NCP2809AEVB:  Stereo Audio Amplifier Evaluation Board

The NCP2809A is a cost-effective fixed gain stereo audio power amplifier capable of delivering 135 mW of continuous average power per channel into 16 ohm loads. This device has been specifically designed to provide high quality output power from low supply voltage, requiring very few external components. The device incorporates a proprietary virtual ground circuit which allows the speakers to be directly connected to the amplifier without the need for bulky DC blocking capacitors.

Since NCP2809 does not require bootstrap capacitors or snubber networks, it is optimally suited for low-power portable systems. The NCP2809A has an internal gain of 0 dB.

The demo board consists of two circuit configurations to demonstrate operation with and without the output DC blocking capacitors.
Features and Applications


  • 135 mW to a 16 ohm Load from a 5.0 V Power Supply
  • Excellent PSRR (85 dB Typical): Direct Connection to the Battery
  • Pop and Click Noise Protection Circuit
  • Ultra Low Current Shutdown Mode
  • 2.2 V - 5.5 V Operation
  • Outstanding Total Harmonic Distortion + Noise (THD+N): < 0.01%
  • Thermal Overload Protection Circuitry
Evaluation/Development Tool Information
Product Status Compliance Short Description Parts Used Action
NCP2809AEVB Active
Stereo Audio Amplifier Evaluation Board NCP2809ADMR2G
Technical Documents
Type Document Title Document ID/Size Rev
Eval Board: BOM NCP2809AEVB Bill of Material ROHS Compliant NCP2809AEVB_BOM.PDF - 70.0 KB  1 
Eval Board: Gerber NCP2809AEVB Gerber Layout Files (Zip Format) NCP2809AEVB_GERBER.ZIP - 40.0 KB  0 
Eval Board: Schematic NCP2809AEVB Schematic NCP2809AEVB_SCHEMATIC.PDF - 138.0 KB  0 
Eval Board: Test Procedure NCP2809AEVB Test Procedure NCP2809AEVB_TEST_PROCEDURE.PDF - 120.0 KB  0 
Video Stereo Audio Amplifier Evaluation Boards - NCP2809AEVB / NCP2809BGEVB WVD17541/D   
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Stereo Audio Amplifier Evaluation Boards - NCP2809AEVB / NCP2809BGEVB
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