Compact Audio Amplifier Designed Specifically For Automotive Applications

By Jay Soni

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The FDA903S is the new ST single channel class-D audio amplifier offering speaker control and system robustness/ reliability.

Cresit : STMicroelectronics

STMicroelectronics FDA903S Class-D Automotive Audio Amplifier is specifically designed for automotive applications, especially e-Call and telematics. The FDA903S incorporates a 24-bit, 100dB DAC conversion and PWM class-D output stage with feedback before the LC filter. This configuration can create the design of a compact and inexpensive application.

The STM FDA903S Class-D Automotive Audio Amplifier supports I2S and TDM digital bit streams up to 16CH with several sampling frequencies from 8kHz to 96kHz. FDA903S embeds a complete diagnostic in play, including real-time load-current monitoring and a digital admittance meter, to deliver the most demanding OEM requirements regarding speaker control and system robustness/ reliability. The FDA903S supports start stop cranking down to 3.3V.

Features
  • AEC-Q100 qualified
  • Integrated 100 dB D/A conversion
  • I2S and TDM digital input (up to 16CH TDM)
  • Selectable input sample rate frequency (8/16/32/44.1/48/96)
  • 3.3V to 18V Wide supply operating range
  • PWM frequency switching selectable by I2C352.8kHz, 384kHz, 411.6kHz, 448kHz
  • 2x I2C addresses
  • MOSFET power outputs
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-Typ 10W 4Ω @ 14.4V, 1kHz THD = 1%

-Typ 5W 8Ω @ 14.4V, 1kHz THD = 1%

  • Noise: 80μV A-weighted: 20kHz
  • 8Ω, 4Ω driving capability
  • Input amplitude limiter (configurable through I2C)
  • Load current monitor
  • 2 CD/Diag pin
  • Integrated ESD and short circuit protection
  • I2C full configurability and diagnostic

-Startup diagnostic
-Input voltage amplitude limiter function (configurable through I2C)
-4x Thermal warning
-DC diagnostic
-OCP protection scheme configurable
-Mute time configuration
-DAM (Digital-Admittance-Meter)

  • Capability to run a complete diagnostic in play

-Configurable clipping detector
-One of the thermal warnings
-Over current protection
-Open load detection
-High voltage mute

  • QFN32 with wettable flanks

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