APPLICATION NOTES

MSK4411 PIN DESCRIPTIONS

V+ - is the power connection from the hybrid to the bus.

The external wiring to the pin should be sized according to

the RMS current required by the motor. This pin should be

bypassed by a high quality monolithic ceramic capacitor

for high frequencies and enough bulk capacitance to keep

the V+ power supply from drooping.

AØ OUT, BØ OUT, CØ OUT - are the connections to the

motor phase windings from the bridge output. The wiring to

these pins should be sized according to the motor current

requirements. There are no internal short circuit protection

provisions for these output pins in the hybrid. Shorts to V+

or ground from these pins must be avoided or the bridge

will be destroyed.

VRTN - is the power return connection from the hybrid to

the bus. All ground returns internal to the hybrid connect to

this point in a star configuration. All external ground con-

nections to this point should be made in a similar fashion.

The V+ capacitors should be returned to this pin as close

as possible. Wire sizing to this pin connection should be

made according to the required current.

GND - are the ground pins that connect to the ground plane

for circuitry inside the device.

BRAKE - is the pin for commanding the output bridge into

a motor brake mode. When this pin is taken low, normal

operation of the hybrid proceeds. When this pin is taken

high, the three high side switches in the bridge turn off and

the three lowside switches turn fully on. This will cause

rapid deceleration of the motor and will cease motor oper-

ation until taken low again. The pin left open is internally

pulled high.

60/120 - is a pin for selecting the orientation of the com-

mutation scheme of the motor. A high state will produce

60/300 degree commutation, where as a low state will

produce 120/240 degree commutation. Logic levels for

this input are TTL compatible. It is internally pulled high.

3

HALL A, B & C - are the hall input pins from the hall de-

vices in the motor. These pins are internally pulled up to

6.25 volts. The halls reflect a 120/240 degree commutation

scheme.

VREF - is a 6.25 volt regulated output that can be used to

power the hall devices in various motors. Up to 15 milliamps

of current is available.

SPEED COMMAND - is the input for controlling the motor

speed. The operational command voltage range should

be 0 volts to +5 volts. Negative input voltages must be

avoided while the maximum positve input voltage should

not exceed +5 volts.

8548-148 Rev. B 1/15