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參數(shù)資料
| 型號(hào)： | MC3479 |
| 廠商： | Motorola, Inc. |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | STEPPER MOTOR DRIVER |
| 中文描述： | 步進(jìn)電機(jī)驅(qū)動(dòng)器 |
| 文件頁(yè)數(shù)： | 4/10頁(yè) |
| 文件大?。?/td> | 159K |
| 代理商： | MC3479 |
MC3479
4
MOTOROLA ANALOG IC DEVICE DATA
5
Phase A
+ 12 V
MC3479P
CW / CCW
F / HS
OIC
Clk
Bias/Set
56 k
6
7
8
9
10
4
12 13
15
14
3
2
16
VM
1.0 k
1.0 k
1.0 k
1.0 k
1.0 k
1.0 k
4.0 k
11
L3
L4
L1
L2
0.1
μ
F
+ 12 V
Figure 2. AC Test Circuit
Note: tr, tf (10% to 90%) for
input signals are
25 ns.
Figure 3. Bias/Set Timing
(Refer to Figure 2)
Bias/Set
Input
VM
PWBS
VM – 1.0
VM – 1.0
tPBSD
tPBSD
(High Impedance)
0
L1 – L4
Outputs
PIN FUNCTION DESCRIPTION
Pin No.
20–Pin
16–Pin
Function
Symbol
Description
20
16
Power Supply
VM
Power supply pin for both the logic circuit and the motor coil current.
Voltage range is + 7.2 to + 16.5 volts.
4, 5, 6, 7,
14, 15, 16, 17
4, 5,
12, 13
Ground
Gnd
Ground pins for the logic circuit and the motor coil current. The
physical configuration of the pins aids in dissipating heat from within
the IC package.
1
1
Clamp Diode
Voltage
VD
This pin is used to protect the outputs where large voltage spikes may
occur as the motor coils are switched. Typically a diode is connected
between this pin and Pin 16. See Figure 11.
2, 3,
18, 19
2, 3,
14, 15
Driver Outputs
L1, L2
L3, L4
High current outputs for the motor coils. L1 and L2 are connected to
one coil, and L3 and L4 to the other coil.
8
6
Bias/Set
B/S
This pin is typically 0.7 volts below VM. The current out of this pin
(through a resistor to ground) determines the maximum output sink
current. If the pin is opened (IBS < 5.0
μ
A) the outputs assume a high
impedance condition, while the internal logic presets to a Phase A
condition.
The positive edge of the clock input switches the outputs to the next
position. This input has no effect if Pin 6 is open.
9
7
Clock
Clk
11
9
Full/Half Step
F/HS
When low (Logic “0”), each clock input pulse will cause the motor to
rotate one full step. When high, each clock pulse will cause the motor
to rotate one–half step. See Figure 7 for sequence.
12
10
Clockwise/
Counterclockwise
CW/CCW
This input allows reversing the rotation of the motor. See Figure 7 for
sequence.
10
8
Output Impedance
Control
OIC
This input is relevant only in the half step mode (Pin 9 > 2.0 V). When
low (Logic “0”), the two driver outputs of the non–energized coil will be
in a high impedance condition. When high the same driver outputs will
be at a low impedance referenced to VM. See Figure 7.
This open–collector output indicates (when low) that the driver outputs
are in the Phase A condition (L1 = L3 = VOHD, L2 = L4 = VOLD).
13
11
Phase A
Ph A
APPLICATION INFORMATION
General
The MC3479 integrated circuit is designed to drive a
stepper positioning motor in applications such as disk drives
and robotics. The outputs can provide up to 350 mA to each
of two coils of a two–phase motor. The outputs change state
with each low–to–high transition of the clock input, with the
new output state depending on the previous state, as well as
the input conditions at the logic controls.
Outputs
The outputs (L1–L4) are high current outputs (see
Figure 5), which when connected to a two–phase motor,
provide two full–bridge configurations (L3 and L4 are not
shown in Figure 5). The polarities applied to the motor coils
depend on which transistor (QH or QL) of each output is on,
which in turn depends on the inputs and the decoding
circuitry.
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