PA78_07 Datasheet, PDF (1/5 Pages) Cirrus Logic – POWER OPERATIONAL AMPLIFIER

MICROTECHNOLOGY
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FEATURES
• A UNIQUE (Patent Pending) TECHNIQUE FOR VERY
LOW QUIESCENT CURRENT
• OVER 350 V/µS SLEW RATE
• WIDE SUPPLY VOLTAGE
• Single Supply: 20V to 350V
• Split Supplies: +/– 10V to +/– 175V
• OUTPUT CURRENT– 150mA cont. ; 200mA Pk
• UP TO 23 WATT DISSIPATION CAPABILITY
• OVER 200 kHz POWER BANDWIDTH
APPLICATIONS
• PIEZOELECTRIC POSITIONING AND ACTUATION
• ELECTROSTATIC DEFLECTION
• DEFORMABLE MIRROR ACTUATORS
• CHEMICAL AND BIOLOGICAL STIMULATORS
DESCRIPTION
The PA78 is a high voltage, high speed Precision IC power
op amp with performance and unique features not found previ-
ously in any commercially available OpAmp .
Novel input stage design of this amplifier provides extremely
high slew rates in pulse applications while maintaining low
quiescent current of under 1mA. This novel input stage also
has the effect of adding variables to the power response and
slew rate characteristics of the amplifier. To a lesser degree,
there are also input related effects on unity gain bandwidth
and phase. It is important to note that the slew rate is a strong
function of input voltage amplitude. It should be noted that the
package tab needs to be connected to a stable reference
such as GND for high slew rates. Please refer to special
considerations section for details.
The output stages are well protected with user defined
current limit although the Safe Operating Area (SOA) must
be observed for reliable protection. Proper heatsinking is
required for maintaining maximum reliability. External phase
compensation provides the user with great flexibility in trading
gain, stability and bandwidth.
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The PA78 is ideally suited to driving continuous drop ink jet
systems, in both piezo actuation and deflection applications.
The deflection amplifier shown above achieves accurate droplet
displacement at high speeds to deposit crisp, clear lot code
information on product containers. The external compensation
networks have been optimized to match the gain of the circuit
and the complex impedance of the load. The combination of
high voltage and high speed allow repeatable low cost deflec-
tion of droplets for high production environments.
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APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690–8600 • FAX (520) 888–3329 • ORDERS (520) 690–8601 • EMAIL [e-mail]