SLA7026 datasheet(9/12 Pages) ALLEGRO

Teilenummer	SLA7026

Bauteilbeschribung	HIGH-CURRENT PWM, UNIPOLAR STEPPER MOTOR CONTROLLER/DRIVERS

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Hersteller	ALLEGRO [Allegro MicroSystems]

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V

b

DETERMINING THE MOTOR PWM FREQUENCY

The modules function asynchronously, with PWM OFF time fixed by R

3

and C

1 at input td. The OFF time can be calculated as:

t

OFF ≈ -R3 • C1 • logn (1 -

2

)

(5)

Recommended circuit constants and t

OFF are:

V

b = 5 V

R

3 = 47 kΩ

C

1 = 470 pF

t

OFF = 12 µs

FIGURE 7.

PWM FREQUENCY vs MOTOR RESISTANCE

POWER DISSIPATION CALCULATIONS

Excepting high-current applications utilizing the SLA7026M above

approximately 2.0 A at +65

°C (with 2-phase operation), the need for heat

sinks is rare. The basic constituents of conduction losses (internal power

dissipation) include:

(a) FET output power dissipation (I

OUT

2 • r

DS(on) or IOUT • VDS(ON)),

(b) FET body diode power dissipation (V

SD • IOUT), and

(c) control circuit power dissipation (V

CC • ICC).

Device conduction losses are calculated based on the operating mode

(wave drive, half-step, or 2-phase). Assuming a 50% output duty cycle:

Wave Drive = 0.5 (I

OUT

2 • r

DS(on)) + 0.5 (VSD • IOUT) + (VCC • 15 mA)

Half-Step = 0.75 (I

OUT

2 • r

DS(on)) + 0.75 (VSD • IOUT) + (VCC • 15 mA)

2-Phase = (I

OUT

2 • r

DS(on)) + (VSD • IOUT) + (VCC • 15 mA)

40

20

0

6

10

14

10

MOTOR RESISTANCE in OHMS

Dwg. GK-016

30

50

0

24

8

12

RS = 1

Ω

L/R = 1 to 3 ms

20

25

30

35

40

VCC = 24 V

VCC = 36 V

SLA7024M, SLA7026M, AND SMA7029M

HIGH-CURRENT PWM,

UNIPOLAR STEPPER MOTOR

CONTROLLER/DRIVERS

Ähnliche Beschreibung - SLA7026

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