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SLA7080MPR 数据表(PDF) 8 Page - Sanken electric

部件名 SLA7080MPR
功能描述  Unipolar 2-Phase Stepping Motor Driver ICs
Download  18 Pages
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制造商  SANKEN [Sanken electric]
网页  http://www.sanken-ele.co.jp/en
标志 SANKEN - Sanken electric

SLA7080MPR 数据表(HTML) 8 Page - Sanken electric

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SANKEN ELECTRIC CO., LTD.
28610.23, Rev. 1
Unipolar 2-Phase Stepping Motor Driver ICs
SLA7080M Series
> VOCP the motor coil short-circuit protection starts its operation.
Coil short circuit and the protection circuit behavior are illus-
trated in figure 4.
Motor Coil Open Protection
(Load Open Circuit)
(Patent pending.) This function operates by detecting polarity
reversal of voltage VRS on the internal sense resistors. After the
state is confirmed, the device shuts down the outputs. This allows
detection of a wire of the motor coil breaking. Coil open circuit
and the protection circuit behavior are illustrated in figure 5.
In a unipolar topology, an undetected broken wire on an out-
put pin (motor coil), can cause destruction of the driver due to
overheating. This is because after the wire breaks, the connected
driver MOSFET repeatedly undergoes avalanche breakdown
at PWM turn-off, due to the higher energy applied from back
electromagnetic force, as the energy stored in the motor coil is
dissipated. Avalanche breakdown occurs when the output voltage
surpasses the breakdown voltage between the drain and source of
the MOSFET. Although the MOSFETs in the SLA7080M series
have an ample avalanche breakdown rating for rated operating
temperatures, the avalanche breakdown rating decreases as the
operating temperature rises (as avalanche breakdown is repeated).
When the SLA7080M series protection circuit detects avalanche
breakdown, it allows the breakdown to repeat 3 times to prevent
false detections and then turns off the MOSFET outputs before
overheating can occur.
The detection function operates as follows. When the wire of
the motor coil is broken, the regenerating current that can reach
the MOSFET breakdown level flows during the PWM off-time.
Although the detection voltage, VRS, has negative potential in
normal operation, when a wire breaks in the motor coil, positive
potential appears during a PWM off-time. That is to say, wire
breakage in the motor coil can be detected, when VRS is detected
with positive potential during PWM off-time.
In addition to requiring three breakdown cycles to confirm the
Figure
4. Motor coil short circuit protection operation
Figure 5. Motor coil open circuit protection in unipolar configuration, (A) PWM normal
operation, (B) PWM operation with motor partially disconnected or broken wire in coil;
VM is the motor control voltage
SLA7080M
0
VREF
VOCP
Coil short circuit
VG
VG
Stepper
Motor
Normal current
VRS
RS
VRS
Output disable
Coil short circuit
SLA7080M
0
VREF
0
0
VG
VOUT
VOUT
VM
2 × VM
VDSS
VG
Stepper
Motor
IOFF
ION
VOUT
VRS
RS
VRS
IOFF
ION
SLA7080M
0
VREF
Avalanche breakdown
0
0
VG
VG
Stepper
Motor
Disconnection
RS
VRS
Open detection
(A)
(B)


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