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SLA7080MPR 数据表(PDF) 7 Page - Sanken electric

部件名 SLA7080MPR
功能描述  Unipolar 2-Phase Stepping Motor Driver ICs
Download  18 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

SLA7080MPR 数据表(HTML) 7 Page - Sanken electric

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SANKEN ELECTRIC CO., LTD.
28610.23, Rev. 1
Unipolar 2-Phase Stepping Motor Driver ICs
SLA7080M Series
occurs when the short blanking time is selected, the problem may
be eased by the selection of the longer blanking time.
A comparison of these trade-offs is provided in the following
table (comparisons assume that operating conditions other than
the SLA7080M, such as motors, motor power supply voltage,
REF input voltages and so forth, as well as circuit constants, are
identical in each case).
Parameter
Better Performance
Internal Blanking Set Time
Short or Long
Minimize PWM On-time (minimum)
Short
Maximize Ringing Noise Suppression
Long
Minimize Coil Current
Short
Synchronous Control
The SLA7080M series has a chopping synchronous function
to prevent noise which may occasionally be generated during
the motor Hold state. This function can be operated by setting
the SYNC pin to logic high, which generates a timing signal to
synchronize the chopping of the A and B phases. (This function
operates identically to that of the SLA7070M.)
This function should be used only during self-excitation PWM
control. The use of synchronous control during normal stepping
motor rotation is not recommended because it produces less
motor torque or may cause motor vibration because the control
current does not stabilize.
Protection Circuit
A built-in protection circuit detects against motor coil opens and
shorts. Operation of the protection circuit disables all of the out-
puts, and sets the FLAG pin. To leave protection mode and return
to normal operation, cycle the logic power supply, VDD.
Protection is activated by sensing voltage on the internal sensing
resistors, RS. Overcurrent that flows without passing the sense
resistors cannot be detected. Therefore, this does not detect an
overcurrent condition resulting from the OUT pins or SENSE
pins shorting to GND.
Protection against motor coil opens is available only during
PWM operation. Therefore, it does not work during constant volt-
age driving, when the motor is rotating at high speed.
Motor Coil Short Circuit Protection
(Load Short Circuit)
This function operates by detecting voltage VRS on the internal
sense resistors in the same manner as the current control function.
The threshold voltage, VOCP, is set to 0.7 V typical. When VRS
ITRIP
5 μs/div
I
TRIP
500 ns/div
20 μs/div
Figure 3. PWM waveform exhibiting seeking behavior
Figure 2. Ringing on PWM waveform while driving a motor. The circled area in
panel A is expanded in time and shown in panel B.
(A)
(B)


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