LB11946 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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PS No.7946-14/14