MC3479P 查看數據表（PDF） - ON Semiconductor
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MC3479P Datasheet PDF : 12 Pages
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MC3479
+ 12 V
Bias/Set
Clk
OIC
F / HS
CW / CCW
0.1 µF
VM
16
L2
2
1.0 k
56 k
1.0 k
6
L1
3
1.0 k
MC3479P L4 1.0 k
7
14
1.0 k
8
L3
9
15
10
11
1.0 k
4 5 12 13
+ 12 V
4.0 k
Phase A
Bias/Set VM
Input
0
L1 - L4
Outputs
PWBS
VM - 1.0
VM - 1.0
tPBSD
(High Impedance)
tPBSD
Note: tr, tf (10% to 90%) for
input signals are p 25 ns.
Figure 2. AC Test Circuit
Figure 3. Bias/Set Timing (Refer to Figure 2)
Pin No.
20–Pin 16–Pin
20
16
4, 5, 6, 7,
14, 15, 16,
17
1
4, 5,
12, 13
1
2, 3,
18, 19
8
2, 3,
14, 15
6
9
7
11
9
12
10
10
8
13
11
PIN FUNCTION DESCRIPTION
Function
Power Supply
Ground
Clamp Diode
Voltage
Driver Outputs
Bias/Set
Symbol
VM
Gnd
VD
L1, L2
L3, L4
B/S
Clock
Full/Half Step
Clk
F/HS
Clockwise/
Counterclockwise
Output Impedance
Control
CW/CCW
OIC
Phase A
Ph A
Description
Power supply pin for both the logic circuit and the motor coil current.
Voltage range is + 7.2 to + 16.5 volts.
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.
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.
High current outputs for the motor coils. L1 and L2 are connected to one
coil, and L3 and L4 to the other coil.
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 µA) 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.
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.
This input allows reversing the rotation of the motor. See Figure 7 for
sequence.
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).
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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