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FEATURES
• LOW COST
• HIGH VOLTAGE - 450 VOLTS
• HIGH OUTPUT CURRENT - 20 AMPS
• 9kW OUTPUT CAPABILITY
• VARIABLE SWITCHING FREQUENCY
• IGBT FULL BRIDGE OUTPUT
APPLICATIONS
• BRUSH MOTOR CONTROL
• MRI
• MAGNETIC BEARINGS
• CLASS D SWITCHMODE AMPLIFIER
58-PIN DIP
PACKAGE STYLE KC
TYPICAL APPLICATION
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DESCRIPTION
The MSA260 is a surface mount constructed PWM amplifier
that provides a cost effective solution in many industrial applica-
tions. The MSA260 offers outstanding performance that rivals
many much more expensive hybrid components. The MSA260
is a complete PWM amplifier including an oscillator, comparator,
error amplifier, current limit comparators, 5V reference, a smart
controller and a full bridge IGBT output circuit. The switching
frequency is user programmable up to 50 kHz. The MSA260 is
built on a thermally conductive but electrically insulating substrate
that can be mounted to a heatsink.
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EQUIVALENT CIRCUIT DIAGRAM
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TORQUE MOTOR CONTROL
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With the addition of a few external components the MSA260
becomes a motor torque controller. In the MSA260 the source
terminal of each low side IGBT driver is brought out for current
sensing via R
S
A and R
S
B. A1 is a differential amplifier that
amplifies the difference in currents of the two half bridges. This
signal is fed into the internal error amplifier that mixes the cur-
rent signal and the control signal. The result is an input signal
to the MSA260 that controls the torque on the motor.
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EXTERNAL CONNECTIONS
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R
RAMP
VIEW FROM
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OSC
C3
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POINT
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