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

FEATURES

• SURFACE MOUNT PACKAGE

• MONOLITHIC MOS TECHNOLOGY

• LOW COST

• HIGH VOLTAGE OPERATION—350V

• LOW QUIESCENT CURRENT—2mA

• NO SECOND BREAKDOWN

• HIGH OUTPUT CURRENT—120 mA PEAK

APPLICATIONS

• TELEPHONE RING GENERATOR

• PIEZO ELECTRIC POSITIONING

• ELECTROSTATIC TRANSDUCER & DEFLECTION

• DEFORMABLE MIRROR FOCUSING

DESCRIPTION

The PA44 is a high voltage monolithic MOSFET operational

amplifier achieving performance features previously found

only in hybrid designs while increasing reliability. Inputs are

protected from excessive common mode and differential mode

voltages. The safe operating area (SOA) has no second

breakdown limitations and can be observed with all type loads

by choosing an appropriate current limiting resistor. External

compensation provides the user flexibility in choosing

optimum gain and bandwidth for the application.

The PA44 is packaged in Apex's PSOP1 non-hermetic

surface mountable dual in line package. The metal back of the

package is tied to –Vs.

The PA44 is set for a gain of 38.5 boosting the 2.33V signal

to 90V. The recommended compensation for gains above 30

is used. If capacitive loading is at least 330pF at all times, the

recommended snubber network may be omitted. The 27 ohm

resistor sets current limit to a nominal value of 111mA to insure

peak currents out of at least 78mA.

Telephone Ring Generator

PHASE COMPENSATION

Gain

C

C

R

C

1

18pF

2.2K

Ω

≥10

10pF

2.2K

Ω

≥30

3.3pF

2.2K

Ω

EXTERNAL CONNECTIONS

EQUIVALENT SCHEMATIC

MUR120

IN6300A

.22

27

100

330pf

2.2K

3.3pF

.22

100K

2.67K

2.5K + 15

10K

10K

ICL8038

11

10

8

7

2

6

5

4

PA44

MUR130

IN6300A

90Vrms

82K

*

140V

–140V

–15V

* 1.5

µF @ 16Hz

1.2

µF @ 20Hz

15V

MUR120

MUR130

TYPICAL APPLICATION

HTTP://WWW.APEXMICROTECH.COM

(800) 546-APEX

(800) 546-2739

MICROTECHNOLOGY

HIGH VOLTAGE POWER OPERATIONAL AMPLIFIER

PA44

–IN

OUT

+V

S

–V

S

+IN

D2

D3

D4

D5

Q5

Q4

5

7

12

21

15

13

Q1

Q11

Q12

D1

Q2

Q6

Q8

Q13

SUB

Q14

Q10

Q9

Q7

Q3

I

LIM

COMP

COMP

19

17

TOP VIEW

OUT

COMP

COMP

100

Ω

13

15

17

19

21

12

15

7

–IN

NC

+IN

*

330pF

*