LB11946_09 Datasheet, PDF (14/14 Pages) Sanyo Semicon Device – PWM Current Control Stepping Motor Driver

LB11946
Usage Notes
(1) Notes on the VREF pin
Since the VREF pin inputs the reference voltage used to set the current, applications must be designed so that noise
does not occur at this pin.
(2) Notes on the ground pins
Since this IC switches large currents, care is required with respect to the ground pins.
The PCB pattern in sections where large currents flow must be designed with low impedances and must be kept
separate from the small-signal system.
In particular, the ground terminals of the E1 and E2 pin sense resistors (Re) and the external Schottky barrier diode
ground terminals must be located as close as possible to the IC ground. The capacitors between VCC and ground
and between VBB and ground must be as close as possible to the corresponding VCC and VBB pin in the pattern.
(3) Power on sequence
When turning the power systems on
VCC → logic level inputs (CLK, DATA, SET, and ST) → VREF → VBB
When turning the power systems off
VBB → VREF logic level inputs (CLK, DATA, SET, and ST) → VCC
Note that if the power supply for the logic level inputs is on when the VCC power supply is off, a bias with an unstable
state will be applied due to the protection diodes at the VCC pins, and this can cause incorrect operation.
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products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition
ranges, or other parameters) listed in products specifications of any and all SANYO Semiconductor Co.,Ltd.
products described or contained herein.
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semiconductor products fail or malfunction with some probability. It is possible that these probabilistic failures or
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limited to protective circuits and error prevention circuits for safe design, redundant design, and structural
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Any and all information described or contained herein are subject to change without notice due to
product/technology improvement, etc. When designing equipment, refer to the "Delivery Specification" for the
SANYO Semiconductor Co.,Ltd. product that you intend to use.
Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed
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This catalog provides information as of February, 2009. Specifications and information herein are subject
to change without notice.
PS No.7946-14/14