APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL prodlit@apexmicrotech.com

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FEATURES

• HIGH VOLTAGE — 400V (±200V)

• LOW QUIESCENT CURRENT — 10mA

• HIGH OUTPUT CURRENT — 200mA

• PROGRAMMABLE CURRENT LIMIT

• HIGH SLEW RATE — 300V/µs

APPLICATIONS

• PIEZOELECTRIC POSITIONING

• HIGH VOLTAGE INSTRUMENTATION

• ELECTROSTATIC TRANSDUCERS

• PROGRAMMABLE POWER SUPPLIES UP TO 390V

DESCRIPTION

The PA90 is a high voltage, low quiescent current MOSFET

operational amplifier designed as a low cost solution for driving

continuous output currents up to 200mA and pulse currents

up to 350mA. The safe operating area (SOA) has no second

breakdown limitations and can be observed for all type loads by

choosing an appropriate current limiting resistor. The MOSFET

output stage is biased AB for linear operation. External com-

pensation provides flexibility in choosing bandwidth and slew

rate for the application. APEX’s Power SIP package uses a

minimum of board space allowing for high density circuit boards.

The 12-pin PowerSIP package is electrically isolated.

EQUIVALENT SCHEMATIC

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TYPICAL APPLICATION

LOW POWER, PIEZOELECTRIC POSITIONING

Piezo positioning may be applied to the focusing of segment-

ed mirror systems. The composite mirror may be composed of

hundreds of elements, each requiring focusing under computer

control. In such complex systems the PA90 reduces the costs

of power supplies and cooling with its advantages of low cost

and low quiescent power consumption while increasing circuit

density with the SIP package.

PHASE COMPENSATION

GAIN

C

R

C

≥1

68pF

100Ω

≥5

10pF

100Ω

≥10

4.7pF

0Ω

≥30

NONE

0Ω

*C

ceramic (COG) type.

EXTERNAL CONNECTIONS

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12-PIN SIP

PACKAGE STYLE DP

Formed leads available

with package styles ED & EE