Overview
The TDA7850H, produced by STMicroelectronics, is a high-performance MOSFET quad bridge power amplifier designed specifically for high-power car radio applications. This component leverages breakthrough MOSFET technology to deliver exceptional audio quality and power efficiency. The TDA7850H is packaged in the Flexiwatt 25 format, both in vertical and horizontal configurations, making it versatile for various car audio systems. It features a fully complementary P-Channel/N-Channel output structure, enabling a rail-to-rail output voltage swing, high output current, and minimized saturation losses, which collectively set new standards in car radio audio performance.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Operating Supply Voltage (VS) | 8 - 18 | V |
| Peak Supply Voltage (VS pk) | 50 | V |
| Output Peak Current (IO) | 9 (repetitive), 10 (non-repetitive) | A |
| Power Dissipation (Ptot) | 80 | W |
| Junction Temperature (Tj) | -55 to 150 | °C |
| Storage Temperature (Tstg) | -55 to 150 | °C |
| Quiescent Current (Iq1) | 100 - 280 | mA |
| Output Power (Po) @ 4Ω, 14.4V, 1kHz, 10% THD | 30 | W |
| Output Power (Po) @ 2Ω, 14.4V, 1kHz, 10% THD | 55 | W |
| Voltage Gain (Gv) | 25 - 27 | dB |
| Harmonic Distortion (THD) @ 4W, 2Ω | 0.006 | % |
Key Features
- High output power capability: up to 4 x 50 W/4 Ω and 4 x 80 W/2 Ω
- MOSFET output power stage for high efficiency and low distortion
- Excellent 2 Ω driving capability
- Hi-Fi class distortion performance
- Low output noise
- ST-BY and Mute functions with CMOS compatibility
- Automute at minimum supply voltage detection
- Low external component count: internally fixed gain (26 dB), no external compensation, and no bootstrap capacitors
- On-board 0.35 A high side driver
- Comprehensive protection features including output short circuit, overrating chip temperature, output DC offset detection, load dump voltage, and reversed battery protection
Applications
The TDA7850H is specifically designed for high-power car radio and automotive audio systems. It is ideal for applications where high output power, low distortion, and robust protection features are required. The component ensures that the audio output remains stable and of high quality even during car engine start/stop cycles, meeting the stringent requirements of modern automotive entertainment systems.
Q & A
- What is the maximum output power of the TDA7850H at 4Ω and 14.4V?
The maximum output power is 50 W per channel at 4Ω and 14.4V with 10% THD. - What is the voltage gain of the TDA7850H?
The voltage gain is 25 to 27 dB. - What are the key protection features of the TDA7850H?
The key protection features include output short circuit to ground, to Vs, and across the load, overrating chip temperature with soft thermal limiter, output DC offset detection, load dump voltage, fortuitous open ground, and reversed battery protection. - How does the TDA7850H handle DC offset detection?
The TDA7850H integrates a DC offset detector that signals any anomalous DC offset on the inputs to prevent large offsets on the outputs, which could damage speakers. This feature is enabled via the MUTE pin and works with the amplifier unmuted and no signal on the inputs. - What is the recommended thermal resistance for the heatsink of the TDA7850H?
The recommended thermal resistance for the heatsink should be approximately 2°C/W to avoid thermal shutdown during long-term and full-volume operation. - Can the TDA7850H operate normally during car engine start/stop cycles?
Yes, the TDA7850H is designed to ensure that the audio output remains stable and of high quality even during car engine start/stop cycles, meeting the requirements of modern automotive entertainment systems. - What is the maximum junction temperature of the TDA7850H?
The maximum junction temperature is 150°C. - What is the minimum recommended value for the SVR capacitor in the TDA7850H circuit?
The minimum recommended value for the SVR capacitor is 10µF to optimize ripple rejection and pop optimization during ON/OFF transients. - Does the TDA7850H require external compensation or bootstrap capacitors?
No, the TDA7850H does not require external compensation or bootstrap capacitors due to its internally fixed gain and integrated design. - What is the bandwidth of the TDA7850H?
The bandwidth of the TDA7850H is up to 20 kHz.
