SLA7026M Allegro Microsystems Inc, SLA7026M Datasheet - Page 7

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