The LM4940 is a 6W stereo 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 14.4VDC 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.
The LM4940 is a dual 6 W stereo audio power amplifier designed for flat‑panel monitors and TVs. It operates from a 14.4 V supply, delivers up to 6 W per channel into a 4 Ω load, and includes pop‑and‑click circuitry to eliminate turn‑on/off noise.
The device features low‑quiescent current, an active‑low shutdown mode, internal thermal shutdown, and short‑circuit protection. Typical application circuits, absolute maximum ratings, electrical characteristics, and extensive performance graphs are provided to aid designers in implementing the amplifier in audio systems.
| Quiescent Power Supply Current | 40 mA (max) |
|---|---|
| Shutdown Current | 40 µA (typ) |
| Supply Voltage (Vpp) | 14.4 V |
| Output Power | 6 W per channel (typ) |
| THD+N | ≤10 % at 6 W |
| Shutdown Voltage Input High | 2.0 V (min) |
| Shutdown Voltage Input Low | 0.4 V (max) |
| Operating Temperature Range | -65 °C to +150 °C |
The LM4940 draws up to 40 mA of quiescent current from the supply.
No, the LM4940 does not require boot‑strap capacitors or snubber circuits.
The typical supply voltage (Vpp) is 14.4 V.