Sylph-D200 TPA3255 PFFB 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. Each opamp has a separate bulk capacitance on its positive and negative rails.
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. SE input is enabled by default unless otherwise requested.
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 bulk capacitance in AVDD and GVDD supplies for improvement in sound quality.
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.
Can be configured as mono PBTL (requires skilled modifications).
Input coupling caps can be changed to 7.5 x 7.5mm, 5mm pitch poly caps.
Capacitor for PVDD is either Nippon Chemi-con KZN/KYA/KYB Series or Panasonic FC series whichever is available. (Current available is Nippon Chemi-con KZN)
Main Parts Used (Top Tier)
Bulk caps: 1500uF, 63V United Chemi-Con KZN
Output inductors: VER/AGP2923-103KL
Input coupling caps: Elna Silmic II
Buffer Opamps: OPA1656
Generic heatsink (100mm x 30mm x 30mm)
No opamps, no heatsink*
*Heatsink is available in Mouser.com
*Recommended opamp alternative: LME49720NA
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 to 48V DC
Power (<1% THD+N): 110W-8Ω, 220W-4Ω
Input sensitivity - SE (PFFB disabled): 1V RMS
Input sensitivity - SE (PFFB enabled): 2V RMS
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: ~7W at 48V DC
Footprint: 148mm 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: 600g
Recommended Power Supply
- Single supply SMPS 48V DC, 350W or higher.
- Fosc should be ≥ 100kHz (LLC preferred)
- Should be able to handle large load capacitance
and can operate without burst mode on ~5W load.
- Mean Well SE-450-48 adjusted to 45V DC
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