[D400M P05] TPA3255 Mono PBTL RTR Kit

A high-power mono amplifier module built for flexible system integration and demanding low-impedance operation.

This module is based on the TPA3255 in a mono PBTL, non-PFFB configuration and is intended for applications where high output power, configurability, and robust protection are required.

The amplifier delivers 250 W into 4 Ω at 1% THD+N, with stable operation across a wide range of speaker loads.

Signal Options
The input stage supports both full differential and single-ended signal configurations, allowing easy integration into a variety of audio systems.

Replaceable Op-Amp Socket
A socketed input-stage op-amp allows users to select or replace the op-amp IC, providing flexibility for system tuning or maintenance without board modification.

Split Supply Design
The op-amp buffer section uses a split supply, eliminating redundant input coupling capacitors at the frontend. This reduces the number of components in the signal path and helps preserve signal integrity.

Low-Impedance Capability
The module is capable of driving 2 Ω loads, delivering up to 600 W (20 Hz–20 kHz, clipping conditions) without triggering protection, making it suitable for subwoofer and high-current applications.

Protection and Reliability Features

-TVS diode for power supply surge protection
-Reverse polarity protection* to prevent damage from incorrect supply connection
-Voltage supervisor IC for silent turn-on and turn-off behavior, minimizing audible pops or clicks
-An official ATS heatsink designed for the TPA3255 is used to ensure effective thermal dissipation and stable operation, even in sustained high-current or 2 Ω subwoofer setups.

Multi-Device Configuration Support
-Solder jumpers allow straightforward configuration for master/slave operation in multi-module systems
-Accessible OSC IOM / IOP pads located on the underside of the PCB enable channel expansion and system scaling (refer to SLAA787 for configuration details)

*Requires power supply with overcurrent protection.

Elna Silmic II input coupling caps.

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Package Includes
Sylph-D400M P05 mono, options below
Connectors for RTR options

Specifications:
Supply Voltage: 26V DC min to 52V DC max
Unclipped Power (<1% THD+N, 52V): 115W-8Ω, 220W-4Ω, 400W-2Ω
Input sensitivity - SE: 2.1V RMS
Input sensitivity - BAL: 4.2V RMS
Voltage gain (BAL): 16.4dB (6.6V/V)
Voltage gain (SE): 22.4dB (13.2V/V)
THD+N (5W 4Ω, 1kHz): -98dB
Input configuration: SE / Balanced (header jumper)
Load impedance: 2Ω, 4Ω, or 8Ω
Footprint: 110mm x 100mm x 45mm (L * W * H)
Overcurrent /short protection: Yes
Over voltage protection: No
Overheat protection: Yes
Turn on-off pop suppression: Yes

Recommended Power Supply
(NOT INCLUDED)
- Single supply 51V SMPS, 300W or higher per module.
- DO NOT use power supply with split rails.
- LOF550-20B48-C or SE-450-48 adjusted to 51V
- Use 43V for unregulated "linear" supplies
- Use 51V for 2Ω loads, up to 52V for 4Ω loads

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Shipping
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Prices are subject to change without prior notice.