1Watt Audio Power Amplifier
LM4878 1 Watt Audio Power Amplifier in micro SMD package with Shutdown Logic Low
October 2002
LM4878 1 Watt Audio Powe...
Description
LM4878 1 Watt Audio Power Amplifier in micro SMD package with Shutdown Logic Low
October 2002
LM4878 1 Watt Audio Power Amplifier in micro SMD package with Shutdown Logic Low
General Description
The LM4878 is a bridge-connected audio power amplifier capable of delivering 1 W of continuous average power to an 8Ω load with less than .2% (THD) from a 5V power supply. Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external components. Since the LM4878 does not require output coupling capacitors or bootstrap capacitors. It is optimally suited for low-power portable applications. The LM4878 features an externally controlled, low-power consumption shutdown mode, as well as an internal thermal shutdown protection mechanism. The unity-gain stable LM4878 can be configured by external gain-setting resistors.
Key Specifications
j Power Output at 0.2% THD j Shutdown Current
1 W (typ) 0.01 µA (typ)
Features
n n n n n n Internal pulldown resistor on shutdown. micro SMD package (see App. note AN-1112) 5V - 2V operation No output coupling capacitors or bootstrap capacitors. Unity-gain stable External gain configuration capability
Applications
n Cellular Phones n Portable Computers n Low Voltage Audio Systems
Typical Application
10136001
FIGURE 1. Typical Audio Amplifier Application Circuit
Boomer ® is a registered trademark of National Semiconductor Corporation.
© 2002 National Semiconductor Corporation
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