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SLA7024 Datenblatt(PDF) 6 Page - Allegro MicroSystems

Teilenummer SLA7024
Bauteilbeschribung  HIGH-CURRENT PWM, UNIPOLAR STEPPER MOTOR CONTROLLER/DRIVERS
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Hersteller  ALLEGRO [Allegro MicroSystems]
Direct Link  http://www.allegromicro.com
Logo ALLEGRO - Allegro MicroSystems

SLA7024 Datenblatt(HTML) 6 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
FIGURE 2. PWM CONTROL (RUN MODE)
Dwg. EK-009
V
INPUT
PEAK
CURRENT
DETECTOR
CONTROL
LOGIC
S
V
BB
V
CC
CURRENT
CONTROL
&
RECIRCULATING
CURRENT
CONTROL
R 2
R 1
R
AA
B
B
R 5
C 3
R 3
C 1
REF
V
t d
PWM
OFF-TIME
CONTROL
SENSE
b
APPLICATIONS INFORMATION
REGULATING THE PWM OUTPUT CURRENT
The output current (and motor coil current) waveform is illustrated in
Figure 1. Setting the PWM current trip point requires various external
components:
V
b = Reference supply (typically 5 V)
R
1, R2 = Voltage-divider resistors in the reference supply circuit
R
S = Current sensing resistor(s)
NOTE: The maximum allowable V
REF input voltage is 2.0 V.
The voltage-divider must be selected accordingly.
Normal PWM (Full-Current/Running) Mode
I
OUT is set to meet the specified running current for the motor (Figure 2)
and is determined by:
I
OUT
V
REF
(1)
R
S
or, if V
REF
is not known
I
OUT
R
2
V
b
(2)
R
1
+ R
2
R
S
FIGURE 1. PHASE A COIL CURRENT WAVEFORM
Dwg. WK-001
PHASE A
PHASE A
0
I
OUT


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