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PDF MC3479 Data sheet ( Hoja de datos )
| Número de pieza | MC3479 | |
| Descripción | Stepper Motor Driver | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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MC3479
Stepper Motor Driver
The MC3479 is designed to drive a two−phase stepper motor in the
bipolar mode. The circuit consists of four input sections, a logic
decoding/sequencing section, two driver−stages for the motor coils,
and an output to indicate the Phase A drive state.
Features
• Single Supply Operation: 7.2 to 16.5 V
• 350 mA/Coil Drive Capability
• Clamp Diodes Provided for Back−EMF Suppression
• Selectable CW/CCW and Full/Half Step Operation
• Selectable High/Low Output Impedance (Half Step Mode)
• TTL/CMOS Compatible Inputs
• Input Hysteresis: 400 mV Minimum
• Phase Logic Can Be Initialized to Phase A
• Phase A Output Drive State Indication (Open−Collector)
• Pb−Free Package is Available*
VM
Clk Clock
CW/CCW
CW/CCW
Full/Half
Step
OIC
F/H Step
OIC
Logic
Driver
Driver
L1
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L2
VD
L3
L4
Phase A
Bias/Set
GND
Figure 1. Representative Block Diagram
ORDERING INFORMATION
Device
Operating
Temperature Range
MC3479P
MC3479PG
TA = 0° to +70°C
Package
PDIP−16
PDIP−16
(Pb−Free)
Shipping
25 Units / Rail
*For additional information on our Pb−Free strategy and soldering details, please
download the ON Semiconductor Soldering and Mounting Techniques
Reference Manual, SOLDERRM/D.
© Semiconductor Components Industries, LLC, 2006
June, 2006 − Rev. 7
1
http://onsemi.com
PDIP−16
P SUFFIX
CASE 648C
MARKING DIAGRAM
16
MC3479P
AWLYYWWG
1
A = Assembly Location
WL = Wafer Lot
YY = Year
WW = Work Week
G = Pb−Free Package
PIN CONNECTIONS
VD
L2
L1
GND
Bias/Set
Clk
OIC
1
2
3
4
5
6
7
8
(Top View)
16 VM
15 L3
14 L4
13
GND
12
11 Phase A
10 CW/CCW
9 Full/Half
Step
INPUT TRUTH TABLE
Input Low Input High
CW/CCW
CW CCW
Full/Half Step
Full Step
Half Step
OIC Hi Z Low Z
Clk Positive Edge Triggered
Publication Order Number:
MC3479/D
1 page  
MC3479
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.
3.0 V
Clk
0
PWCLKH
1.5 V
tPCD
PWCLKL
L1 − L4
Outputs
F/HS,
CW/CCW
Inputs 0
3.0 V
Phase A
Output
6.0 V
tsu th
1.5 V
tPHLA
tPLHA
1.5 V
Figure 4. Clock Timing (Refer to Figure 2)
Note: tr, tf (10% to 90%) for
input signals are p 10 ns.
B/S
RB IBS
VM VD
I′BS
Current
Drivers
and
Logic
To L3, L4
Transistors
QH
Motor Coil
L1
QL
L2
Parasitic
Diodes
Logic Decoding
Circuit
CW / CCW
F/HS
Inputs
Figure 5. Output Stages
OIC
Clk
QH
QL
The maximum sink current available at the outputs is a
function of the resistor connected between Pin 6 and ground
(see section on Bias/Set operation). Whenever the outputs
are to be in a high impedance state, both transistors (QH and
QL of Figure 5) of each output are off.
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| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet MC3479.PDF ] | |
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