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SLA7081MPR Datasheet(PDF) 9 Page - Sanken electric

Part # SLA7081MPR
Description  Unipolar 2-Phase Stepping Motor Driver ICs
Download  18 Pages
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Manufacturer  SANKEN [Sanken electric]
Direct Link  http://www.sanken-ele.co.jp/en
Logo SANKEN - Sanken electric

SLA7081MPR Datasheet(HTML) 9 Page - Sanken electric

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SANKEN ELECTRIC CO., LTD.
28610.23, Rev. 1
Unipolar 2-Phase Stepping Motor Driver ICs
SLA7080M Series
open circuit condition, the SLA7080M protection function also
provides a fixed delay, topp, before the device shuts down the
outputs. This is to avoid false detections based on ringing after
PWM turn-off. Referring to figure 6, if the breakdown confirma-
tion interval (3 breakdown cycles) plus ringing effects are shorter
than topp , the protection circuit functions correctly. However, if
ringing causes the total period to exceed topp, false detections can
occur. If this is the case, check the motor and wiring layout to
reduce ringing. Variation among device variants and applications
should be taken into consideration. One possible solution is the
addition of a capacitor between the OUTx and GND pins, which
could damp the ringing sufficiently to allow continuation of nor-
mal operation when there is no actual avalanche breakdown.
Synchronous Rectification
A dead time, approximately 0.5 μs, is set to prevent simultane-
ous turn-on of the MOSFETs at switching during synchronous
rectification. During the dead time, the regenerating current flows
through the body diode on each MOSFET chip, as shown in
figure 7.
Power Supply
There is no restriction on the on/off sequencing of the main power
supply, VBB, and the logic supply, VDD. Because the SLA7080M
series has a structure that separates the Control IC (MIC) with the
power MOSFET of the output stage, the motor power supply and
the main power supply are electrically separated. Therefore, it is
possible to drive the device by using different voltages for motor
power supply and main power supply. Note that the power sup-
plies have different voltage ranges.
Figure 6. Alternative topp scenarios: (A) no ringing, breakdown confirmed
after three cycles, (B) ringing plus three cycles is less than topp with no
effect on operations, and (C) ringing is greater than topp generates false
detections of breakdowns
tOPP
tCONFIRM
tCONFIRM
tCONFIRM
tOPP
tOPP
VOUT
VDSS
(A)
(B)
(C)
Figure 7. Synchronous rectification operation
SLA7080M
0
VREF
0
0
VG
VG
PWM On
tDEAD
tDEAD
PWM On
PWM Off
VG
VG
Stepper
Motor
Back EMF during
dead time
Normal current
VRS
RS
ION
IOFF
VRS


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