MC3479PG ON Semiconductor, MC3479PG Datasheet - Page 7

• Manufacturer Part Number: MC3479PG
• Description: IC DRIVER STEPPER MOTOR 16DIP
• Manufacturer: ON Semiconductor
• Type: Stepper Motor Controllerr

Specifications of MC3479PG

• Applications: Stepper Motor Driver, 2 Phase
• Number Of Outputs: 1
• Current - Output: 350mA
• Voltage - Supply: 7.2 V ~ 16.5 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Through Hole
• Package / Case: 16-DIP (0.300", 7.62mm)
• Product: Stepper Motor Controllers / Drivers
• Supply Current: 75 mA
• Mounting Style: Through Hole
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Load: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: MC3479PGOS

determined by:
< 5.0 mA, the internal logic is set to the Phase A condition, and
the four driver outputs are put into a high impedance state.
The Phase A output (Pin 11) goes active (low), and input
signals at the controls are ignored during this time. Upon
re−establishing I
will be in the Phase A position (L1 = L3 = V
= V
controls.
powerup reset while supply voltages are settling. A CMOS
logic gate (powered by V
shown in Figure 12.
dissipation in the IC and in the motor may be lowered by
reducing I
Setting I
not reset the internal logic as described above. See Figure 13
for a suggested circuit.
The value of R
b) When this pin is opened (raised to V
The Set function (opening this pin) can be used as a
c) Whenever the motor is not being stepped, power
OLD
). The circuit will then respond to the inputs at the
BS
BS
to 75 mA will reduce the motor current, but will
CW/CCW
Bias/Set
, so as to reduce the output (motor) current.
Phase A
Output
Phase A
Output
BS
Clk
B
L1
L2
L3
L4
L1
L2
L3
L4
L1
L2
L3
L4
, the driver outputs become active, and
R
(between this pin and ground) is then
B
Phase A
+
M
A
A
V
) can be used to control this pin as
M
* 0.7 V
I
B
B
B
BS
C
C
C
(b) Half Step Mode
(c) Half Step Mode
(a) Full Step Mode
M
) such that I
D
D
D
OHD
Figure 7. Output Sequence
A
E
E
, L2 = L4
http://onsemi.com
BS
B
F
F
CW/CCW
F/HS
MC3479
is
C
G
G
7
F/HS
OIC
Power Dissipation
the junction temperature (T
power dissipated can be expressed as:
where
The power supply current (I
After the power dissipation is calculated, the junction
temperature can be calculated using:
T
where R
(52°C/W for the DIP, 72°C/W for the FN Package);
T
B
H
H
A
J
The power dissipated by the MC3479 must be such that
P = (V
= (P  R
= Ambient Temperature.
= High Impedance
= Logic 0"
= Logic 1", OIC = Logic 0"
A
A
A
M
qJA
= High Impedance
= Logic 0"
= Don′t Care
 I
qJA
D
B
B
= Junction−to−ambient thermal resistance
M
) + T
) + (2  I
V
I
I
V
V
C
C
C
M
OD
M
OHD
OLD
A
= Supply current other than I
= Supply voltage;
= Output current to each motor coil;
B
D
D
= Driver output low voltage.
= Driver output high voltage;
OD
J
) does not exceed 150°C. The
M
) [(V
) is obtained from Figure 8.
M
CW/CCW
F/HS
OIC
− V
OHD
= Logic 0"
= Logic 1"
= Logic 1"
) + V
OD
OLD
;
]