SLA7026 查看數據表（PDF） - Allegro MicroSystems

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SLA7026

HIGH-CURRENT PWM, UNIPOLAR STEPPER MOTOR CONTROLLER/DRIVERS

Allegro MicroSystems 

SLA7024M, SLA7026M, AND SMA7029M

HIGH-CURRENT PWM,

UNIPOLAR STEPPER MOTOR

CONTROLLER/DRIVERS

For given values of R1, R2, and Vb (VREF ≈ 0.82 V), Figures 5A and 5B

illustrate output holding current as a function of RX for two values of current-

sensing resistance (RS).

1.0

RS = 0.8 Ω

0.8

RS = 1.0 Ω

0.6

0.4

R1 = 510 Ω

R2 = 100 Ω

Vb = 5 V

0.2

0

0

100

200

300

400

500

600

HOLDING-CURRENT RESISTANCE in OHMS

Dwg. GK-015

FIGURE 5A. HOLD-CURRENT RESISTANCE

(SLA7024M and SMA7029M)

3.0

R1 = 510 Ω

2.5

R2 = 100 Ω

Vb = 5 V

2.0

RS = 0.33 Ω

RS = 0.47 Ω

1.5

1.0

0.5

0

0

100

200

300

400

500

600

700

800

HOLDING-CURRENT RESISTANCE in OHMS

Dwg. GK-015-1

FIGURE 5B. HOLD-CURRENT RESISTANCE (SLA7026M)

NOTE: Holding current determines holding torque, which is normally

greater than running torque. Consult motor manufacturer for recommended

safe holding current and motor winding temperature limits in “standstill” or

“detent” mode.

The MOSFET outputs create ringing noise with PWM, but the RC filter

precludes malfunctions. The comparator operation is affected by R5 and C3

and, thus, current overshoot is influenced by component values. Empirical

adjustment to “fine-tune” the current limit is likely.

115 Northeast Cutoff, Box 15036

™

Worcester, Massachusetts 01615-0036 (508) 853-5000

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