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

FEATURES

• MONOLITHIC MOS TECHNOLOGY

• PROGRAMMABLE I

• LOW COST

• HIGH VOLTAGE OPERATION—150V

• HIGH SLEW RATE—27V/

µs

• HIGH POWER—5A, 75W DISSIPATION

APPLICATIONS

• MAGNETIC DEFLECTION

• PA AUDIO

• MOTOR DRIVE

• NOISE CANCELLATION

DESCRIPTION

The PA46 is a high power monolithic MOSFET operational

amplifier that achieves performance levels unavailable even in

many hybrid amplifier designs. Inputs are protected from

excessive common mode and differential mode voltages as

well as static discharge. 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. Class C

operation with resulting low quiescent current is pin program-

mable. A shutdown input turns off the output stage.

This circuit utilizes a beryllia oxide (BeO) substrate to

minimize thermal resistance. The 10-pin power SIP package

is electrically isolated.

EQUIVALENT SCHEMATIC

TYPICAL APPLICATION

PA46

+80

–20

YOKE

±2.5A 7µSec Retrace

Horizontal Deflection Coil Amplifiers

10

4

1

2

6

8

9

5

Horizontal deflection amplifiers require both high speed and

low distortion. The speed at which current can be changed in a

deflection coil is a function of the voltage available from the op

amp. In this application an 80 volt power supply is used for the

retrace polarity to provide a 7

µSec retrace time, half of which is

required for amplifier slewing. This circuit can perform 15.75

KHz deflection in up to 50

µH coils at up to 5A p-p.

CC1

CC2

8

7

3

9

Q19

Q17

Q16

Q15

Q14

Q9

Q10

Q7

D7

Q21

Q20

+IN

–IN

Q11

Q12

D4

D2

Q3

D3

D5

Q8

Q13

Q24

D1

Q2

SHDN

Q5

Q6

CURRENT

SENSE

OUTPUT

DRIVE

6

5

10

1

2

4

10

89

67

45

12

3

–IN

OUTPUT

Phase Compensation

Gain

≥10

10pF

1K

Ω

≥ 1

68pF

1K

Ω

HTTP://WWW.APEXMICROTECH.COM

(800) 546-APEX

(800) 546-2739

MICROTECHNOLOGY

HIGH VOLTAGE POWER OPERATIONAL AMPLIFIER

PA46

EXTERNAL CONNECTIONS

Package: SIP02