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

3

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.

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%

3.12W x 11.1°C/W = 32°C RISE above case temperature

Maximum Case Temperature = 150°C - 32°C = 118°C

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.

Rev. E 11/04