Overview
The TDA7850ASM, produced by STMicroelectronics, is a high-performance MOSFET technology class AB audio power amplifier designed specifically for high-power car radio applications. It is packaged in the Flexiwatt 25 format, which is optimized for automotive use. The amplifier features a fully complementary P-Channel/N-Channel output structure, enabling a rail-to-rail output voltage swing. This design combines high output current with minimized saturation losses, setting new standards in power and distortion performance for car radio systems.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Operating Supply Voltage (VS) | 18 | V |
| DC Supply Voltage (VS DC) | 28 | V |
| Peak Supply Voltage (VS pk) | 50 | V (for t = 50 ms) |
| Output Peak Current (IO) | 9 / 10 | A (repetitive / non-repetitive) |
| Power Dissipation (Ptot) | 80 | W (Tcase = 70 °C) |
| Junction Temperature (Tj) | 150 | °C |
| Storage Temperature (Tstg) | -55 to 150 | °C |
| Thermal Resistance (Rth j-case) | 1 | °C/W |
| Output Power (Po) | 4 x 50 W / 4 Ω max, 4 x 30 W / 4 Ω @ 14.4 V, 1 kHz, 10% | W |
| Output Power (Po) at 2 Ω | 4 x 80 W / 2 Ω max, 4 x 55 W / 2 Ω @ 14.4 V, 1 kHz, 10% | W |
Key Features
- MOSFET Output Power Stage: Utilizes MOSFET technology for high efficiency and low distortion.
- High Output Power Capability: Delivers up to 4 x 50 W at 4 Ω and 4 x 80 W at 2 Ω.
- Excellent 2 Ω Driving Capability: Capable of driving low impedance loads with high fidelity.
- Hi-Fi Class Distortion: Offers low distortion levels, ensuring high-quality audio output.
- Low Output Noise: Minimized noise for clear and clean audio.
- Standby and Mute Functions: Includes CMOS compatible standby and mute facilities.
- Automute at Min. Supply Voltage Detection: Automatically mutes the amplifier at minimum supply voltage.
- Low External Component Count: Internally fixed gain (26 dB), no external compensation, and no bootstrap capacitors required.
- On Board 0.35 A High Side Driver: Integrated high side driver for simplified circuit design.
- Protections: Includes protections for output short circuit, overrating chip temperature, output DC offset detection, load dump voltage, fortuitous open ground, reversed battery, and ESD.
- DC Offset Detector: Prevents dangerous DC offsets that could damage speakers.
Applications
The TDA7850ASM is primarily designed for high-power car radio systems, where its high output power capability, low distortion, and robust protection features are particularly beneficial. It is also suitable for other automotive audio applications requiring high fidelity and reliability.
Q & A
- What is the maximum output power of the TDA7850ASM at 4 Ω and 2 Ω?
The TDA7850ASM can deliver up to 4 x 50 W at 4 Ω and 4 x 80 W at 2 Ω.
- What type of output stage does the TDA7850ASM use?
The TDA7850ASM uses a MOSFET output power stage.
- What are the key protection features of the TDA7850ASM?
The amplifier includes protections for output short circuit, overrating chip temperature, output DC offset detection, load dump voltage, fortuitous open ground, reversed battery, and ESD.
- Does the TDA7850ASM have built-in standby and mute functions?
- What is the thermal resistance junction-to-case of the TDA7850ASM?
The thermal resistance junction-to-case is 1 °C/W.
- What is the storage temperature range for the TDA7850ASM?
The storage temperature range is -55 to 150 °C.
- Does the TDA7850ASM require external compensation or bootstrap capacitors?
No, the TDA7850ASM has an internally fixed gain (26 dB) and does not require external compensation or bootstrap capacitors.
- What is the purpose of the DC offset detector in the TDA7850ASM?
The DC offset detector prevents dangerous DC offsets that could damage speakers.
- Can the TDA7850ASM drive low impedance loads?
- What is the typical quiescent current of the TDA7850ASM?
The typical quiescent current is 180 mA.
