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SLA7071M Scheda tecnica(PDF) 7 Page - Allegro MicroSystems

Il numero della parte SLA7071M
Spiegazioni elettronici  Motor Driver IC Family
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Produttore elettronici  ALLEGRO [Allegro MicroSystems]
Homepage  http://www.allegromicro.com
Logo ALLEGRO - Allegro MicroSystems

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SLA7070M, SLA7071M,
SLA7072M, and SLA7073M
Motor Driver ICs
7
www.allegromicro.com
PWM Current Control
The description in this section is applicable to the PR and R
products.
• Blanking time
The actual operating waveforms on the SENSEx pins when
driving a motor are shown in figure 1. Immediately after PWM
turns OFF, ringing (or spike) noise on the SENSEx pins is ob-
served for a few μs. Ringing noise can be generated by various
causes, such as capacitance between motor coils and inappropri-
ate motor wiring.
Each pair of outputs is controlled by a fixed off-time (7 to
12 μs, depending on stepping mode) PWM current-control cir-
cuit that limits the load current to a desired value, ITRIP. Initially,
an output is enabled and current flows through the motor wind-
ing and the current-sense resistors. When the voltage across the
current-sense resistor equals the DAC output voltage, VTRIP, the
current-sense comparator resets the PWM latch. This turns off
the driver for the fixed off-time, during which the load induc-
tance causes the current to recirculate for the off-time period.
Therefore, if the ringing noise on the sense resistor equals and
surpasses VTRIP, PWM turns off.
To prevent this phenomenon, the blanking time is set to
override signals from the current-sense comparator for a certain
period right after PWM turns on (figure 2).
FUNCTIONAL DESCRIPTION
Figure 1. Operating waveforms on the SENSEx pins during PWM chopping
Out
Out
0
5 μs/Div.
500
ITRIP
Expanded Time Scale
t
Figure 2. SENSEx pins pattern during PWM control
tON
Blanking Time
A
A
0
ITRIP
tOFF
(Fixed)
PWM Pulse Width
t


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