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SLA7071M データシート(PDF) 8 Page - Allegro MicroSystems

部品番号 SLA7071M
部品情報  Motor Driver IC Family
Download  12 Pages
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メーカー  ALLEGRO [Allegro MicroSystems]
ホームページ  http://www.allegromicro.com
Logo ALLEGRO - Allegro MicroSystems

SLA7071M データシート(HTML) 8 Page - Allegro MicroSystems

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SLA7070M, SLA7071M,
SLA7072M, and SLA7073M
Motor Driver ICs
8
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036
SLA7060M Series
SLA7070M Series
VBB
RSExt
RSInt
VS
VS
VS
FET Gate
Signal
FET Gate
Signal
Vg
Stepper Motor
Stepper Motor
VBB
Ioff
Ion
Ioff
Ion
VS
Vg
Vg
Vg
Vg
Vg
PWM On
PWM Off
PWM On
Back EMF at Dead Time
Vg
+V
VREF
0
t
Vg
+V
VREF
0
0
0
t
t
t
PWM On
PWM Off
PWM On
Dead
Time
Dead
Time
Figure 3. Synchronous rectification operation. During Dead Time,
the Back EMF flows through the body diode of the MOSFET
PWM Off Period
The PWM off-time for the SLA7070M series is controlled
as a fixed time by an internal oscillator.
In addition, the SLA7070M series provide a function that
decreases losses occurring when the PWM turns off. This func-
tion dissolves back EMF stored in the motor coil at MOSFET
turn-on, as well as at PWM turn-on (synchronous rectification
operation).
Figure 3 shows the difference in back EMF generative
system between the SLA7060M series and SLA7070M series.
The SLA7060M series performs on–off operations using only
the MOSFET on the PWM-on side, but the SLA7070M series
also performs on–off operations using only the MOSFET on the
PWM-off side. To prevent simultaneous switching of the MOS-
FETs at synchronous rectification operation, the IC has a dead
time of approximately 0.5 μs. During dead time, the back EMF
flows through the body diode on the MOSFET.


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