MSK4251_15 Datasheet, PDF (3/6 Pages) M.S. Kennedy Corporation – 75 Volt Motor Supply Voltage

APPLICATION NOTES
MSK 4251 PIN DESCRIPTIONS
AV+, BV+ - are the power connections from the hybrid to
the bus. All pins for the motor voltage supply should be con-
nected together to share the current through the pins in the
hybrid. The external wiring to these pins should be sized
according to the RMS current required by the motor. A high
quality monolithic ceramic capacitor for high frequencies and
enough bulk capacitance for keeping the V+ supply from
drooping should bypass these pins. 1000μF is recommended.
Capacitors should be placed as close to these pins as practi-
cal.
AØ, BØ - 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. All pins for each phase should be con-
nected together to share the current through the three pins in
the hybrid.
RTN - is the power return connection from the module to the
bus. All internal ground returns connect to this point inside
the hybrid. All three pins should be connected together to
share the current. All capacitors from the V+ bus should
connect to this point as close as possible. All external V+
return connections should be made as close to these pins as
possible. Wiring sizing to this pin should be made according
to the required current.
GND - is the return point for the low powered circuitry inside
the hybrid. All GND pins should be tied together. All capaci-
tors for bypassing the + and -15V supplies should be tied at
this point, as close to the pins as possible. Any ground plane
connections for low powered and analog citcuitry outside the
hybrid should be tied to this point.
+15VIN - is the input for applying +15 volts to run the low
power section of the hybrid. Both pins should be used to-
gether for optimum operation. These pins should be bypassed
with a 10μF capacitor and a 0.1μF capacitor as close to these
pins as possible.
-15VIN - is the input for applying -15 volts to run the low
power section of the hybrid. Both pins should be used to-
gether for optimum operation. These pins should be bypassed
with a 10μF capacitor and a 0.1μF capacitor as close to these
pins as possible.
SENSE RESISTOR + - is the top of the sense resistor for
sensing the bridge current and closing the loop. The bottom
of the sense resistor is RTN. All the AV- and BV- pins should
be connected to this point.
AV-,BV- - are the power pins for the bottom of the bridge.
These are to be connected to sense resistor +.
DISABLE - is a pin for externally disabling the output bridge.
A TTL logic low will enable the bridge and a TTL high will
disable it. It is internally pulled up by a 100μAmp pull-up.
CURRENT COMMAND (+,-) - are differential inputs for con-
trolling the module in current mode. Scaled at 2 amps per
volt of input command, the bipolar input allows both forward
and reverse current control capability regardless of motor com-
mutation direction. The maximum operational command volt-
age should be ±5 volts for ±10 amps of motor current.
Going beyond 5 volts of command voltage will force the bridge
to conduct more than the desired maximum current. There is
internal current limiting that will ultimately limit the absolute
maximum current being output by the bridge.
CURRENT MONITOR- is a pin providing a current viewing
signal for external monitoring purposes. This is scaled at ±2
amps of motor current per volt output, up to a maximum of
±5 volts, or ±10 amps. Going beyond the 5 volt maximum
IN ^{may result in clipping of the waveform peaks. In DISABLE}
mode, the CURRENT MONITOR output may rail positive or
negative, depending on internal bias currents. When re-en-
abled, this output will resume expected operation.
E/A OUT - is the current loop error amplifier output. 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 amplifier inverting input. It is
brought out for allowing various loop compensation circuits
to be connected between this and E/A OUT.
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Rev. F 2/11