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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.

TYPICAL APPLICATION

The typical application diagram shows a bridge connection

of the two amplifiers inside a dual PA79 and provides output

voltage swing twice that of one amplifier. Two possible situ-

ations where there is an advantage would be in applications

with low supply voltages, or applications that operate amplifiers

near their maximum voltage ratings in which a single amplifier

could not provide sufficient drive. The bridge connection also

effectively doubles the slew rate, and non-linearity becomes

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 – Per Amplifier –

150mA cont. ; 200mA Pk

• UP TO 26 WATT DISSIPATION CAPABILITY (DUAL)

• OVER 200 kHz POWER BANDWIDTH

APPLICATIONS

• PIEZOELECTRIC POSITIONING AND ACTUATION

• ELECTROSTATIC DEFLECTION

• DEFORMABLE MIRROR ACTUATORS

• CHEMICAL AND BIOLOGICAL STIMULATORS

DESCRIPTION

The PA79 is a dual high voltage, high speed Precision IC

power op amp with performance and unique features not

found previously in any commercially available OpAmp. This

approach provides a cost-effective, high density solution to

applications where multiple amplifiers are required.

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

M I C R O T E C H N O L O G Y

PA79

20–PIN PSOP

PACKAGE STYLE DK

BLOCK DIAGRAM