90074 Datasheet, PDF (1/16 Pages) Texas Instruments – Audio Power Amplifier Series Stereo High Fidelity 200 Volt Driver with Mute

September 2006
LM4702 Audio Power Amplifier Series
Stereo High Fidelity 200 Volt Driver with Mute
General Description
The LM4702 is a high fidelity audio power amplifier driver
designed for demanding consumer and pro-audio applica-
tions. Amplifier output power may be scaled by changing the
supply voltage and number of output devices. The LM4702
is capable of delivering in excess of 300 watts per channel
single ended into an 8 ohm load in the presence of 10% high
line headroom and 20% supply regulation.
The LM4702 includes thermal shut down circuitry that acti-
vates when the die temperature exceeds 150˚C. The
LM4702’s mute function, when activated, mutes the input
drive signal and forces the amplifier output to a quiescent
state.
The LM4702 is available in 3 grades that span a wide range
of applications and performance levels. The LM4702C is
targeted at high volume applications. The LM4702B includes
a higher voltage rating along with the tighter specifications.
The LM4702A* (in development) is the premium part with the
highest voltage rating, fully specified with limits over voltage
and temperature, and is offered in a military 883 compliant
TO-3 package.
* Tentative Max Operating voltage for the LM4702A (in de-
velopment)
Key Specifications
j Wide operating voltage range
LM4702A* (in development)
LM4702B
LM4702C
j Equivalent Noise
j PSRR
j THD+N (A and B Grades)
Features
n Very high voltage operation
n Scalable output power
n Minimum external components
n External compensation
n Thermal Shutdown and Mute
Applications
n AV receivers
n Audiophile power amps
n Pro Audio
n High voltage industrial applications
±20V to ±100V
±20V to ±100V
±20V to ±75V
3µV
110dB (typ)
0.0003%
Typical Application and Connection Diagrams
20158302
Plastic Package — 15 Lead TO-220
(for LM4702BTA, LM4702CTA)
20158319
FIGURE 1. Typical Audio Amplifier Application Circuit
Overture^® is a registered trademark of National Semiconductor Corporation.
© 2006 National Semiconductor Corporation DS201583
20158320
Metal Can — 15 Lead TO-3
(for LM4702A, in development)
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