NNSS44114499 is a 3W single-channel digital audio amplifier with ultra-low EMI and no need for filters. It uses advanced technology to greatly reduce EMI interference across the entire bandwidth, minimizing its impact on other components. The output of NNSS44114499, with its PWM modulation structure and built-in feedback resistor, eliminates the need for external components, PCB area, and system cost. It can provide 3W output power to a 4Ω load with a working voltage of 5V. It also features overcurrent protection, overheating protection, undervoltage protection, high efficiency, and high PSRR.
This manual describes the NS4149, a 3 W single‑channel digital audio power amplifier with ultra‑low EMI and no external filter required. It covers functional description, key features, application areas, typical circuit examples, maximum ratings, electrical characteristics, pin assignments, and detailed application notes.
The document also explains gain setting, input and bypass capacitor selection, power‑down noise suppression, efficiency optimization, protection mechanisms, and EMI‑enhancement techniques, helping designers integrate the chip into mobile phones, music phones, PDAs, MP3/MP4 players, and other portable audio devices. This manual is written in Chinese.
| Output Power | 3.0 W (4 Ω load), 1.8 W (8 Ω load) |
|---|---|
| Supply Voltage Range | 2.5 V – 5.5 V |
| THD+N | 0.1 % (1 W, 5 V, 4 Ω) |
| Efficiency | up to 90 % |
| Protection Features | Over‑current, over‑temperature, undervoltage protection |
| Package | MSOP‑8 |
| Operating Temperature Range | -40 °C to 85 °C |
| Recommended Supply Voltage | 2.2 V – 5.25 V |
| Input Voltage Range | -0.3 V to VDD |
The NS4149 can deliver 3 W into a 4 Ω load and 1.8 W into an 8 Ω load.