LM4680 Datasheet | National Semiconductor

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 14VDC power supply. Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external ponents. 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 otherwise occur during turn-on and turn-off transitions. Key Specifications j Power Output BTL (VDD = 14V, f IN = 1k Hz, THD+N = 10%, RL = 8Ω) j Quiescent Power Supply Current j Efficiency (VDD = 12V, f IN = 1k Hz, 10W (typ) 25m A (typ) 81% (typ) 0.1m A (typ) 30d B (typ) RL = 8Ω, POUT = 6W) j Shutdown Current j Fixed Gain Features n Soft-start circuitry eliminates noise during turn-on transition n Low current shutdown mode n Low quiescent current n 6W BTL output, RL = 8Ω, THD+N = 1% n Short circuit protection n Fixed, internally set gain of 30d B n Internal clamp diodes protect amplifier outputs Applications n Flat Panel Monitors n Flat Panel TVs n puter Sound Cards Connection Diagram Plastic Package Top View Order Number LM4680SD See NS Package Number SRC14A Boomer ® is a registered trademark of National Semiconductor Corporation. © 2005 National Semiconductor Corporation DS200958 .national. Typical Application FIGURE 1. Typical Audio Amplifier Application Circuit LM4680SD Demo Board Bill of Material Item 1 2 3 4 5 6 7 8 Part Description LM4680SD Audio Amplifier Cer Cap 0.1µF 16V 10% Cer Cap 0.27µF 16V 10% Cer Cap 1.0µF 25V 10% Tant Cap 1.0µF 16V 10% Tant Cap 10.0µF 16V 10% Tant Cap 10.0µF 16V 10% Inductor 4922 Series 27µH SMT Package Size...