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

°C

to +85

°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.

FEATURES

I 1.5 A Maximum Output Current

I 35 V Output Sustaining Voltage

I Wave-Drive, Two-Phase, and Half-Step Drive Formats

I Internal Clamp Diodes

I Output Enable and Direction Control

I Power-On Reset

I Internal Thermal Shutdown Circuitry

BiMOS II UNIPOLAR

STEPPER-MOTOR TRANSLATOR/DRIVER

Always order by complete part number, e.g., UCN5804B .

Dwg. W-194

SUPPLY

DIRECTION

OUTPUT

ENABLE

GROUND

GROUND

GROUND

GROUND

STEP INPUT

HALF-STEP

ONE-PHASE

OUTPUT

OUTPUT

OUTPUT

BD

D

K

C

AC

A

K

LOGIC

OE

16

DD

V

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

ABSOLUTE MAXIMUM RATINGS

Output Sustaining Voltage,

Package Power Dissipation,

Operating Temperature Range,

Storage Temperature Range,

Note that the UCN5804B (dual in-line package)

and UCN5804LB (small outline IC package) are

electrically identical and share a common

terminal number assignment.

5804