APPLICATION NOTES

IN

MSK4361 PIN DESCRIPTIONS

AV+, BV+, CV+ - are the power connections from the hybrid

to the bus.The pins for each phase are brought out separately

and must be connected together to the V+ source externally.

The external wiring to these pins should be sized according to

the RMS current required by the motor. These pins should be

bypassed by a high quality monolithic ceramic capacitor for high

frequencies and enough bulk capacitance for keeping the V+

supply from drooping. 78 µF of ceramic capacitance and 6200

µF of bulk capacitance was used in the test circuit. The voltage

range on these pins is from 16 volts up to 75 volts.

AØ, BØ & CØ - are the connections to the motor phase windings

from the bridge output. The wiring to these pins should be sized

according to the required current by the motor. There are no short

circuit provisions for these outputs. Shorts to V+ or gound from

these pins must be avoided or the bridge will be destroyed.

AVS, BVS, CVS - are the return pins on the bottom of each half

bridge. They are brought out separately and should be connected

together externally to allow the current from each half bridge to

flow through the sense resistor. The wiring on these pins should

be sized according to the current requirements of the motor.

RTN - is the power return connection from the module to the

bus. All ground returns connect to this point from internal to the

module in a star fashion. All external ground connections to this

point should also 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.

LGND - is an isolated ground connection to the RTN pin of the

hybrid that is connected internally. For any circuitry that needs

to be connected to the RTN pin without the influence of current

flow through RTN should be connected at this point.

GND - is a ground pin that connects to the ground plane for all

low powered circuitry inside the hybrid.

+15 VIN - is the input for applying +15 volts to run the low power

section of the hybrid. This pin should be bypassed with a 10 µF

capacitor and a 0.1 µF capacitor as close to this pin as possible.

-15 VIN - is the input for applying -15 volts to run the low power

section of the hybrid. This pin should be bypassed with a 10 µF

capacitor and a 0.1 µF capacitor as close to this pin as possible.

CURRENT COMMAND (+,-) - are differential inputs for controlling

the module in current mode. Scaled at ±3 amps per volt of input

command, the bipolar input allows both forward and reverse cur-

rent control capability regardless of motor commutation direction.

The maximum operational command voltage should be ±10 volts

for ±30 amps of motor current.

3

CURRENT MONITOR - is a pin providing a current viewing signal

for external monitoring purposes. This is scaled at ±3 amps of

motor current per volt output, up to a maximum of ±10 volts, or ±30

amps. As ±30 amps is exceeded, the peaks of the waveform may

become clipped as the rails of the amplifiers are reached. This

voltage is typically ±12.5 volts, equating to ±37 amps of current

peaks. In DIS mode, the CURRENT MONITOR output may rail

positive or negative, depending on internal bias currents. When

re-enabled, this output will resume expected operation.

E/A OUT - is the current loop error amp output connection. It is

brought out for allowing various loop compensation circuits to be

connected between this and E/A-.

E/A- - is the current loop error amp inverting input connection.

It is brought out for allowing various loop compensation circuits

to be connected between this and E/A OUT.

CLOCK SYNC - is an input for synchronizing to an external clock.

The sync circuit will trigger on the edges of the applied clock and

effectively shorten the period of the internal oscillator on each

cycle. The frequency can be increased from a free running 22

KHz to 25 KHz maximum. The clock applied shall be 15 volts

amplitude with at least a 10% duty cycle.

REFOUT - is a 6.25 volt regulated output to be used for powering

the hall devices in various motors. Up to 15 mA of output current

is available.

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 can reflect a 120/240 degree commutation scheme or a

60/300 degree scheme.

BRAKE - is a pin for commanding the output bridge into a motor

BRAKE mode. When pulled low, normal operation commences.

When pulled high, the 3 high side bridge switches turn on, causing

rapid deceleration of the motor and will cease motor operation

until pulled high again. Logic levels for this input are TTL com-

patible. It is internally pulled high.

DIS - is a pin for externally disabling the output bridge. A TTL

logic low will enable the bridge and a TTL logic high will disable

it. It is internally pulled up by a 100µAmp pullup.

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, whereas a low state will produce 120/240 degree

commutation. Logic levels for this input are TTL compatible. It is

internally pulled high.

8548-146 Rev. J 1/15