Sylph-D200 TPA3251 BTL 36V Stereo (Ready to Run) Amplifier Module
Uses dedicated TPS7A49 ultra-low noise linear post regulator for VDD supply. 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 4pc input coupling caps in the audio signal path. The module does not require an auxiliary 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 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: 1500uF, 50V Panasonic FC
Output inductors: VER2923-682KL
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: 36V DC only
Power (<1% THD+N): 50W-8Ω, 100W-4Ω
Voltage gain: 26x (~28.3 dB)
Input sensitivity: 0.8V RMS
Input impedance: 10K Ω
Input configuration: SE / Balanced solder jumper
Load impedance: 4Ω or 8Ω
Idle dissipation: ~5W at 36V 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 36V DC, 200W or higher.
- Better if Fosc ≥ 100kHz
- Should be able to handle large load capacitance
and can operate without burst mode on ~5W load.
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