LM4940_14 Datasheet, PDF (1/23 Pages) Texas Instruments – 6W Stereo Audio Power Amplifier

LM4940
www.ti.com
SNAS219B – MAY 2004 – REVISED MARCH 2011
LM4940
6W Stereo Audio Power Amplifier
Check for Samples: LM4940
FEATURES
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•23 Click and Pop Circuitry Eliminates Noise
During Turn-On and Turn-Off Transitions
• Low Current, Active-Low Shutdown Mode
• Low Quiescent Current
• Stereo 6W Output, R_L = 4Ω
• Short Circuit Protection
• Unity-Gain Stable
• External Gain Configuration Capability
APPLICATIONS
• Flat Panel Monitors
• Flat Panel TVs
• Computer Sound Cards
KEY SPECIFICATIONS
• Quiscent Power Supply Current: 40mA (max)
(SE)
• P_OUT
V_DD = 14.4V, R_L = 4Ω, 10% THD+N: 6 W (typ)
• Shutdown Current: 40µA (typ)
DESCRIPTION
The LM4940 is a dual audio power amplifier primarily
designed for demanding applications in flat panel
monitors and TVs. It is capable of delivering 6 watts
per channel to a 4Ω 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 bootstrap capacitors or
snubber circuits. Therefore, it is ideally suited for
display applications requiring high power and minimal
size.
The LM4940 features a low-power consumption
active-low shutdown mode. Additionally, the LM4940
features an internal thermal shutdown protection
mechanism along with short circuit protection.
The LM4940 contains advanced pop and 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.
TYPICAL APPLICATION
Figure 1. Typical Stereo Audio Amplifier Application Circuit
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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Boomer is a trademark of Texas Instruments, Inc.
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All other trademarks are the property of their respective owners.
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PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2004–2011, Texas Instruments Incorporated