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Content：

20W power amplifier with MP3 modules, MP3 USB FM modulator

Output Power: Maximum 22.5W at RL=4Ω , VCC=14V
Power efficiency is up to 93%
Low Working Voltage Down To 4V, High Working Voltage up To 14V
Thermal Protection function
Output Pin Short-Circuit Protection
Separate VCC & PVCC
Class-D stereo audio design
Components use SMT decal, the board dimension is very small
IC decal is QFN44
No external heat-sink, Less heat, save heat sink cost
The current is very small
The PCB design provides both bead and LC solutions
The dimension is only 42mm× 48mm
Support SD/MMC card reader MP3 player
USB port: USB2.0
Disk read speed: 970k bytes/sec
Music format: Support all of MP3 format
Key function: SD/U change, NEXT, PREV, VOL-, VOL+
Support memory play, repeat play, EQ function
Support auto play when put into SD card or U disk
Support digital disply, support FM