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

FEATURES

• HIGH VOLTAGE — 900V (

±450V)

• LOW QUIESCENT CURRENT — 1.6mA

• HIGH OUTPUT CURRENT — 100mA

• PROGRAMMABLE CURRENT LIMIT

APPLICATIONS

• HIGH VOLTAGE INSTRUMENTATION

• PROGRAMMABLE POWER SUPPLIES UP TO

±430V

• MASS SPECTROMETERS

• SEMICONDUCTOR MEASUREMENT EQUIPMENT

DESCRIPTION

The PA95 is a high voltage, MOSFET operational amplifier

designed as a low cost solution for driving continuous output

currents up to 100mA and pulse currents up to 200mA into

capacitive loads. The safe operating area (SOA) has no

second breakdown limitations and can be observed for all load

types by choosing an appropriate current limiting resistor. The

MOSFET output stage is biased AB for linear operation.

External compensation provides flexibility in choosing band-

width and slew rate for the application. APEX’s Power SIP04

package uses a minimum of board space allowing for high

density circuit boards.

EQUIVALENT SCHEMATIC

TYPICAL APPLICATION

Piezo positioning may be applied to the focusing of seg-

mented mirror systems. The composite mirror may be com-

posed of hundreds of elements, each requiring focusing under

computer control. In such complex systems the PA95 reduces

the costs of power supplies and cooling with its advantages of

low cost and low quiescent power consumption while increas-

ing circuit density with the SIP package.

HTTP://WWW.APEXMICROTECH.COM

(800) 546-APEX

(800) 546-2739

MICROTECHNOLOGY

HIGH VOLTAGE POWER OPERATIONAL AMPLIFIER

PA95

F

R

PA95

IN

R

PIEZO DRIVE

S

–V

S

+V

OUT

V

COMPUTER

FOCUS

COMMAND

VOLTAGE

CL

R

1

2

10

8

7

12

EXTERNAL CONNECTIONS

PACKAGE SIP04

Q1

Q2

R1 R2

C1

12

R3

Q3

CC1

CC2

Q6

Q5

R5

R8

2

1

R9

Q15

R11

10

R12

Q16

Q12

Q8

R4

R7

7

8

6

4

Q4

ILIM

OUT

Q14

R10

Q13

Q11

–IN

+IN

R6

PHASE COMPENSATION

GAIN

≥10

4.7pF

R

.7

I

LIM

12

4

6

7

8

10

12

**

µF or greater ceramic power supply bypassing required.

–IN

+IN

CC1

–Vs

+Vs

PATENT PENDING