5804
BiMOS II UNIPOLAR
STEPPER-MOTOR TRANSLATOR/DRIVER
OUTPUT
B
1
2
3
4
LOGIC
GROUND
OUTPUT
5
6
7
8
12
11
10
9
GROUND
STEP INPUT
HALF-STEP
ONE-PHASE
V
DD
OE
16
15
14
13
SUPPLY
OUTPUT
ENABLE
DIRECTION
GROUND
K
BD
OUTPUT
D
GROUND
Combining low-power CMOS logic with high-current and high-voltage
bipolar outputs, the UCN5804B and UCN5804LB BiMOS II translator/
drivers provide complete control and drive for a four-phase unipolar stepper-
motor with continuous output current ratings to 1.25 A per phase (1.5 A
startup) and 35 V.
The CMOS logic section provides the sequencing logic, DIRECTION
and OUTPUT ENABLE control, and a power-on reset function. Three
stepper-motor drive formats, wave-drive (one-phase), two-phase, and half-
step are externally selectable. The inputs are compatible with standard
CMOS, PMOS, and NMOS circuits. TTL or LSTTL may require the use of
appropriate pull-up resistors to ensure a proper input-logic high.
The wave-drive format consists of energizing one motor phase at a time
in an A-B-C-D (or D-C-B-A) sequence. This excitation mode consumes the
least power and assures positional accuracy regardless of any winding
inbalance in the motor. Two-phase drive energizes two adjacent phases in
each detent position (AB-BC-CD-DA). This sequence mode offers an
improved torque-speed product, greater detent torque, and is less susceptible
to motor resonance. Half-step excitation alternates between the one-phase
and two-phase modes (A-AB-B-BC-C-CD-D-DA), providing an eight-step
sequence.
The bipolar outputs are capable of sinking up to 1.5 A and withstanding
50 V in the off state (sustaining voltages up to 35 V). Ground-clamp and
flyback diodes provide protection against inductive transients. Thermal
protection circuitry disables the outputs when the chip temperature is exces-
sive.
Both devices are rated for operation over the temperature range of -20擄C
to +85擄C. The UCN5804B is supplied in a 16-pin dual in-line plastic batwing
package with a copper lead frame and heat-sinkable tabs for improved power
dissipation capabilities; the UCN5804LB is supplied in a 16-lead plastic
SOIC batwing package with a copper lead frame and heat-sinkable tabs.
Data Sheet
26184.12C*
C
K
AC
OUTPUT
A
Dwg. W-194
Note that the UCN5804B (dual in-line package)
and UCN5804LB (small outline IC package) are
electrically identical and share a common
terminal number assignment.
ABSOLUTE MAXIMUM RATINGS
Output Voltage, V
CE
...............................
50 V
Output Sustaining Voltage,
V
CE (sus)
............................................
35 V
Output Sink Current, I
OUT
....................
1.5 A
Logic Supply Voltage, V
DD
....................
7.0 V
Input Voltage, V
IN
..................................
7.0 V
Package Power Dissipation,
P
D
.........................................
See Graph
Operating Temperature Range,
T
A
..................................
-20
擄
C to +85
擄
C
Storage Temperature Range,
T
S
................................
-55
擄
C to +150
擄
C
FEATURES
I
I
I
I
I
I
I
1.5 A Maximum Output Current
35 V Output Sustaining Voltage
Wave-Drive, Two-Phase, and Half-Step Drive Formats
Internal Clamp Diodes
Output Enable and Direction Control
Power-On Reset
Internal Thermal Shutdown Circuitry
Always order by complete part number, e.g.,
UCN5804B
.
ALLEGRO
1
2
3
4
5
6
7
8
