MSK4253 Ver la hoja de datos (PDF) - M.S. Kennedy Corporation
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MSK4253 Datasheet PDF : 6 Pages
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APPLICATION NOTES
MSK 4253 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. 100µF minimum is rec-
ommended. Capacitors should be placed as close to these
pins as practical. The addition of high quality ceramic capaci-
tance will help with noise issues.
OUTPUT A, OUTPUT B- 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 out-
puts. Shorts to V+ or gound from these pins must be avoided
or the bridge will be destroyed.
RTN - is the power return connection from the module to the
bus. All internal ground returns connect to this point inside
the hybrid. All capacitors from the V+ bus should connect to
this point as close as possible. All external V+ return con-
nections 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 RSENSE A and RSENSE B
pins should be connected to this point, with connectios being
as short as possible.
RSENSE A, RSENSE B - are the power pins for the bottom
of the bridge. Both of these pins are to be connected to sense
resistor +, with connections being as short as possible.
DIS - 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 1 amp per volt
of input command, the bipolar input allows both forward and
reverse current control capability regardless of motor direc-
tion. The maximum operational command voltage should be
±5 volts for ±5 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. The input impedance is
approximately 3.75KΩ for each pin.
IN
CURRENT MONITOR - is a pin providing a current viewing
signal for external monitoring purposes. This is scaled at ±1
amp of motor current per volt output, up to a maximum of ±5
volts, or ±5 amps. Going beyond the 5 volt maximum may
result in clipping of the waveform peaks.
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.
3
PRELIMINARY Rev. - 2/05
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