MSK1695 datasheet(3/7 Pages) MSK

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APPLICATION NOTES

MSK 1695 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 mono-

lithic 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 wir-

ing to these pins should be sized according to the mo-

tor 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 exter-

nal ground connections 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 operation until taken low again.

The pin left open is internally pulled high.

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

commutation 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.

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

devices 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.

PRELIMINARY

Rev. B 11/06

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