SLA7026M Allegro Microsystems Inc, SLA7026M Datasheet - Page 6

• Manufacturer Part Number: SLA7026M
• Description: IC, MOTOR CTRL/DRVR, STEPPER, 3A, SIP-18
• Manufacturer: Allegro Microsystems Inc

Specifications of SLA7026M

• Motor Type: Stepper
• No. Of Outputs: 4
• Output Current: 3A
• Output Voltage: 100V
• Supply Voltage Range: 10V To 44V
• Driver Case Style: SIP
• No. Of Pins: 18
• Operating Current: 15mA
• Operating Temperature Classification: Commercial
• Package Type: Power-Tab SIP
• Operating Supply Voltage (min): 10V
• Operating Supply Voltage (typ): 24V
• Operating Supply Voltage (max): 44V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

SLA7024M, SLA7026M,
HIGH-CURRENT PWM,
UNIPOLAR STEPPER MOTOR
CONTROLLER/DRIVERS
AND
REGULATING THE PWM OUTPUT CURRENT
Figure 1. Setting the PWM current trip point requires various external
components:
NOTE: The maximum allowable V
The voltage-divider must be selected accordingly.
Normal PWM (Full-Current/Running) Mode
and is determined by:
or, if V
SMA7029M
R
1
The output current (and motor coil current) waveform is illustrated in
I
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]
, R
OUT
R
V
REF
S
b
2
I
I
= Reference supply (typically 5 V)
is set to meet the specified running current for the motor (Figure 2)
= Current sensing resistor(s)
OUT
OUT
= Voltage-divider resistors in the reference supply circuit
is not known
FIGURE 1. PHASE A COIL CURRENT WAVEFORM
R 2
V
b
PHASE A
PHASE A
R 1
C 3
R
FIGURE 2.
1
V
R
R 5
R
APPLICATIONS INFORMATION
+ R
V
REF
S
REF
2
0
2
DETECTOR
CURRENT
•
PEAK
R 3
R
V
C 1
PWM CONTROL (RUN MODE)
b
S
OFF-TIME
CONTROL
PWM
REF
t d
input voltage is 2.0 V.
V
CC
CONTROL
INPUT
LOGIC
RECIRCULATING
A
CURRENT
CONTROL
CURRENT
CONTROL
&
V BB
SENSE
R
I OUT
S
A
Dwg. WK-001
Dwg. EK-009
B
B
™
(1)
(2)