The LM4755 is a stereo audio amplifier from National Semiconductor that can output 11W per channel at 4Ω and 7W per channel at 8Ω using a single 24V supply.
The LM4755 is a stereo audio amplifier capable of delivering up to 11 W per channel into an 8 Ω load at 24 V supply with 10 % THD+N. It features a single‑supply design, internal mute function, minimal external components, and a wide supply range of 9 V to 40 V, making it suitable for compact stereo, TV, and consumer electronics applications.
The document lists electrical characteristics such as closed‑loop gain (34 dB), input impedance (83 kΩ), slew rate (2 V/µs), and power bandwidth (65 kHz at 2.5 W into 80 Ω). It also includes absolute maximum ratings, typical application circuits, pin configurations, and thermal information for designers.
| Closed‑loop Gain | 34 dB |
|---|---|
| Supply Voltage Range | 9 V – 40 V |
| Power Dissipation | 62.5 W @ 25 °C, 22 °C/W |
| Quiescent Current (Mute On) | 7 mA |
| Input Impedance | 83 kΩ |
| Slew Rate | 2 V/µs |
| Power Bandwidth | 65 kHz (3 dB BW at 2.5 W, 80 Ω) |
The device has a closed‑loop gain of 34 dB.
It operates from 9 V up to 40 V.
The input impedance is 83 kΩ.