MSK4324ES Ver la hoja de datos (PDF) - M.S. Kennedy Corporation
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MSK4324ES Datasheet PDF : 7 Pages
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APPLICATION NOTES
MSK 4324 PIN DESCRIPTIONS
AV+, BV+, CV+ - are the power connections from the hy-
brid 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.
Note: this is a power sequence sensitive part. Either turn on all
supplies simultaneously or provide ±15V first, then V+ voltages.
AØ, BØ & CØ- are the connections to the motor phase wind-
ings from the bridge output. The wiring to these pins should
be sized according to the current required by the motor. There
are no short circuit provisions for these outputs. Shorts to
V+ or ground 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 require-
ments 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.
Note: this is a power sequence sensitive part. Either turn on all
supplies simultaneously or provide ±15V first, then V+ voltages.
-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.
Note: this is a power sequence sensitive part. Either turn on all
supplies simultaneously or provide ±15V first, then V+ voltages.
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 com-
mutation direction. The maximum operational command volt-
age should be ±10 volts for ±10 amps of motor current.
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
±10 volts, or ±10 amps. As ±10 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 ±12.5 amps of current peaks.
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 connec-
tion. It is brought out for allowing various loop compensa-
tion 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 ap-
plied clock and effectively shorten the period of the internal
oscillator on each cycle. The frequency can be increased
from a free running 14 KHz to 20 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 pow-
ering 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
IN motor BRAKE mode. When pulled low, normal operation com-
mences. When pulled high, the 3 high side bridge switches
turn off and the 3 low side bridge switches turn on, causing
rapid deceleration of the motor and will cease motor opera-
tion until pulled high again. Logic levels for this input are TTL
compatible. It is necessary to toggle ON and OFF BRAKE
after power up before normal operation can begin. This is
necessary because of the bootstrap high-side power supplies
for each phase. These are not continuous high-side supplies
and need to be refreshed by turning on the low side switches
momentarily with the BRAKE. It is internally pulled high.
DIS - is a pin for externally disabling the output bridge. A
15V CMOS logic low will enable the bridge and a 15V CMOS
logic high will disable it. After using the DIS pin, the BRAKE
must be cycled ON and OFF before normal operation will be-
gin. This is due to the bootstrap high-side supplies needing
refreshing.
60/120- is a pin fpr selecting the orientation of the commuta-
tion sheme 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.
ILIMIT ADJUST - is a pin for externally adjusting the current
limit point. By placing a resistor to ground from this pin, a
voltage divider is created and the current limit will be lowered.
Without an external resistor, the current limit is set at 13 Amps.
3
PRELIMINARY Rev. - 2/06
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