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LM4863MT Datasheet

  • LM4863MT

  • Dual 2.2W Audio Amplifier Plus Stereo Headphone Function

  • 16頁(yè)

  • NSC

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LM4863 Dual 2.2W Audio Amplifier Plus Stereo Headphone Function
October 1999
LM4863
Dual 2.2W Audio Amplifier Plus Stereo Headphone
Function
General Description
The LM4863 is a dual bridge-connected audio power ampli-
fier which, when connected to a 5V supply, will deliver 2.2W
to a 4鈩?load (Note 1) or 2.5W to a 3鈩?load (Note 2)with less
than 1.0% THD+N. In addition, the headphone input pin al-
lows the amplifiers to operate in single-ended mode to drive
stereo headphones.
Boomer audio power amplifiers were designed specifically to
provide high quality output power from a surface mount
package while requiring few external components. To sim-
plify audio system design, the LM4863 combines dual bridge
speaker amplifiers and stereo headphone amplifiers on one
chip.
The LM4863 features an externally controlled, low-power
consumption shutdown mode, a stereo headphone amplifier
mode, and thermal shutdown protection. It also utilizes cir-
cuitry to reduce 鈥渃licks and pops鈥?during device turn-on.
Note 1:
An LM4863MTE which has been properly mounted to the circuit
board will deliver 2.2W into 4鈩? The other package options for the LM4863
will deliver 1.1W into 8鈩? See the Application Information section for
LM4863MTE usage information.
Note 2:
An LM4863MTE which has been properly mounted to the circuit
board and forced-air cooled will deliver 2.5W into 3鈩?
Key Specifications
n
P
O
at 1% THD+N
into 3鈩?(LM4863MTE)
into 4鈩?(LM4863MTE)
into 8鈩?(LM4863)
n
Single-ended mode - THD+N
at 75mW into 32鈩?/div>
n
Shutdown current
2.5W(typ)
2.2W(typ)
1.1W(typ)
0.5%(max)
0.7碌A(chǔ)(typ)
Features
n
n
n
n
n
Stereo headphone amplifier mode
鈥淐lick and pop鈥?suppression circuitry
Unity-gain stable
Thermal shutdown protection circuitry
Exposed-DAP TSSOP, TSSOP, SOIC and DIP
packaging available
Applications
n
Multimedia monitors
n
Portable and desktop computers
n
Portable televisions
Typical Application
DS012881-1
*
Refer to the section Proper Selection of External Components, for a detailed discussion of C
B
size.
FIGURE 1. Typical Audio Amplifier Application Circuit
Boomer
廬
is a registered trademark of National Semiconductor Corporation.
漏 1999 National Semiconductor Corporation
DS012881
www.national.com

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