LC549 Datasheet, PDF (1/5 Pages) List of Unclassifed Manufacturers – High Power Class B Output Stage

High Power Class B
Output Stage
LC549/LV549/LD549 DATA SHEET
FEATURES
DESCRIPTION
• 40dB of electrical gain
• 1.0 to 1.6 VDC supply operating range
• current trim capability (R_T)
• high efficiency class B output stage
• may be used with a linear or compression preamplfier
STANDARD PACKAGING
• 8 pin MICROpac (LC549)
• 8 pin MINIpac
• 8 pin PLID^® (LC549, LD549)
• Chip (47 x 40 mils) (LC549, LD549)
The LC/LV/LD549 is an 8 pin, low voltage, push-pull audio
frequency output stage amplifier with a single unbalanced
input. The circuit utilizes two internal negative feedback
loops to stabilize the DC operating point for temperature
stability and to linearize the transfer function over a wide
dynamic range. The circuit operates near ideal class B
conditions resulting in low distortion and very low quiescent
current, required for extended battery life.
The LC549, LV549 and LD549 differ in only one respect;
the LV549 and LD549 are selected devices which are
capable of delivering from 10 mA to 41 mA and from 36 mA
to 75 mA of output current respectively. These values are
the maximum current drawn with both output stage transistors
in saturation. Thus the LD549 is capable of producing a
high output in a low impedance load, the LV549 is selected
to have lower peak currents, extending the life of the
battery.
R_T V_B
36
5
OUTPUT 1
2
INPUT
8
OUTPUT 2
41
DEC 1 DEC 2
7
GND
U.S. Patent No. 4,085,382
Patented in other countries
BLOCK DIAGRAM
Revision Date: January 2001
Document No. 500 - 25 - 09
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