EVAL-SSM3515Z: 25W @ 4Ω, Class D, 4.5 ~ 17V in

The EVAL-SSM3515Z is an evaluation board for quick evaluation of the SSM3515. The board uses a single supply from 4.5 V to 17 V. The board includes 3.3 V and 1.8 V regulators. The on-board digital SPDIF optical input generates the serial digital signal to the SSM3515. The board provides register control using USBi with SigmaStudio™-based GUI or the Total Phase Aardvark™ I2C/SPI Host Adapter.

The application circuit requires a minimum of external components and can operate from a single 4.5 V to 17 V supply. It is capable of delivering 8 W of continuous output power into an 8 Ω load, and 15 W into an 4 Ω load from a 12 V power supply. The board can deliver 25 W into a 4 Ω load from a 16 V power supply, all with <1% total harmonic distortion + noise (THD + N); however, output powers above 20 W are not continuous due to the thermal limit.

This user guide describes how to configure and use the EVAL-SSM3515Z evaluation board. When using the evaluation board, consult this user guide in conjunction with the SSM3515 data sheet, which provides specifications, internal block diagrams, and application guidance for the amplifier IC.

The EVAL-SSM3515Z evaluation board includes a complete circuit for driving a loudspeaker. Figure 1 shows the top view of the evaluation board, and Figure 2 shows the bottom view of the evaluation board.