Sylph-D200 TPA3255 48V Stereo (Ready to Run) Amplifier Module
Uses dedicated TPS7A49 ultralow-noise linear post regulator for TPA3255's xVDD supplies. And another TPS7A49 and TPS7A30 for the opamp buffer supplies.
A split supply is used in the opamp buffer section in order to remove the 4 pcs input DC blocking caps in the audio input signal path. The module does not require an external low voltage supply since the negative rail is being generated on-board.
The analog input can accept full balanced or single ended signals which can be configured by a solder jumper under the PCB. The output is 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 zobel network to ensure reliable operation.
Use of voltage supervisor IC to avoid large turn on-off pops or clicks.
The board has a passive PFFB configuration from slaa788a. PFFB is disabled by default and can be enabled/disabled by a solder jumper under the PCB.
Main Parts Used
Bulk caps: 1800uF, 63V Panasonic FC
Output inductors: VER2923-103KL
Buffer Opamps: OPA1656
1 pc Sylph-D200 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: 30.8x (~29.8dB)
Input sensitivity: 1V RMS
Input impedance: 10K Ω
Input configuration: SE / Balanced solder jumper
Load impedance: 4Ω or 8Ω
Idle dissipation: ~7W 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 (High Power Config)
- Single supply SMPS 48V DC, 350W or higher.
- Fosc should be ≥ 100kHz
- Should be able to handle large load capacitance
and can operate without burst mode on ~5W load.
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