High Power Class B Amplifier
LC552 DATA SHEET
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
≤
80 dB
•
high power output > 140 dB
SPL
•
independent preamplifier and output modules
•
minimum external parts count
STANDARD PACKAGING
• 14 pin DIP
• 14 pin SOIC
• Chip (50 x 52 mils)
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.
FEEDBACK
9
V
CC 1
10
MIC
BIAS
5
V
CC 2
11
CURRENT
TRIM
14
2.2K
470
12
OUTPUT B
PREAMP
I/P
6
PREAMP
OUTPUT
STAGE
3
OUTPUT A
7
PREAMP
GND
8
PREAMP
O/P
1
OUTPUT
STAGE
I/P
2
13
4
DEC DEC O/P
A
B GND
All resistors in ohms, all capacitors in farads unless otherwise stated.
BLOCK DIAGRAM
Revison Date: July 1993.
Document No. 500 - 58 - 6
GENNUM CORPORATION P.O. Box 489, Stn A, Burlington, Ontario, Canada L7R 3Y3
Japan Branch: A-302 M i yamae Vi l l age, 2–10–42 M i yamae, Sugi nami–ku, Tokyo 168, Japan
tel. (905) 632-2996 fax: (905) 632-5846
tel. (03) 3334-7700
fax (03) 3247-8839
GENNUM [ GENNUM CORPORATION ]
