The 6805 is a 5 W mono digital audio power‑amp IC with distortion‑protection, ultra‑low EMI and up to 90 % efficiency.
The 6805 is a 5 W single‑channel digital audio power‑amplifier IC that integrates a feedback resistor and optional input resistor, allowing gain to be set externally. It features a unique distortion‑protection mode that dynamically adjusts gain to prevent speaker damage, ultra‑low EMI across the full bandwidth, and a PWM output that requires no external filter. The chip operates from 2.5 V to 5.5 V and delivers up to 5 W into a 2 Ω load at a 5 V supply, with efficiency exceeding 90 %.
The device is supplied in an SOP‑8 package and includes built‑in over‑current, over‑heat, and undervoltage protection. It can be switched between normal and distortion‑protection modes via the CTRL pin either by a hardware voltage level or a one‑line pulse (software). Typical applications include USB 2.1 audio, 2.1‑channel speaker modules, and other portable audio systems. This manual is written in Chinese.
| Output Power (2 Ω load) | 5 W at 5 V |
|---|---|
| Output Power (other loads) | 3.0 W (4 Ω), 3.8 W (3 Ω), 5.0 W (2 Ω) |
| Operating Voltage Range | 2.5 V – 5.5 V |
| Efficiency | up to 90 % |
| THD+N | 0.1 % (2 W, 5 V, 2 Ω) |
| Protection Features | Over‑current, over‑heat, undervoltage shutdown |
| Package | SOP‑8 |
| Operating Temperature Range | -40 °C – 85 °C |
| CMRR | -70 dB |
| Supply Current (No Load, 5 V) | 4 mA |
The 6805 can deliver up to 5 W into a 2 Ω load when powered at 5 V.
The chip includes over‑current, over‑heat and undervoltage protection that shut down the device when a fault is detected and automatically restart when the condition clears.