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LM4940 Datasheet

  • LM4940

  • 6W Streo Audio Power Amplifier

  • 14頁

  • NSC

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LM4940 6W Stereo Audio Power Amplifier
April 2005
LM4940
6W Stereo Audio Power Amplifier
General Description
The LM4940 is a dual audio power amplifier primarily de-
signed for demanding applications in flat panel monitors and
TV鈥檚. It is capable of delivering 6 watts per channel to a 4鈩?/div>
load with less than 10% THD+N while operating on a
14.4V
DC
power supply.
Boomer audio power amplifiers were designed specifically to
provide high quality output power with a minimal amount of
external components. The LM4940 does not require boot-
strap capacitors or snubber circuits. Therefore, it is ideally
suited for display applications requiring high power and mini-
mal size.
The LM4940 features a low-power consumption active-low
shutdown mode. Additionally, the LM4940 features an inter-
nal thermal shutdown protection mechanism along with short
circuit protection.
The LM4940 contains advanced pop & click circuitry that
eliminates noises which would otherwise occur during
turn-on and turn-off transitions.
The LM4940 is a unity-gain stable and can be configured by
external gain-setting resistors.
Key Specifications
j
Quiscent Power Supply Current
j
P
OUT
(SE)
40mA (max)
6W (typ)
40碌A(chǔ) (typ)
V
DD
= 14.4V, R
L
= 4鈩? 10% THD+N
j
Shutdown current
Features
n
Pop & click circuitry eliminates noise during turn-on and
turn-off transitions
n
Low current, active-low shutdown mode
n
Low quiescent current
n
Stereo 6W output, R
L
= 4鈩?/div>
n
Short circuit protection
n
Unity-gain stable
n
External gain configuration capability
Applications
n
Flat Panel Monitors
n
Flat Panel TV鈥檚
n
Computer Sound Cards
Typical Application
20075672
FIGURE 1. Typical Stereo Audio Amplifier Application Circuit
Boomer
廬
is a registered trademark of National Semiconductor Corporation.
漏 2005 National Semiconductor Corporation
DS200756
www.national.com

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