LM4680 Datasheet, PDF (1/11 Pages) National Semiconductor (TI) – 10W High-Efficiency Mono BTL Audio Power Amplifier

January 2005
LM4680
10W High-Efficiency Mono BTL Audio Power Amplifier
General Description
The LM4680 is a high efficiency switching audio power
amplifier primarily designed for demanding applications in
flat panel monitors and TV’s. It is capable of delivering 10W
to an 8Ω mono BTL load with less than 10% distortion
(THD+N) when powered from a 14V_DC power supply.
Boomer audio power amplifiers were designed specifically to
provide high quality output power with a minimal amount of
external components. The LM4680 features a micro-power,
active-low shutdown mode, an internal thermal shutdown
protection mechanism, output fault detect, and short circuit
protection.
The LM4680 contains advanced transient (“pop and click”)
suppression circuitry that eliminates noises that would oth-
erwise occur during turn-on and turn-off transitions.
Key Specifications
j Power Output BTL (V_DD = 14V,
f_IN = 1kHz, THD+N = 10%,
R_L = 8Ω)
j Quiescent Power Supply Current
j Efficiency (V_DD = 12V, f_IN = 1kHz,
R_L = 8Ω, P_OUT = 6W)
j Shutdown Current
j Fixed Gain
10W (typ)
25mA (typ)
81% (typ)
0.1mA (typ)
30dB (typ)
Features
n Soft-start circuitry eliminates noise during turn-on
transition
n Low current shutdown mode
n Low quiescent current
n 6W BTL output, R_L = 8Ω, THD+N = 1%
n Short circuit protection
n Fixed, internally set gain of 30dB
n Internal clamp diodes protect amplifier outputs
Applications
n Flat Panel Monitors
n Flat Panel TVs
n Computer Sound Cards
Connection Diagram
Plastic Package
20095802
Top View
Order Number LM4680SD
See NS Package Number SRC14A
Boomer^® is a registered trademark of National Semiconductor Corporation.
© 2005 National Semiconductor Corporation DS200958
www.national.com