STMicroelectronics EVAL-FDA903U-SA

Overview

EVAL-FDA903U-SA from STMicroelectronics is an automotive-grade evaluation board for the FDA803U and FDA903U digital Class-D audio power amplifiers in PowerSSO-36 slug-up package, supporting I²S/TDM and I²C interfaces, full diagnostics, and 3.3–18 V operation for battery-powered infotainment systems.

For engineers reviewing the EVAL-FDA903U-SA datasheet, EVAL-FDA903U-SA pinout, EVAL-FDA903U-SA application, or EVAL-FDA903U-SA equivalent, this board enables rapid validation of FDA903U amplifier performance in automotive head unit, digital cockpit, and ADAS audio subsystem design workflows.

Technical Context

The EVAL-FDA903U-SA implements a single-channel digital input Class-D amplifier reference platform with direct connection to FDA903U's PowerSSO-36 interface pins, including dedicated I²S/TDM data lanes, I²C control lines, diagnostic output, and thermal pad grounding. It supports configurable gain, mute, and fault reporting via on-board jumpers and test points.

Designed for AEC-Q100-compliant automotive audio applications, the board integrates input filtering, output LC reconstruction networks, and Kelvin-sense layout for accurate current monitoring - all aligned with FDA903U's 70 W/channel (4 Ω, 14.4 V) output capability and <0.05% THD+N at rated power.

Key Specifications

Availability

EVAL-FDA903U-SA is available at Aetrix Electronics and suitable for automotive infotainment development, digital cockpit prototyping, and ADAS audio subsystem validation requiring stable component supply and traceable evaluation hardware.

Supply support for EVAL-FDA903U-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, specializing in automotive, industrial, and power management solutions with broad analog, microcontroller, and power IC portfolios.

This evaluation board belongs to ST's FDA (Fully Digital Audio) amplifier ecosystem, designed specifically to accelerate qualification and integration of high-efficiency Class-D audio amplifiers in safety-critical automotive audio systems.

FAQ

What amplifier ICs does EVAL-FDA903U-SA support?

EVAL-FDA903U-SA is configured for FDA803U and FDA903U - single-channel, digital-input Class-D audio amplifiers in PowerSSO-36 package. Both devices share identical pinout, I²S/TDM protocol, and diagnostic architecture, enabling shared evaluation across the family without hardware modification.

Does the board include output filtering components?

Yes - the board integrates a second-order LC low-pass filter (inductor + capacitor) on each output channel, optimized for FDA903U's switching frequency and EMI compliance per CISPR 25 Class 5. Filter component values are documented in DB4037 Rev 2 schematic section.

Can EVAL-FDA903U-SA operate from a 5 V supply?

No - the board is designed for 3.3–18 V operation but requires ≥9 V to drive FDA903U's gate drivers and achieve rated output power. At 5 V, the amplifier enters undervoltage lockout (UVLO), disabling output stage and asserting diagnostic flag.

Is thermal management provided on the evaluation board?

Yes - the PCB uses 2 oz copper layers, internal thermal vias, and exposed copper under the PowerSSO-36 thermal pad to transfer heat to the board substrate. A heatsink mounting option is included, matching FDA903U's 1.5 °C/W junction-to-case specification when properly attached.