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TPA3001D1 Power Amplifier

Recently we looked for a replacement class-D power amplifier to replace my old TDA2030 power amplifier build. While searching for a suitable power amplifier IC, we found TPA3001D1 from the local market. This IC is a slightly older 20W Class-D power amplifier manufactured by Texas Instruments. At the time of this writing, it is priced at LKR 180 (0.89 USD) in the local market and is still available at all major electronics stores (including online stores).

Prototype version of TPA3001D1 power amplifier.

To minimize assembling difficulties, we used through-hole-type components in this PCB. The only SMD component in this PCB is the TPA3001D1 IC. We installed the power amplifier IC on the bottom of the PCB because then it would receive good airflow.

The table below lists all the components required for this project.

Designator Quantity Value
C1, C8, C13, C14, C15, C16  6  1µF/25V
C17  1  10µF/25V
C2, C3, C6  3  0.47µF
C4, C5  2  0.22µF
C7  1  220pF
C9, C10  2  0.1µF
C11, C12  2  0.001µF
D1, D2  2  SR110 or 1N5822
FB1, FB2  2  4.7mm axial ferrite bead
J1, J2, J3  3  3.5mm, 2-pin screw terminal
JP1, JP2, JP3  3  2.54mm 2-pin header
L1, L2  2  33µH drum inductor
R1, R2  2  51Ω
R3, R4, R5, R6  4  120KΩ
U1  1  TPA3001D1

For D1 and D2, use SR110 or any equivalent Schottky diode. Both L1 and L2 are 33µH drum core inductors. The inductors made for this specification are available for purchase at electronics stores.

The dimension of the PCB is 45.71mm × 67.59mm and designed on a double-sided board. To build this PCB, we recommended the Seeed Fusion PCB fabrication service. 

After assembly, we test this amplifier using a 12V power supply. As we have observed, this amplifier starts working from 7V without any distortion. We operated this amplifier at 75% volume continuously for one hour, where we did not notice any significant temperature change in the IC. 

This given design has three jumpers to adjust some parameters of the power amplifier. The JP2 and JP3 jumpers can use to regulate the amplifier gain between 12dB to 36dB. To get the maximum of 36dB gain, open both jumpers. The below table has all the gain configurations of this amplifier.

JP3 JP2 Gain
Open
 Open  36dB
Open
 Close  23.6dB
Close
 Open  18dB
Close
 Close  12dB

The JP1 jumper can use to mute or shut down the power amplifier. To shutdown or mute this amplifier, shorten the JP1 jumper terminals.

Bottom side of the PCB with TPA3001D1 IC.

The Seeed Studio sponsor for this project. Seeed Fusion Service offers one-stop prototyping services for PCB manufacture, PCB assembly, and as a result, they produce superior quality PCBs and fast turnkey PCBA from 7 working days. Check out their website to know about their manufacturing capabilities and pricing.

The schematic and KiCAD PCB design files of this amplifier are available to download here.

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