STMicroelectronics EVAL-FDA803D-SA

Overview

EVAL-FDA803D-SA from STMicroelectronics is a stand-alone evaluation board for the FDA803D 1×45W fully digital Class D audio power amplifier in PowerSSO-36 Slug Down package. It supports 3.3–18V supply, I²C/I²S programmability, dual feedback configurations (pre- or post-LC filter), and hardware enable/mute control via jumper-selectable pins. Designed for engineering validation of high-efficiency audio amplification in compact speaker systems.

For engineers reviewing the EVAL-FDA803D-SA datasheet, EVAL-FDA803D-SA pinout, EVAL-FDA803D-SA application, or EVAL-FDA803D-SA equivalent, this board enables rapid functional verification of FDA803D's digital audio performance-including THD+N, PSRR, and startup sequencing-under real-world load conditions with configurable LC filtering, thermal monitoring, and multi-address I²C control.

Technical Context

The EVAL-FDA803D-SA implements a complete 1-channel Class D amplifier reference design centered on the FDA803D IC, featuring a discrete power stage with STS10P4LLF6 MOSFETs and Coilcraft XAL5050-103ME output inductors. It integrates dual-mode feedback routing (via R5–R8 jumpers) to support either traditional PWM feedback or demodulated post-filter feedback for improved linearity.

Hardware control is provided through J10 (20×2 header) for I²C (SCL/SDA), I²S (CLK/WS/SDA1), EN1–EN4 address selection, MUTE, and CD/DIAG signals. The board includes on-board 470 µF/50 V bulk capacitance (C28), 3.3 V Zener clamping (D1/D2), and thermal sensing (THSENS pin routed to TP4).

Key Specifications

Availability

EVAL-FDA803D-SA is available at Aetrix Electronics and suitable for audio system prototyping, Class D amplifier qualification, and I²S-to-analog signal chain validation requiring stable component supply and documented reference design fidelity.

Supply support for EVAL-FDA803D-SA includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, analog ICs, power devices, and MEMS sensors for industrial, automotive, and consumer markets.

The FDA series - including FDA803D - was developed specifically for high-fidelity, low-EMI digital audio amplification in space-constrained applications such as smart speakers, soundbars, and automotive infotainment displays.

FAQ

Does EVAL-FDA803D-SA support FDA903D as well?

Yes - the board is mechanically and electrically compatible with both FDA803D and FDA903D, as confirmed in UM2447 Table 1 and Section 3. The same PCB layout (6038-443.16) and BOM are used for both devices, differing only in the U1 IC placement. No hardware modification is required to swap between them.

What LC filter components are installed by default?

The board ships with XAL5050-103ME (10 µH) inductors (L1/L2) and a 5 nF capacitor (C7) forming a 2nd-order low-pass filter optimized for 14.4 V operation into 4 Ω loads. This configuration balances EMI suppression, efficiency (>90%), and audible-band linearity per ST's characterization data.

How is I²C address configured on this board?

I²C address is set via EN1–EN4 pins (J10 pins 9–12), each pulled high by default and configurable to logic low using jumpers. This supports up to 8 unique addresses (0x48–0x4F) or 4 legacy operating modes per FDA803D datasheet Table 12, enabling multi-device daisy-chaining without software reconfiguration.

Is the EVAL-FDA803D-SA RoHS-compliant and CE-marked?

No - per UM2447 Section 2, this evaluation board is not intended as a finished end-product and does not comply with EU directives (RoHS, WEEE, CE), FCC, or UL requirements. It lacks final product-level safety isolation, EMC filtering, and environmental conformity documentation required for commercial deployment.