Table of Contents
Mini D class power amplifier (TPA3110D2), Based on the TPA3110 digital audio power amplifier with preamplifier, it supports a power output of 30W. Some adjustments were made in the schematic design and the actual test results are good.
Schematic TPA3110 Mini D class power amplifier TPA3110D2 with preamplifier
About IC TPA3110 TPA3110d2
The IC TPA3110 TPA3110d2 is a highly efficient Class-D audio amplifier integrated circuit. It is designed to deliver high-quality audio performance in a compact and cost-effective package. The TPA3110d2 offers a wide operating voltage range, making it versatile and suitable for a variety of applications. Its advanced protection features, such as short-circuit and thermal protection, ensure the safety and longevity of the amplifier. With its low power consumption and minimal external components required, the IC TPA3110 TPA3110d2 is an ideal choice for powering audio systems in portable devices, home theater systems, and automotive applications.
Due desire to own a good-quality mini amplifier, and couldn’t find a suitable one after browsing on a certain online marketplace. Therefore, the author decided to design this portable mini audio amplifier module for yourself. It is based on the TPA3110D2 digital amplifier, with a driving power of 30W, which is sufficient for everyday use as a study or bedroom speaker driver.
The author made some adjustments to eliminate pop noise and background current noise, and added a power on/off mute circuit to the SD pin. During the sliding process of the adjustable potentiometer, there may be some high-frequency noise generated, so added two 10nF capacitors to ground for filtering (which proved to be effective).
It is recommended to use a power supply voltage of 15V-20V, which can effectively eliminate background current noise. The audio source input uses two 1uF Wima capacitors as the left and right channel inputs, and the front stage follows the output voltage to achieve isolation between the input and output.
BOM Mini D class power amplifier with preamplifier
| Value | Designator | Description | Quantity |
| Capacitors | |||
| 1uF | C1,C6,C11,C20,C21,C22,C23 | 0805 – SMD ceramic capacitor | 7 |
| 220nF | C2,C9,C10,C19 | C0805 – SMD ceramic capacitor | 4 |
| 680nF | C3,C7,C12,C14 | C0805 – SMD ceramic capacitor | 4 |
| 10nF | C4,C8,C13,C15,C17,C18 | C0805 – SMD ceramic capacitor | 6 |
| 0.1uF | C24,C25,C30,C31,C35,C36 | C0805 – SMD ceramic capacitor | 6 |
| 1nF | C32,C33 | C0805 – SMD ceramic capacitor | 2 |
| 1uF | C5,C16 | Film capacitor | 2 |
| 680uF | C26,C27 | Electrolytic capacitor | 2 |
| 47uF | C34 | Electrolytic capacitor | 1 |
| Resistors | |||
| 100k (104) | R1,R6,R16,R21,R23 | 0805 – SMD resistor | 5 |
| 20k (203) | R2,R15,R20 | 0805 – SMD resistor | 3 |
| 5.1k (512) | R3 | 0805 – SMD resistor | 1 |
| 10 (10R) | R4 | 0805 – SMD resistor | 1 |
| 10k (103) | R5,R10,R11,R18,R19,R22 | 0805 – SMD resistor | 6 |
| 1k (102) | R7 | 0805 – SMD resistor | 1 |
| 3.3R (3r3) | R8,R13,R14,R17 | 0805 – SMD resistor | 4 |
| 51k (513) | R9 | 0805 – SMD resistor | 1 |
| RK09712200MY | R12 | RK097 – 50K (503) Potentiometer | 1 |
| Semiconductors | |||
| SS34 | D1 | SMA -40V 3A Schottky Barrier Diodes (SBD) | 1 |
| LED0 | LED1 | LED 3mm red | 1 |
| S8050 | Q1 | SOT-23-3 – SMD NPN transistor | 1 |
| TPA3110D2PWP | TPA3110D2 | HTSSOP-28-EP Audio Power OpAmps | 1 |
| MC4558G | U1,U3 | SOIC-8 – Dual operational amplifier | 2 |
| CJ78L12_C8615 | U4 | SOT-89-3 – Voltage regulator 12V | 1 |
| Miscellaneous | |||
| 7101P1YAV2BE | SW1 | SPDT Straight Plugin Toggle Switches | 1 |
| DC-005-20A | DC1 | 2 mm 6.4 mm Plugin AC/DC Power Connectors | 1 |
| CD74R-33uH | L1,L2,L3,L4 | SMD inductor 7.8×7.2 mm | 4 |
| PJ-327ST-SMT | AUX | 3.5 mm headphone jack SMD Audio Connectors | 1 |
| CONN-TH_4P-P5.08_HT508R-5.08-4P | L+ | Terminal block 5.08 mm 4 pin | 1 |
Download files, links, and notes
Download PCB in Gerber, PDF, PNG, SVG
- Buy TPA3110 audio amplifier module
- PDF datasheet IC TPA3110D2 — 15-W Fil ter-Free Stereo Class-D Audio Power Amplifier With Speakerguard
- TPA3110D2EVM Audio Amplifier Evaluation Board (Rev. B)
- AN-1737 Managing EMI in Class D Audio Applications (Rev. A)
- Guidelines for Measuring Audio Power Amplifier Performance (Rev. A)
- Using Thermal Calculation Tools for Analog Components (Rev. A)
Source: https://oshwhub.com/m1138155/tda7264
Hi Toni, thanks for this great article! I’m just learning electronics and I’m wondering about the right channel output. I look at the schematic and datasheet and found that pin 18 is positive output for R channel, but in the PCB it end up as R-, while the pin 20 is negative R channel but it end up as R+.. is it ok that the output are wired reversed like this? Any particular reason why it reversed?