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SI-7321M 数据表(PDF) 7 Page - Sanken electric

部件名 SI-7321M
功能描述  Unipolar 2-Phase Microstepping Motor Driver IC
Download  19 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

SI-7321M 数据表(HTML) 7 Page - Sanken electric

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7
SANKEN ELECTRIC CO., LTD.
Unipolar 2-Phase Microstepping Motor Driver IC
SI-7321M
28210.05
Protection Circuits Operation
Iocp
I
O
Flag
Motor coil short-circuit
Protection
Flag
V
O
V
O
V
O
V
O
(PWM)
V
DSS
Motor coil
disconnection
Protection
PWM pulse
PWM pulse
PWM pulse
topp
topp
topp
The protection functions could operate even if the fault has not
occurred; for example, if the load has not actually been discon-
nected. This can happen when the negative edge of the PWM
pulse occurs after the Load Disconnection Undetected Time,
topp , because the negative edge has been boosted by the surge
noise generated after PWM is turned off (center panel). It can
also occur when the rise time of the pulse is delayed long enough
that topp occurs before the pulse has reached full amplitude (right
panel).
To prevent this, please evaluate the application design to opti-
mize inductance of the motor harness and PCB traces so that the
transmission and slew rates of the output pulse enable it to be
completed before topp has expired.
The problem does not arise when the negative edge of the pulse
fails to transition the full pulse amplitude. Moreover, the device
may continue in normal operation if a surge suppressor capacitor
is connected between the output pins (Ox) and power ground.
Load Short
Fall time delayed
Ideal pulse duration
Rise time delayed
Load Open


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