OUTPUT A

OUTPUT

STAGE

I/P

OUTPUT B

DEC

B

PREAMP

GND

PREAMP

O/P

PREAMP

I/P

470

MIC

BIAS

3

2

13

1

12

7

11

8

9

PREAMP

DEC

A

6

O/P

GND

4

10

5

2.2K

14

CURRENT

TRIM

FEEDBACK

OUTPUT

STAGE

Document No. 500 - 58 - 6

High Power Class B Amplifier

LC552 DATA SHEET

DESCRIPTION

The LC552 is a versatile low voltage, high gain, high power

output amplifier.

It features a preamplifier module with adjustable gain and a

unique power amplifier module that can be operated either as

a high power, high efficiency class B amplifier, with very low

quiescent current consumption, or as a medium power

"vari-bias" class A amplifier.

While designed specifically for use in body type hearing aids,

the LC552 can be used in other applications where linear audio

frequency amplification and frequency shaping is required.

FEATURES

• operates over a supply range of 1.0 V to 3.0 V

• selectable class B or vari-bias class A operation

• feedback stabilized gain

• independent preamplifier and output modules

• minimum external parts count

BLOCK DIAGRAM

GENNUM CORPORATION P.O. Box 489, Stn A, Burlington, Ontario, Canada L7R 3Y3

tel. (905) 632-2996 fax: (905) 632-5846

Japan Branch: A-302 M i yamae Vi l l age, 2–10–42 M i yamae, Sugi nami–ku, Tokyo 168, Japan

tel. (03) 3334-7700

fax (03) 3247-8839

Revison Date: July 1993.

All resistors in ohms, all capacitors in farads unless otherwise stated.

STANDARD PACKAGING

• 14 pin DIP

• 14 pin SOIC

• Chip (50 x 52 mils)