10W Class-D Stereo Audio Amplifier with Mute, Shutdown and Four Gain Settings

  • Rajkumar Sharma
  • 48 Views
  • moderate
  • Tested

This is a Class-D Stereo audio amplifier project that provides 10W stereo output. The amplifier includes Gain control using 2 x Jumpers, Mute function, and shutdown function.

RCA female connectors are provided for the audio source input, screw terminals are provided for an easy interface with speakers and power supply input. The project was built using a TPA3125D2 chip from TI.

The TPA3125D2 is a 10-W (per channel), efficient, Class-D audio power amplifier for driving stereo speakers in a single-ended configuration; or, a mono speaker in a bridge-tied-load configuration. The TPA3125D2 can drive stereo speakers as low as 4 Ω. The efficiency of the TPA3125D2 eliminates the need for an external heat sink when playing music. The gain of the amplifier is controlled by two gain select pins. The gain selections are 20, 26, 32, and 36 dB. The patented start-up and shutdown sequences minimize pop noise in the speakers without additional circuitry.

Gain Setting Jumper J3 & J4 (J3=Gain1 & J4=Gain0) OFF Denotes Jumper Removed/Open, On Denotes Jumper Closed/Installed

  • Gain-1 ON + Gain-0 ON = Amplifier Gain (dB) 20
  • Gain-1 ON + Gain-0 OFF = Amplifier Gain (dB) 26
  • Gain-1 OFF + Gain-0 ON = Amplifier Gain (dB) 32
  • Gain-1 OFF + Gain-0 OFF = Amplifier Gain (dB) 20

Input Resistance

Changing the gain setting can vary the input resistance of the amplifier from its smallest value, 9Kohms +/-20%, to the largest value, 60Kohms +/-20%.

Mute and Shutdown Function (Jumper J1-Mute & J2-Shutdown)

  • Jumper J1 Open Normal Operation, J1 Closed Mute On
  • Jumper J2 Open Normal Operation, J2 Closed Shutdown On

Features

  • Power Supply 12V DC (Range 10V to 26V DC)
  • Supply Current 3A
  • Output 10W (24V DC Supply)
  • Speaker 8 Ohms (Minimum Speaker Load 4 Ohms)
  • 2 x Single Ended Audio Signal Input
  • Jumper J1 Mute Function
  • Jumper J2 Shutdown Function
  • Four Selectable Gain Settings (Jumper J3 and J4)
  • Thermal and Short Circuit Protection with Auto Recovery
  • PCB Dimensions 52.71 x 63.82 mm

Schematic

Parts List

NOQNTYREFDESCMANUFACTURERSUPPLIERPART NO
11CN12 PIN SCREW TERMINAL PITCH 5.08MMPHOENIXDIGIKEY277-1247-ND
21CN2RCA FEMALE CUI DEVICESDIGIKEYCP-1405-ND
31CN32 PIN SCREW TERMINAL PITCH 5.08MMPHOENIXDIGIKEY277-1247-ND
41CN4RCA FEMALE CUI DEVICESDIGIKEYCP-1405-ND
51CN52 PIN SCREW TERMINAL PITCH 5.08MMPHOENIXDIGIKEY277-1247-ND
67C1,C2,C9,C10,1uF/50V SMD SIZE 0805MURATA/YAGEODIGIKEY
C12,C16,C191uF/50V SMD SIZE 0805MURATA/YAGEODIGIKEY
74C3,C4,C6,C17470uF/35VNICHICOMDIGIKEY493-12005-1-ND
83C5,C13,C201KPF/50V SMD SIZE 0805MURATA/YAGEODIGIKEY
92C7,C150.22uF/25V SMD SIZE 0805MURATA/YAGEODIGIKEY
102C8,C180.22uF/63V BOXEPCOS-TDKDIGIKEY495-2492-ND
111C111.5KPF/50V SMD SIZE 0805MURATA/YAGEODIGIKEY
121C1410uF/50V SMD SIZE 0805MURATA/YAGEODIGIKEY
131C211K5PF/50V SMD SIZE 0805MURATA/YAGEODIGIKEY
141D1LED SMD SIZE 0805LITE ON INCDIGIKEY160-1427-1-ND
154J1,J2,J3,J42 PIN HEADER PITCH 2.54MMWURTHDIGIKEY732-5315-ND
164L1,L2,L4,L6FERRITE BEAD 80OHMS/100MHZ SIZE 0805TDKDIGIKEY445-2187-1-ND
172L3,L533uH /2AMPCOIL CRAFTCOILCRAFTDO3316P-333MLD
184R1,R3,R6,R710K 5% SMD SIZE 0805MURATA/YAGEODIGIKEY
193R2,R5,R91K 5% SMD SIZE 0805MURATA/YAGEODIGIKEY
202R4,R810E 5% SMD SIZE 1206MURATA/YAGEODIGIKEY
211U1TPA3125D2TIDIGIKEY296-24090-5-ND
224SHUNTSHUNT FOR JUMPERSSULINS INCDIGIKEYS9001-ND

Connections

Gerber View

Photos

Video

TPA3125D2N Datasheet

tpa3125d2

PCB

Subscribe
Notify of
guest
0 Comments
Inline Feedbacks
View all comments

RELATED PROJECTS

X