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SLA7026 数据表(PDF) 8 Page - Allegro MicroSystems

部件名 SLA7026
功能描述  HIGH-CURRENT PWM, UNIPOLAR STEPPER MOTOR CONTROLLER/DRIVERS
Download  12 Pages
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制造商  ALLEGRO [Allegro MicroSystems]
网页  http://www.allegromicro.com
标志 ALLEGRO - Allegro MicroSystems

SLA7026 数据表(HTML) 8 Page - Allegro MicroSystems

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115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
SLA7024M, SLA7026M, AND SMA7029M
HIGH-CURRENT PWM,
UNIPOLAR STEPPER MOTOR
CONTROLLER/DRIVERS
For given values of R
1, R2, and Vb (VREF ≈ 0.82 V), Figures 5A and 5B
illustrate output holding current as a function of R
X for two values of current-
sensing resistance (R
S).
1.0
0.6
0
0
300
500
HOLDING-CURRENT RESISTANCE in OHMS
Dwg. GK-015
100
200
400
600
R1 = 510
R2 = 100
Vb = 5 V
RS = 0.8
RS = 1.0
0.8
0.4
0.2
FIGURE 5A. HOLD-CURRENT RESISTANCE
(SLA7024M and SMA7029M)
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.
FIGURE 5B. HOLD-CURRENT RESISTANCE (SLA7026M)
The MOSFET outputs create ringing noise with PWM, but the RC filter
precludes malfunctions. The comparator operation is affected by R
5 and C3
and, thus, current overshoot is influenced by component values. Empirical
adjustment to “fine-tune” the current limit is likely.
3.0
2.0
1.0
0
300
500
700
0.5
HOLDING-CURRENT RESISTANCE in OHMS
Dwg. GK-015-1
1.5
2.5
0
100
200
400
600
800
R1 = 510
R2 = 100
Vb = 5 V
RS = 0.33
RS = 0.47


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