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SLA7072M Datasheet(PDF) 9 Page - Allegro MicroSystems

Part # SLA7072M
Description  Motor Driver IC Family
Download  12 Pages
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Manufacturer  ALLEGRO [Allegro MicroSystems]
Direct Link  http://www.allegromicro.com
Logo ALLEGRO - Allegro MicroSystems

SLA7072M Datasheet(HTML) 9 Page - Allegro MicroSystems

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SLA7070M, SLA7071M,
SLA7072M, and SLA7073M
Motor Driver ICs
9
www.allegromicro.com
Stepper Motor
Coil Short Circuit
Coil Short Circuit
Normal Operation
Output Disable
VM
VOCP
+V
VREF
0
t
RSInt
VS
VS
Vg
Figure 4. Motor coil short circuit protect circuit operation. Overcurrent that flows with-
out passing the sense resistor is undetectable. To recover the circuit after protection oper-
ates, VDD must be cycled and started up again.
Protection Functions: PR Types
The PR types of the SLA7070M series include a motor coil
short-circuit protection circuit and a motor coil open protection
circuit. They are described in this section.
• Motor Coil Short-Circuit Protection (Load Short) Circuit
This protection circuit, embedded in the SLA7070M series,
begins to operate when the device detects an increase in the volt-
age level on the sense resistor, VSInt .
The voltage at which motor coil short-circuit protection
starts its operation, VOCP, is set at approximately 0.7 V. The out-
put is disabled at the time the protection circuit starts.
In order for the motor coil short-circuit protection circuit to
operate, VSInt must be greater than VOCP.
Overcurrent that flows without passing the sense resistor
is undetectable. To resume the circuit after protection operates,
VDD must be cycled.
• Motor Coil Open Protection
Details of this functions is not disclosed yet due to our pat-
ent policy.


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