SylphAudio D100 TPA3251 PFFB Stereo Amplifier Module (Ready to Run)
Mid-power chip-based class-D amplifier with sound improvements through optimization and careful parts selection. TPA3251 chip was selected for best midrange clarity.
Analog inputs can accept differential or single ended signals configurable via solder jumpers. The output is 2 channel, stereo BTL configuration. Balanced input is recommended and is enabled by default unless otherwise requested.
A split supply is used in the opamp buffer section in order to delete the redundant input coupling caps in the frontend audio path which helps to make the sound ultra-transparent. The opamp rail supplies are being generated on-board with positive and negative post regulators.
Use of bulk capacitance in AVDD supply, and various tweaks to improve the sound quality. Choice of input coupling cap and output inductor (dominant second harmonic) was made to add warmth to the TPA3251 signature sound.
Use of voltage supervisor IC to avoid large turn on/off pops.
Input coupling caps layout can accommodate 7.5mm x 7.5mm, 5mm pitch poly caps.
It uses the same ATS heatsink that can be found on official Texas Instruments TPA3255 EVM modules.
Solder jumper for slave setting, OSC IOM/IOP pads are under the PCB for multi-device configuration. (SLAA787)
Latest version: P02, permanent PFFB mode, reaching -100dB THD+N and -108dB THD at 5W 4ohms, and probably one of the best sounding amps available in the market.
1 pc Sylph-D100 stereo Ready to Run module.
2 pc female 2.54 mm 3 pin connector.
Supply Voltage: 24V DC min to 38V DC max
Unclipped Power (36V Supply): 45W-8Ω, 90W-4Ω
Input sensitivity - Balanced (PFFB disabled): 2V RMS
Input sensitivity - Balanced (PFFB enabled): 4V RMS
Input impedance: 10K Ω
Input configuration: SE / Balanced (solder jumper)
Load impedance: 4Ω or 8Ω
Idle dissipation: ~6.5W at 36V DC
Footprint: 133mm x 100mm x 45mm (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: 400g
ATS Heatsink Part No.
Recommended Power Supply
- 36V DC Single supply SMPS 200W or higher.
- DO NOT use power supply with split rails.
- Mean Well LRS-200-36 or LRS-150-36
- Use 32V DC for unregulated supplies
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