NSC LM2879T Datasheet

LM2879 Dual 8W Audio Amplifier

February 1995

General Description

Y

The LM2879 is a monolithic dual power amplifier which offers high quality performance for stereo phonographs, tape players, recorders, AM-FM stereo receivers, etc.

The LM2879 will deliver 8W/channel to an 8X load. The

Self-centering biasing

Y

4MXinput impedance

Y

Internal current limiting

Y

Internal thermal protection amplifier is designed to operate with a minimum of external components and contains an internal bias regulator to bias each amplifier. Device overload protection consists of both internal current limit and thermal shutdown.

Features

Y

AVOtypical 90 dB

Y

9W per channel (typical)

Y

60 dB ripple rejection

Y

70 dB channel separation

Applications

Y

Multi-channel audio systems

Y

Tape recorders and players

Y

Movie projectors

Y

Automotive systems

Y

Stereo phonographs

Y

Bridge output stages

Y

AM-FM radio receivers

Y

Intercoms

Y

Servo amplifiers

Y

Instrument systems

Connection Diagram and Typical Application

Plastic Package

Stereo Amplifier

TL/H/5291– 1

Order Number LM2879T

See NS Package Number TA11B

*TAB must be connected to GND.

TL/H/5291– 2

FIGURE 1

C

1995 National Semiconductor Corporation RRD-B30M115/Printed in U. S. A.

TL/H/5291

Absolute Maximum Ratings

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

Supply Voltage 35V Input Voltage (Note 1) Operating Temperature (Note 2) 0

Electrical Characteristics V

Ctoa70§C

§

e

28V, T

S

g

0.7V

TAB

Storage Temperature Junction Temperature 150 Lead Temp. (Soldering, 10 seconds) 260 ESD rating to be determined. 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 12 65 mA

O

Operating Supply Voltage 6 32 V

Output Power/Channel fe1 kHz, THDe10%, T

Distortion fe1 kHz, R

Output Swing R

Channel Separation C

PSRR Positive Supply C

P

O

L

BYPASS

e

f V

O

BYPASS

e

f V

ripple

e

8X

L

e

1 W/Channel

e

8X V

e

50 mF, C

1 kHz, Output Referred

e

4 Vrms

e

50 mF, C

120 Hz, Output Referred

e

1 Vrms

PSRR Negative Supply Measured at DC, Input Referred

Common-Mode Range Split Suppliesg15V, Pin 1

Tied to Pin 11

e

25§C6 8 W

TAB

0.05 1 %

b

6V Vp-p

e

0.1 mF

IN

e

0.1 mF

IN

b

50

b

50

S

b

70 dB

b

60 dB

b

60 dB

g

13.5 V

Input Offset Voltage 10 mV

Noise Equivalent Input Noise

Open Loop Gain R

e

0, C

R

S

BW CCIR

Output Noise Wideband 0.8 mV

e

R

S

e

S

0.1 mF

IN

e20b

20 kHz 2.5 mV

ARM 3.0 mV

#

e

0, C

0.1 mF, A

IN

51X,fe1 kHz, R

e

200

V

e

8X 70 dB

L

Input Bias Current 100 nA

Input Impedance Open Loop 4 MX

DC Output Voltage V

e

28V 14 V

S

Slew Rate 2V/ms

Power Bandwidth 3 dB Bandwidth at 2.5W 65 kHz

Current Limit 1.5 A

Note 1: The input voltage range is normally limited tog0.7V with respect to pin 1. This range may be extended by shorting pin 1 to the positive supply.

Note 2: For operation at ambient temperature greater than 25

resistance, junction to case, is 3

C/W. Thermal resistance, case to ambient, is 40§C/W.

§

C, the LM2879 must be derated based on a maximum 150§C junction temperature. Thermal

§

b

65§Ctoa150§C

43§C/W

1§C/W

C

§

C

§

Typical Performance Characteristics

Device Dissipation vs Ambient Temperature

Open Loop Gain vs Frequency

Power Dissipation vs Power Output

TL/H/5291– 3

2

Typical Performance Characteristics (Continued)

Supply Current vs Output Power

Supply Rejection vs Frequency

Channel Separation (Referred to the Output) Frequency

Total Harmonic Distortion vs Frequency

Total Harmonic Distortion vs Power Output

Total Harmonic Distortion vs Frequency Output Swing vs V

Power Output/Channel vs Supply Voltage

S

TL/H/5291– 4

3