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SLA7082MPR Folha de dados(PDF) 6 Page - Sanken electric

Nome de Peças SLA7082MPR
Descrição Electrónicos  Unipolar 2-Phase Stepping Motor Driver ICs
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Fabricante Electrônico  SANKEN [Sanken electric]
Página de início  http://www.sanken-ele.co.jp/en
Logo SANKEN - Sanken electric

SLA7082MPR Folha de dados(HTML) 6 Page - Sanken electric

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SANKEN ELECTRIC CO., LTD.
28610.23, Rev. 1
Unipolar 2-Phase Stepping Motor Driver ICs
SLA7080M Series
Logic Block
This circuit block is integrated on the Control IC (MIC). It oper-
ates by the logic power supply, VDD , and propagates signals to
each circuit block in accordance with the logic input signals.
Regulator Circuit
This circuit block is integrated on the Control IC (MIC). The
integrated regulator circuit is used in driving the output MOSFET
gates and in powering other internal linear circuits.
Dual Phase Output Control
The SLA7080M series allows dual phase operation based on
external input to the INx pins. The phase-switching logic is
shown in the following table:
Phase A [B]
INA [INB]
I¯¯N¯¯A¯ [ I¯¯N¯¯B¯]
OUTA [OUTB]*
¯O¯¯U¯¯T¯¯A¯ [¯O¯¯U¯¯T¯¯B¯ ]*
Low
Low
OFF
OFF
High
Low
ON
OFF
Low
High
OFF
ON
High
High
OFF
OFF
*OUT indicates power MOSFET drain state (does not
indicate PWM operation)
PWM Control
This circuit block is integrated on the Control IC (MIC). This is
the main circuit block for pulse width modulated (PWM) control
of self-excitation and external excitation for motor driving. An
illustration of PWM behavior is shown in figure 1.
PWM control mode is set by the SYNC pin. Set SYNC to logic
high for synchronous PWM, and set it to logic low for asynchro-
nous PWM.
PWM Off-Time, toff, (for self-excitation), minimum off-time (for
external excitation), and PWM Minimum On-Time (blanking
time), ton(min), are clocked by means of the built-in oscillator.
The length of toff is fixed internally. Like in the SLA7070M
series, the SLA7080M series has a power-saving function that
reduces power consumption during toff. This function recirculates
electromotive force that is stored in the motor coil while the
power MOSFETs are turned on.
The time interval during which the output MOSFETs are on is ton.
The minimum duration for the PWM Minimum On-time, ton(min),
is effectively the blanking time selected, even if the application
attempts to shorten ton in order to limit current. The minimum coil
current is at ton(min), so when the coil current is limited at power-
down or other events, it can be no shorter than the blanking time.
Blanking Time
The blanking time function is provided to limit current in order
to suppress ringing immediately after PWM turns on, and to
improve current control tracking. Blanking time in effect deter-
mines PWM Minimum On-Time, ton(min). The length of the blank-
ing time is selected by the B_SEL pin. Set B_SEL to logic high
for 3.2 μs blanking time, and set it to logic low for 5.2 μs.
Some ringing is generated for a few microseconds after PWM
switching (see figure 2). Ringing can result from various causes,
such as capacitance between motor cells, or inappropriate motor
wiring. To suppress this behavior, the blanking time selection sets
a minimum time interval during which current detection signals
from the current sense comparators are ignored after a PWM
switch-on.
Current control (tracking) in the SLA7080M series is regulated
by comparing the detection voltage on the sense resistor, VRS ,
with the reference voltage, VREF. If the ringing noise causes VRS
to exceed VTRIP, the comparator is activated and PWM turns off.
Current control performance at shorter PWM waveforms can
be improved by shortening the blanking time, but this decreases
the effectiveness of ringing suppression, resulting in the seek-
ing behavior shown in figure 3.) To solve this problem, the
SLA7080M series is designed to allow dynamic selection of
blanking time duration. In the event that the seeking behavior
Functional Description
Figure 1. PWM waveform on SLA7080M sense resistor, RS; toff is fixed and
the blanking time, toff(min), is dynamically selectable.
0
VOUT
ton(min)
ITRIP
One PWM Cycle
ton
toff
Phase A [B]
A [ B ]
A [ B ]


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