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SLA7024M Fiches technique(PDF) 7 Page - Allegro MicroSystems

No de pièce SLA7024M
Description  HIGH-CURRENT PWM, UNIPOLAR STEPPER MOTOR CONTROLLER/DRIVERS
Download  12 Pages
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Fabricant  ALLEGRO [Allegro MicroSystems]
Site Internet  http://www.allegromicro.com
Logo ALLEGRO - Allegro MicroSystems

SLA7024M Fiches technique(HTML) 7 Page - Allegro MicroSystems

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For given values of R
1, R2, and Vb (VREF ≈ 0.82 V), Figure 3 illustrates
output current as a function of current-sensing resistance (R
S).
Reduced/Holding Current Mode
Additional circuitry (Figure 4) enables reducing motor current. The
external transistor changes the voltage-divider ratio, V
REF, and reduces the
output current. I
HOLD is determined by resistors R2 and RX in parallel:
I
HOLD
R
2 RX
V
b
(3)
R
1 R2 + R1 RX + R2 RX
R
S
or
I
HOLD
R
2
V
b
(4)
R
1 + R2
R
S
where R
2= the equivalent value of R2 and RX in parallel.
FIGURE 4. HOLD CURRENT MODE
FIGURE 3. CURRENT-SENSING RESISTANCE
3.0
2.0
1.0
0
1.5
2.5
3.5
0.5
CURRENT-SENSING RESISTANCE in OHMS
Dwg. GK-014
1.5
2.5
0
0.5
1.0
2.0
3.0
4.0
R1 = 510
R2 = 100
Vb = 5 V
RX =
SLA7024M & SMA7029M MAX.
SLA7026M MAX.
Dwg. EK-010
RS
V
REF
SENSE
R 1
R 2
HOLD
R 5
C 3
R X
V b
SLA7024M, SLA7026M, AND SMA7029M
HIGH-CURRENT PWM,
UNIPOLAR STEPPER MOTOR
CONTROLLER/DRIVERS


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