TPA3255 PFFB 48V Stereo (Ready to Run) Amplifier Module
High performance TPA3255 post filter feedback implementation. 2 channel, stereo BTL configuration.
Includes transient voltage protection 62V SCR which will fail short in overvoltage scenarios. TVS diode for power supply surge protection, and will normally fail short when an accidental reverse polarity is applied.
Use of oversized capacitors and resistors for the PFFB zobel network to ensure reliable operation. Use of voltage supervisor IC to avoid large turn on-off pops or clicks.
PFFB can be enabled / disabled by solder jumpers under the PCB.
THD Performance QA400
(VER2923-103KL and 48V DC)
5W 8Ω: 0.0007% THD
10W 8Ω: 0.0008% THD
5W 4Ω: 0.0012% THD
10W 4Ω: 0.0014% THD
Output Integrated Noise:
(A-Weighted) = 30 uVrms
Main Parts Used
Bulk caps: EEU-FC1J182
Output inductors: VER2923-103KL
Buffer Opamps: OPA1656 + Adapter
1 pc stereo Ready to Run module.
6 pc female faston tab connector.
2 pc female 2.54 mm 3 pin connector.
Recommended Voltage: 48V DC
Power (<1% THD+N): 110W-8Ω, 220W-4Ω
Voltage gain: 10.9x (~21dB)
Input sensitivity: 2.7V RMS
Input impedance: 10K Ω
Input configuration: SE / Balanced solder jumper
Load impedance: 4Ω or 8Ω
Idle dissipation: 4W at 48V DC
Footprint: 148mm x 100mm x 55mm (L * W * H)
Number of PCB Layers: 2 layer copper
Overcurrent /short protection: Yes
Over voltage protection: Yes
Overheat protection: Yes
Turn on-off pop suppression: Yes
Gross packed weight: 650g
Recommended Power Supply (NOT INCLUDED)
- Single supply SMPS 48V DC, 400W or higher.
- Fosc should be ≥ 100kHz
- Should be able to handle large load capacitance
and can operate normally on ~5W load.
Notes on Input Sensitivity
2.7Vrms is needed to drive the amp into near clipping condition (1% THD).
A 1Vrms input can fill a small room with loud music.
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If you can solder, and the ATS heatsink and the rail capacitors are available in your location, check out the partially assembled module in our products page.
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