SLA7044M datasheet(5/8 Pages) ALLEGRO

No de pièce	SLA7044M

Description	MICROSTEPPING, UNIPOLAR PWM, HIGH-CURRENT MOTOR CONTROLLER/DRIVER

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Fabricant	ALLEGRO [Allegro MicroSystems]

Site Internet	http://www.allegromicro.com

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FIGURE 2. PWM CONTROL (RUN MODE)

Dwg. EK-011

R1

V

V b

CONTROL

LOGIC

S

V

BB

DD

DRIVE

R 2

R

AA

B

REF/EN

V

PWM

OFF-TIME

CONTROL

SENSE

SERIAL DATA

D/A

Ø

TO CHANNEL B

ENABLE

DATA

SERIAL DATA INPUT ENABLE

In a minimum-component application, a voltage divider

provides V

REF/EN and an npn transistor provides the

required pull-down to enable the serial data input as

shown in Figure 2.

I

OUT max ≈

R

2

•

V

b

R

1

+ R

2

3 • R

S

µP STEPPER MOTOR CONTROL

Alternative REFERENCE/ENABLE input configura-

tions provide for more complete motor control. A tri-state

logic element and a voltage divider allows a fixed refer-

ence voltage, with both output disable and data enable

functions. Complete

µP control is usually accomplished

with a D/A converter as shown in Figure 3. Here, digital

control provides an output disable (>V

DD - 1 V), VREF, and

V

EN (<2.5 V).

SLA7042M AND SLA7044M

MICROSTEPPING,

UNIPOLAR PWM, HIGH-CURRENT

MOTOR CONTROLLER/DRIVERS

Dwg. WK-001

PHASE A

0

I

OUT

REGULATING THE PWM OUTPUT CURRENT

The output current (and motor coil current) waveform

is illustrated in Figure 1. Setting the maximum PWM

current trip point to meet the specified full-step running

current for the motor, I

OUT max (DATA input = 111X =

100% ratio), requires only a current-sensing resistor, R

S,

and an input reference voltage, V

REF/EN, between 0.4 V

and 2.5 V.

I

OUT max ≈

V

REF/EN

3 • R

S

FIGURE 1. PHASE A COIL CURRENT WAVEFORM

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