MSK4460_15 Datasheet, PDF (3/7 Pages) M.S. Kennedy Corporation – 10 Amp Output Switch Capability

APPLICATION NOTES
MSK 4460 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. The pin should be by-
passed 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
1700 μF of bulk capacitance was used in the test circuit.
The voltage range on the pin is from 16 volts up to 55 volts.
MOTOR DRIVE A,B,C - 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 V+ RTN from these pins must be
avoided or the bridge will be destroyed.
V+ RTN - is the power return connection from the module to
the bus. All ground returns connect to this point from inter-
nal to the module in a star fashion. All external ground con-
nections to this point should also be made in a similar fash-
ion. 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.
SIG GND - is a ground pin that connects to the ground plane
for all low powered circuitry inside the hybrid.
+15 V - is a regulated +15 volt output available for external
uses. Up to 20 mA is available at this pin. A 10 microfarad
capacitor should be connected as close to this pin as pos-
sible and returned to SIG GND along with a 0.22 microfarad
monolithic ceramic capacitor. CAUTION: See Voltage Regu-
lator Power Dissipation.
L1 - is a pin for connecting an external inductor to the DC -
DC converter for generating -15 volts. A 47 μH switching
inductor capable of running at 250 KHz and about 1 amp of
DC current shall be used. Connect the inductor between L1
and SIG GND.
-15 V - is a regulated -15 volt output available for external
uses. Up to 20 mA is available at this pin. A 10 microfarad
capacitor should be connected as close to this pin as pos-
sible and returned to SIG GND along with a 0.22 microfarad
monolithic ceramic capacitor. CAUTION: See Voltage Regu-
lator Power Dissipation
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
commutation direction. The maximum operational command
voltage should be ±5 volts for ±10 amps of motor current.
CURRENT MONITOR- is a pin providing a current viewing sig-
nal 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. 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 ±8 volts,
equating to ±16 amps of current peaks. In DISABLE mode,
the CURRENT MONITOR output may rail positive or nega-
tive, 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 cir-
cuits 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.
HALL A, B & C - are the hall input pins from the hall devices
in the motor. These pins are internally pulled up to 15 volts.
The halls reflect a 120/240 degree commutation scheme.
DISABLE -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 low by a 5K ohm resistor.
VOLTAGE REGULATOR POWER DISSIPATION - To figure volt-
age regulator power dissipation and junction temperature, use
the following as an example:
Given:
V+ = 28V, MSK 4460 +15V IQ = 80mA, -15V IQ = 40mA.
External Loads: +15V = 20 mA, -15V = 20 mA
-15V Converter Efficiency = 50%
PDISS due to +15V IQ,80 mA x 13V = 1.04 W
PDISS due to -15V IQ, (40 mA / 0.5) x 13V = 1.04 W
PDISS due to +15V Ext load, 20 mA x 13V = 260 mW
PDISS due to -15V Ext load, (20 mA / 0.5) x 13V = 620mW
PDISS Total = 1.04W + 1.04 W + 260 mW + 520mW = 2.86W
3.12W x 11.1°C/W = 32°C RISE above case temperature
Maximum Case Temperature = 150°C - 32°C = 118°C
3
Rev. H 2/11