NSC LM2877P Datasheet

LM2877 Dual 4W Audio Power Amplifier

LM2877 Dual 4W Audio Power Amplifier

February 1995

General Description

The LM2877 is a monolithic dual power amplifier designed
to deliver 4W/channel continuous into 8X loads. The
LM2877 is designed to operate with a low number of exter­nal components, and still provide flexibility for use in stereo
phonographs, tape recorders and AM-FM stereo receivers,
etc. Each power amplifier is biased from a common internal
regulator to provide high power supply rejection and output
Q point centering. The LM2877 is internally compensated
for all gains greater than 10, and comes in an 11-lead sin­gle-in-line package.

Features

Y

4W/channel

Y

b

68 dB ripple rejection, output referred

Y

b

70 dB channel separation, output referred

Connection Diagram

(Single-In-Line Package)

Y

Wide supply range, 6-24V

Y

Very low cross-over distortion

Y

Low audio band noise

Y

AC short circuit protected

Y

Internal thermal shutdown

Applications

Y

Multi-channel audio systems

Y

Stereo phonographs

Y

Tape recorders and players

Y

AM-FM radio receivers

Y

Servo amplifiers

Y

Intercom systems

Y

Automotive products

Top View

TL/H/7933– 1

Order Number LM2877P

See NS Package Number P11A

*Pin 6 must be connected to GND.

C

1995 National Semiconductor Corporation RRD-B30M75/Printed in U. S. A.

TL/H/7933

Absolute Maximum Ratings

If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.

Supply Voltage 26V

Ctoa70§C

§

e

20V, T

S

g

0.7V

TAB

Input Voltage

Operating Temperature 0

Electrical Characteristics V

Storage Temperature

Junction Temperature 150§C

Lead Temperature (Soldering, 10 sec.) 260§C

Thermal Resistance

i

JC

i

JA

e

25§C, R

e

L

8X,A

e

50 (34 dB) unless otherwise specified.

V

Parameter Conditions Min Typ Max Units

Total Supply Current P

e

0W 25 50 mA

O

Operating Supply Voltage 6 24 V

Output Power/Channel fe1 kHz, THDe10%, T

e

V

20V 4.0 4.5 W

S

e

V

18V 3.6 W

S

e

V

S

e

V

S

Distortion, THD fe1 kHz, V

e

P

O

e

P

O

e

P

O

e

f

1 kHz, V

e

P

O

e

P

O

e

P

O

Output Swing R

Channel Separation C

PSRR Power Supply C

e

L

e

F

Output Referred

e

V

S

e

V

S

e

F

e

12V, R
12V, R

50 mW/Channel 0.1 %

4X 1.5 1.9 W

L

e

8X 1.0 W

L

e

20V

S

1W/Channel 0.07 1 %
2W/Channel 0.07 %

e

12V, R

S

50 mW/Channel 0.25 %
500 mW/Channel 0.20 %
1W/Channel 0.15 1 %

8X V

O

O

IN

e

e

0.5 Vrms

IN

e

4 Vrms

e

0.1 mF, fe1 kHz,

0.1 mF, fe120 Hz

50 mF, C

20V, V
7V, V

50 mF, C

e

25§C

TAB

e

4X

L

S

b

50

b
b

Rejection Ratio Output Referred

e

V

20V, V

S

e

V

7V, V

S

RIPPLE

RIPPLE

e

e

0.5 Vrms

1 Vrms

b

50

b
b

Noise Equivalent Input Noise

e

0, C

IN

e

0, C

IN

e

0, fe1 kHz, R

e

0.1 mF, BWe20 Hz–20 kHz 2.5 mV

e

0.1 mF, A

e

200 0.80 mV

V

e

8X 70 dB

L

Open Loop Gain R

R

S

Output Noise Wideband
R

S

S

Input Offset Voltage 15 mV

Input Bias Current 50 nA

Input Impedance Open Loop 4 MX

DC Output Level V

e

20V 9 10 11 V

S

Slew Rate 2.0 V/ms

Power Bandwidth 65 kHz

Current Limit 1.0 A

Note 1: For operation at ambient temperature greater than 25§C, the LM2877 must be derated based on a maximum 150§C junction temperature using a thermal
resistance which depends upon device mounting techniques.

b

65§Ctoa150§C

10§C/W
55§C/W

b

4V

p-p

70 dB
60 dB

68 dB
40 dB

2

Equivalent Schematic Diagram

TL/H/7933– 2

3