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TPA3255PBTL

EliMattingly22·TPA3255_ClassD_PBTL

TPA3255PBTL PCB layout, top view — open source board by EliMattingly22

About the TPA3255PBTL PCB

TPA3255PBTL is an open source PCB design by EliMattingly22, published on GitHub under the MIT license. It is a 4-layer board measuring 140 × 90 mm, with 137 components from 47 distinct parts.

Other key parts include the TPA3255DDV, L78L12_SOT89, L78L33_SO8, AD8512 and XL7015. By type, the board carries 52 resistors, 44 capacitors, 8 test points, 7 ICs, 7 connectors and 6 diodes.

It belongs with the audio designs in this gallery.

From the project

A KiCAD project for the TPA3255 amplifier in PBTL mode

This repository contains schematics, PCB layout and documentation for a compact, rack mountable PBTL (Parallel Bridged) Class‑D amplifier based on the Texas Instruments TPA3255. The design is intended to house three amplifier modules in a single 2U rack enclosure and includes front‑panel controls such as button‑enabled DC‑coupling, balanced XLR inputs/outputs, and protection/status indicators.

TPA3255PBTL, from the project README
From the project README

Main components on the TPA3255PBTL

TPA3255DDVL78L12_SOT89L78L33_SO8AD8512XL7015

TPA3255PBTL bill of materials (BOM)

137 components, 47 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
TPA3255DDV
U1
1
L78L12_SOT89
U2
1
L78L33_SO8
U3
3
AD8512
U4, U6, U7
1
XL7015
U5
1
DMP4015SK3
Q1
4
DMN10H220L
Q2, Q3, Q4, Q5
1
Barrel_Jack_Switch
J1
2
AC3FAH2-XLR
J2, J7
1
SCREW_TERMINAL_01X02
Screw_Terminal_01x02
J3
2
CONN_01X02_PIN
Conn_01x02_Pin
J4, J5
1
AC3MAH-AU-PRE
J6
1
500
RV1
1
PB400EEQX
S1
1
PB400OAQX
S2
8
TestPoint
TP1, TP2, TP3, TP4, TP5, TP6, TP7, TP8
1
D_TVS
D1
1
6.3V
D2
3
LED_Dual_KAKA
D3, D5, D6
1
D_Schottky
D4
Show 27 more
QtyPartRefs
1
100U
100u
L1
2
10U
10u
L2, L3
2
22U
22u
L4, L5
1
4700U
4700u
C1
4
1u
C2, C3, C6, C7
10
100N
100n
C4, C5, C10, C12, C15, C24, C25, C26 +2
6
1u
C8, C11, C14, C17, C36, C37
3
20U
20u
C9, C28, C30
3
1u
C13, C40, C41
4
10N
10n
C16, C20, C27, C43
2
1n
C18, C19
3
47U
47u
C21, C22, C38
5
33N
33n
C23, C32, C33, C34, C35
1
47N
47n
C42
2
330P
330p
C44, C45
21
10K
10k
R1, R2, R3, R9, R11, R12, R13, R21 +13
5
0
R4, R14, R15, R16, R17
3
2.7K
2.7k
R5, R19, R35
2
3.3
R6, R7
2
3R3
R8, R10
2
30K
30k
R18, R30
4
4.7K
4.7k
R20, R22, R25, R28
4
47K
47k
R23, R26, R32, R33
6
1k
R24, R27, R36, R39, R50, R51
1
22K
22k
R29
1
470
R34
1
DNP
R41

TPA3255PBTL design files

The KiCad project lives in the EliMattingly22/TPA3255_ClassD_PBTL repository on GitHub; these links point at the commit this page was built from.

TPA3255PBTL: common questions

How big is the TPA3255PBTL PCB?

The TPA3255PBTL measures 140 × 90 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the TPA3255PBTL?

137 components, from 47 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the TPA3255PBTL design files?

From the EliMattingly22/TPA3255_ClassD_PBTL repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the TPA3255PBTL design in my own project?

Yes, under the terms of its MIT license, which EliMattingly22 chose for the repository.

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