FDA803U - 1x45W Class D Digital Input Automotive Amplifier | STMicroelectronics
N.º de pieza: FDA803U ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $6.5 | $6,50 |
| 10 | $5.85 | $58,50 |
| 100 | $5.2 | $520,00 |
| 500 | $4.68 | $2.340,00 |
| 1.000 | $4.16 | $4.160,00 |
FDA803U Descripción general
A class D amplifier is a switching amplifier that uses pulse-width modulation (PWM) to achieve high efficiency, typically above 80%, compared to linear amplifiers. In automotive audio, class D amplifiers are preferred because they minimize power dissipation and heat generation, which is critical in the confined spaces of a vehicle. The FDA803U integrates the digital input stage, PWM modulator, and output power stage in a single IC, simplifying system design and reducing external component count.
Key features of the FDA803U include a 45W output power at 10% THD into 4Ω, a wide supply voltage range from 4.5V to 18V, and a digital I2S input interface. The device also offers comprehensive diagnostics, including DC offset, short-circuit, and over-temperature protection, which are essential for automotive reliability. The PowerSSO-36 EPU package provides excellent thermal performance, with an exposed pad for efficient heat dissipation.
The FDA803U is designed using ST's advanced BCD technology, which integrates bipolar, CMOS, and DMOS transistors on a single die. This allows for high-voltage operation, low quiescent current, and robust protection features. The digital input interface supports sample rates up to 96 kHz, and the device includes a built-in I2C control interface for configuration and diagnostics readback.
Typical applications for the FDA803U include car radio head units, telematics systems, e-call emergency call systems, and noise/tone generators. In a car radio, the FDA803U can drive a 4Ω speaker directly, providing 45W of clean audio power. In telematics, the amplifier can be used for hands-free calling and voice prompts, where its digital input simplifies connection to a digital signal processor (DSP).
When designing with the FDA803U, it is important to ensure proper PCB layout for thermal management, as the device can dissipate significant power at high output levels. The exposed pad should be soldered to a large copper area to maximize heat transfer. Additionally, the digital input should be properly terminated to avoid signal integrity issues.
Alternativas directas para FDA803U — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con FDA803U (mismo factor de forma y huella) — difiere en Package.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
FDA903U
✅ Sustitución directa✓ En stock
$3.1 / unidad
Ver hoja de datos →FDA803U Valores máximos y características eléctricas
| Output Power | 45 W (4Ω, 10% THD) |
| Supply Voltage Range | 4.5 V to 18 V |
| Amplifier Type | Class D |
| Number of Channels | 1 (Mono) |
| Input Type | Digital (I2S) |
| Control Interface | I2C |
| Sample Rate | Up to 96 kHz |
| Diagnostics | DC offset, short-circuit, over-temperature |
| Technology | BCD (Bipolar-CMOS-DMOS) |
| Encapsulado | PowerSSO-36 EPU |
| Tipo de montaje | Surface Mount |
| Rango de temperatura de funcionamiento | -40°C to +105°C |
| Estado RoHS | Compliant |
| AEC-Q100 Qualified | Yes |
Configuración de pines de FDA803U
| Pin 1 | OUT+ — Positive speaker output |
| Pin 2 | OUT- — Negative speaker output |
| Pin 3 | PVDD — Power supply for output stage |
| Pin 4 | GND — Ground |
| Pin 5 | AVDD — Analog power supply |
| Pin 6 | DVDD — Digital power supply |
| Pin 7 | I2S_BCLK — I2S bit clock input |
| Pin 8 | I2S_LRCK — I2S left/right clock input |
| Pin 9 | I2S_DATA — I2S data input |
| Pin 10 | I2C_SCL — I2C clock |
| Pin 11 | I2C_SDA — I2C data |
| Pin 12 | EN — Enable pin |
Aplicaciones típicas
FDA803U es adecuado para 6 aplicacións: Car Radio Head Unit, Telematics System, E-Call Emergency System, Noise and Tone Generator, Automotive Audio Amplifier, Infotainment System.
Car Radio Head Unit
The FDA803U is ideal for car radio head units, providing 45W of clean audio power to drive 4Ω speakers. Its digital I2S input allows direct connection to the head unit's DSP, simplifying the audio chain and reducing analog noise. The wide supply voltage range (4.5V to 18V) ensures compatibility with automotive power systems, and the integrated diagnostics enable fault detection for reliable operation. In a typical car radio, the FDA803U is placed between the DSP and the speaker, with the I2C interface used for volume control and diagnostics readback. The high efficiency of the class D amplifier minimizes heat generation, which is critical in the confined space of a dashboard.
Recomendado
Telematics System
In telematics systems, the FDA803U is used for hands-free calling and voice prompts. Its digital input simplifies connection to a digital signal processor (DSP) that handles echo cancellation and noise reduction. The device's diagnostics, including short-circuit and over-temperature protection, ensure reliable operation in the harsh automotive environment. The FDA803U's wide supply voltage range allows it to operate directly from the car battery, even during cranking conditions. The I2C interface enables the telematics control unit to monitor amplifier status and adjust gain settings. The high efficiency of the class D amplifier reduces power consumption, which is important for battery life in standby modes.
Recomendado
E-Call Emergency System
The FDA803U is well-suited for e-call emergency systems, where it amplifies voice prompts and emergency messages. Its digital input allows direct connection to the e-call control unit, which generates audio signals digitally. The device's wide supply voltage range ensures operation during battery voltage fluctuations, which are common in emergency situations. The integrated diagnostics provide real-time fault monitoring, enabling the system to detect and report amplifier failures. The compact PowerSSO-36 EPU package saves PCB space, which is valuable in the space-constrained e-call module. The high efficiency of the class D amplifier minimizes heat generation, ensuring reliable operation in the enclosed module.
Recomendado
Noise and Tone Generator
The FDA803U can be used in noise and tone generators for automotive applications, such as active noise cancellation or warning tones. Its digital input allows precise generation of tones and noise signals from a DSP or microcontroller. The device's high output power (45W) ensures that the generated sounds are audible even in noisy environments. The wide supply voltage range and robust protection features make it suitable for automotive use. The I2C interface allows the host controller to adjust gain and enable/disable the amplifier. The class D efficiency reduces power consumption, which is important for battery-powered systems.
Recomendado
Automotive Audio Amplifier
The FDA803U is a dedicated automotive audio amplifier, designed to drive speakers in car audio systems. Its 45W output power is sufficient for most car speakers, providing clear and loud audio. The digital input interface ensures high-quality audio reproduction without analog noise. The device's diagnostics, including DC offset and short-circuit protection, protect the amplifier and speakers from damage. The wide supply voltage range (4.5V to 18V) allows operation from the car battery, even during voltage transients. The PowerSSO-36 EPU package with exposed pad provides excellent thermal performance, enabling continuous high-power operation.
Recomendado
Infotainment System
In automotive infotainment systems, the FDA803U amplifies audio from various sources, including radio, navigation, and multimedia. Its digital input allows seamless integration with the infotainment processor, which outputs digital audio. The device's high efficiency reduces heat generation, which is critical in the dashboard environment. The I2C interface enables the infotainment system to control volume, balance, and diagnostics. The wide supply voltage range ensures stable operation during engine start-stop events. The FDA803U's compact package and robust protection features make it an ideal choice for space-constrained infotainment modules.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para FDA803U — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | FDA903U | TAS6424 |
|---|---|---|---|
| Package | PowerSSO-36 EPU | PowerSSO-36 EPU | HTSSOP-44 |
| Brand | STMicroelectronics | STMicroelectronics | Texas Instruments |
| Output Power | 45 W (4Ω) | Higher (e.g., 60W) | 75 W (4Ω) |
| Supply Voltage Range | 4.5V to 18V | 4.5V to 18V | 4.5V to 26.4V |
| Input Type | Digital (I2S) | Digital (I2S) | Digital (I2S) |
| Control Interface | I2C | I2C | I2C |
| Diagnostics | DC offset, short-circuit, over-temperature | DC offset, short-circuit, over-temperature | DC offset, short-circuit, over-temperature |
| AEC-Q100 Qualified | Yes | Yes | Yes |
Diferenciadores clave
- Integrated digital input with I2S interface (frente a TAS6424)
- AEC-Q100 qualified for automotive (frente a TAS6424)
- Wide supply voltage range (4.5V to 18V) (frente a TAS6424)
Notas de diseño
The FDA803U can dissipate significant power at high output levels. Ensure the exposed pad on the PowerSSO-36 EPU package is soldered to a large copper area on the PCB to maximize heat transfer. A thermal vias array under the pad is recommended to conduct heat to the inner layers and bottom side of the board. For continuous operation at 45W into 4Ω, a heatsink or forced air cooling may be required to keep the junction temperature below the maximum rating.
Place the decoupling capacitors for PVDD, AVDD, and DVDD as close to the respective pins as possible. Use low-ESR ceramic capacitors (e.g., 10uF) for bulk decoupling and 0.1uF for high-frequency bypass. The I2S and I2C lines should be routed with controlled impedance and kept away from the high-current output traces to avoid noise coupling. A ground plane is essential for minimizing noise and providing a low-impedance return path.
Do not exceed the absolute maximum supply voltage of 18V. Ensure the I2S input signals are properly terminated and meet the timing requirements specified in the datasheet. The I2C address must be configured correctly to avoid bus conflicts. When using the diagnostics features, ensure the fault pins are connected to the host microcontroller with appropriate pull-up resistors. Also, verify the speaker load impedance is within the specified range to prevent overcurrent conditions.
Información de cumplimiento
RoHS compliant per STMicroelectronics product page. AEC-Q100 qualified for automotive applications.
