MSK4412_15 Datasheet, PDF (3/5 Pages) M.S. Kennedy Corporation – 42V Maximum Supply Voltage: +28V Nominal

APPLICATION NOTES
MSK 4412 PIN DESCRIPTIONS
V+ - Is the main power connection from the module to
the power supply bus. The external wiring to the pin should
be sized according to the RMS current required by the
motor. The module has sufficient on board bypass ca-
pacitance for full current operation. However, there are
times when additional capacitance is necessary depend-
ing on the requirements at the host system. Placement of
external bypass capacitors shall be as close to the mod-
ules as practical.
A PHASE OUT, B PHASE OUT, C PHASE OUT- Are the
connections to the motor phase windings from the mod-
ule output. These wires should be sized according to the
current requirements of the motor. Shielding of these wires
may be necessary to help protect against EMI and should
be grounded at VRTN. Shorts from these pins to V+ must
be avoided as there are no short circuit provisions to V+.
VRTN - Is the power return connection from the module
to the power supply bus. Wiring to this point should be
sized according to required motor current. Any external
bypassing should be done as close to this pin as practical.
The ground return for the SPEED command, although con-
nected to this point in the module, shall be returned through
the GND pins on the connector so as not to experience
large current - induced voltage drops at this point.
SPEED - Is the input for controlling the motor speed. The
operational command voltage range shall be 0 volts to
+5 volts. 0 volts will correspond to the minimum duty
cycle (5%), and 4.2 volts will correspond with the maxi-
mum duty cycle (100%). 4.2 volts to 5 volts will also
correspond to a maximum duty cycle. Negative input volt-
ages are to be avoided while the maximum positive input
voltage shall not exceed +5 volts.
DIR - Is the pin for controlling direction of the motor. If
the direction is changed while the motor is spinning, the
controller will gently go into "BRAKE" mode by turning all
low-side MOSFETs on at a low duty cycle PWM. It will
increase the duty cycle until full braking is achieved. The
controller will then begin the start - up process in the
reverse direction. A logic high will run the motor in one
direction, and a logic low will run the motor in the oppo-
site direction. If the logic levels don't correspond to the
desired directions of the motor, simply swap any pair of
the Phase Out windings and the motor will run opposite.
This pin should be pulled low via a 5K resistor or grounded
if not in use.
+5V - Is the pin that is used to supply the microproces-
sor, boost regulator, and in turn the gate drive control.
Therefore it is important to keep this between +4.75V -
5.25V and keep the supply as clean as possible.
BRAKE - Is the pin that will cause the module to go into
BRAKE mode. BRAKE consists of stopping all commuta-
tion and PWM. It will then turn on all low - side MOSFETs.
This will effectively short circuit any back EMF being gen-
erated by a spinning motor. A logic high will cause BRAKE
mode to be initiated.
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8548-22 Rev. A 1/11