Overview
The TDA7850A is a high-performance MOSFET technology class AB audio power amplifier designed by STMicroelectronics. It is packaged in a Flexiwatt27 package, making it ideal for high-power car radio applications. The amplifier features a fully complementary P-Channel/N-Channel output structure, allowing for a rail-to-rail output voltage swing. This design combines high output current with minimized saturation losses, setting new power and distortion performance standards in the car-radio field.
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 A (repetitive), 10 A (non-repetitive) | A |
| Power Dissipation (Ptot) at Tcase = 70 °C | 80 | W |
| Junction Temperature (Tj) | 150 | °C |
| Storage Temperature (Tstg) | -55 to 150 | °C |
| Output Power at 4 Ω | 4 x 50 W max, 4 x 30 W @ 14.4 V, 1 kHz, 10 % | W |
| Output Power at 2 Ω | 4 x 80 W max, 4 x 55 W @ 14.4 V, 1 kHz, 10 % | W |
Key Features
- MOSFET output power stage
- Excellent 2 Ω driving capability
- Hi-Fi class distortion
- Low output noise
- Standby function
- Mute function
- Automute at minimum supply voltage detection
- Low external component count:
- Internally fixed gain (26 dB)
- No external compensation
- No bootstrap capacitors
- On-board 0.35 A high side driver
- Protections:
- Output short circuit to GND, to Vs, across the load
- Very inductive loads
- Overrating chip temperature with soft thermal limiter
- Output DC offset detection
- Load dump voltage
- Fortuitous open GND
- Reversed battery
- ESD protection
- DC offset detector to prevent speaker damage
Applications
The TDA7850A is primarily designed for high-power car radio applications, offering superior audio performance and robust protection features. It is suitable for use in automotive infotainment systems where high-quality audio and reliability are critical.
Q & A
- What is the maximum output power of the TDA7850A at 4 Ω?
The maximum output power is 4 x 50 W at 4 Ω.
- What is the maximum output power of the TDA7850A at 2 Ω?
The maximum output power is 4 x 80 W at 2 Ω.
- What are the key protection features of the TDA7850A?
The TDA7850A includes protections such as output short circuit to GND, to Vs, across the load, very inductive loads, overrating chip temperature with soft thermal limiter, output DC offset detection, load dump voltage, fortuitous open GND, reversed battery, and ESD protection.
- What is the purpose of the DC offset detector in the TDA7850A?
The DC offset detector prevents an anomalous DC offset on the inputs from being multiplied by the gain, which could result in a dangerous large offset on the outputs and potentially damage the speakers.
- What is the operating supply voltage range for the TDA7850A?
The operating supply voltage range is up to 18 V, with a peak supply voltage of 50 V for t = 50 ms.
- What is the junction temperature limit for the TDA7850A?
The junction temperature limit is 150 °C.
- Does the TDA7850A have a standby function?
Yes, the TDA7850A includes a standby function.
- What is the significance of the internally fixed gain in the TDA7850A?
The internally fixed gain of 26 dB eliminates the need for external compensation and bootstrap capacitors, reducing the external component count.
- Is the TDA7850A suitable for driving 2 Ω loads?
Yes, the TDA7850A has excellent 2 Ω driving capability.
- What is the thermal resistance junction to case for the TDA7850A?
The thermal resistance junction to case is a maximum of 1 °C/W.
