSFET Bridge
• Cycle–By–Cycle Current Limiting
• Internal Thermal Shutdown
• Selectable 60°/300° or 120°/240° Sensor Phasings
• Also Efficiently Control Brush DC Motors with External MOSFET
H–Bridge
Device
MC33033DW
MC33033P
ORDERING INFORMATION
Operating
Temperature Range
TA = – 40° to + 85°C
Package
SO–20L
Plastic DIP
MC33033
BRUSHLESS DC
MOTOR CONTROLLER
SEMICONDUCTOR
TECHNICAL DATA
20
1
P SUFFIX
PLASTIC PACKAGE
CASE 738
20
1
DW SUFFIX
PLASTIC PACKAGE
CASE 751D
(SO–20L)
PIN CONNECTIONS
Top Drive
Output
BT 1
AT 2
Fwd/Rev 3
Sensor
Inputs
SA 4
SB 5
SC 6
Reference Output 7
Oscillator 8
Error Amp
Non Inverting Input
Error Amp
Inverting Input
9
10
20 CT
19 Output Enable
18 60°/120° Select
17 AB
16 BB
15 CB
Bottom
Drive
Outputs
14 VCC
13 Gnd
12
Current Sense
Non Inverting Input
11 Error Amp Out/
PWM Input
(Top View)
MOTOROLA ANALOG IC DEVICE DATA
© Motorola, Inc. 1996
Rev 3
1
1 page  
MC33033
Figure 1. Oscillator Frequency versus
Timing Resistor
100
VCC = 20 V
TA = 25°C
10
Figure 2. Oscillator Frequency Change
versus Temperature
4.0
VCC = 20 V
2.0 RT = 4.7 k
CT = 10 nF
0
CT = 100 nF
CT = 10 nF
CT = 1.0 nF
0
1.0 10 100
RT, TIMING RESISTOR (kΩ)
1000
– 2.0
– 4.0
– 55 – 25 0 25 50 75 100 125
TA, AMBIENT TEMPERATURE (°C)
Figure 3. Error Amp Open Loop Gain and
Phase versus Frequency
56 40
48 60
40 80
32 100
Phase
24 120
16
8.0
VCC = 20 V
VO = 3.0 V
0 RL = 15 k
– 8.0
CL = 100 pF
TA = 25°C
–16
– 24
1.0 k
10 k
Gain
100 k
1.0 M
140
160
180
200
220
240
10M
f, FREQUENCY (Hz)
Figure 4. Error Amp Output Saturation
Voltage versus Load Current
0
Vref
– 0.8 Source Saturation
(Load to Ground)
VCC = 20 V
TA = 25°C
–1.6
1.6
0.8
Gnd
Sink Saturation
(Load to Vref)
0
0 1.0 2.0 3.0 4.0 5.0
IO, OUTPUT LOAD CURRENT (mA)
Figure 5. Error Amp Small–Signal
Transient Response
AV = +1.0
3.05
No Load
TA = 25°C
3.0
2.95
1.0 µs/DIV
Figure 6. Error Amp Large–Signal
Transient Response
AV = +1.0
4.5
No Load
TA = 25°C
3.0
1.5
5.0 µs/DIV
MOTOROLA ANALOG IC DEVICE DATA
5
5 Page 
MC33033
Figure 19. Three Phase, Six Step Commutation Truth Table (Note 1)
Inputs (Note 2)
Outputs (Note 3)
Sensor Electrical Phasing (Note 4)
Top Drives
Bottom Drives
60° 120°
Current
SA SB SC SA SB SC F/R Enable Sense AT BT CT AB BB CB
100100
1
1
0 011001
110110
1
1
0 101001
111010
1
1
0 101100
011011
1
1
0 110100
001001
1
1
0 110010
000101
1
1
0 011010
100100
0
1
0 110100
110110
0
1
0 110010
111010
0
1
0 011010
011011
0
1
0 011001
001001
0
1
0 101001
000101
0
1
0 101100
101111
X
X
X 111000
010000
X
X
X 111000
VVVVVV
X
0
X 111000
VVVVVV
X
1
1 111000
(Note 5)
F/R = 1
(Note 5)
F/R = 0
(Note 6)
(Note 7)
(Note 8)
NOTES: 1. V = Any one of six valid sensor or drive combinations.
X = Don’t care.
2. The digital inputs (Pins 3, 4, 5, 6, 18, 19) are all TTL compatible. The current sense input (Pin 12) has a 100 mV threshold with respect to Pin 13. A
logic 0 for this input is defined as < 85 mV, and a logic 1 is > 115 mV.
3. The top drive outputs are open collector design and active in the low (0) state.
4. With 60°/120° (Pin 18) in the high (1) state, configuration is for 60° sensor electrical phasing inputs. With Pin 18 in the low (0) state, configuration is
for 120° sensor electrical phasing inputs.
5. Valid 60° or 120° sensor combinations for corresponding valid top and bottom drive outputs.
6. Invalid sensor inputs; All top and bottom drives are off.
7. Valid sensor inputs with enable = 0; All top and bottom drives are off.
8. Valid sensor inputs with enable and current sense = 1; All top and bottom drives are off.
oscillator ramp–up period. The stator current is converted to
a voltage by inserting a ground–referenced sense resistor RS
(Figure 34) in series with the three bottom switch transistors
(Q4, Q5, Q6). The voltage developed across the sense
resistor is monitored by the current sense input (Pin 12), and
compared to the internal 100 mV reference. If the current
sense threshold is exceeded, the comparator resets the
lower latch and terminates output switch conduction. The
value for the sense resistor is:
+RS
0.1
Istator(max)
The dual–latch PWM configuration ensures that only one
single output conduction pulse occurs during any given
oscillator cycle, whether terminated by the output of the Error
Amplifier or the current limit comparator.
Reference
The on–chip 6.25 V regulator (Pin 7) provides charging
current for the oscillator timing capacitor, a reference for the
Error Amplifier, and can supply 20 mA of current suitable for
directly powering sensors in low voltage applications. In
higher voltage applications it may become necessary to
transfer the power dissipated by the regulator off the IC. This
is easily accomplished with the addition of an external pass
transistor as shown in Figure 21. A 6.25 V reference level
was chosen to allow implementation of the simpler NPN
circuit, where Vref – VBE exceeds the minimum voltage
required by Hall Effect sensors over temperature. With
proper transistor selection, and adequate heatsinking, up to
one amp of load current can be obtained.
Undervoltage Lockout
A dual Undervoltage Lockout has been incorporated to
prevent damage to the IC and the external power switch
transistors. Under low power supply conditions, it guarantees
that the IC and sensors are fully functional, and that there is
sufficient Bottom Drive Output voltage. The positive power
supply to the IC (VCC) is monitored to a threshold of 8.9 V.
This level ensures sufficient gate drive necessary to attain
low RDS(on) when interfacing with standard power MOSFET
devices. When directly powering the Hall sensors from the
reference, improper sensor 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.
MOTOROLA ANALOG IC DEVICE DATA
11
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet MC33033.PDF ] | |
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