Overview
The TDA7851A is a class AB audio power amplifier designed by STMicroelectronics for high-power car radio applications. It utilizes breakthrough MOSFET technology and features a fully complementary P-Channel/N-Channel output structure, allowing for a rail-to-rail output voltage swing. This design, combined with high output current and minimized saturation losses, sets new power references in the car-radio field with unparalleled distortion performance.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Operating Supply Voltage (VS) | 18 | V |
| Peak Supply Voltage (VS pk) | 50 | V |
| Output Peak Current (Non-repetitive) | 10 A | A |
| Output Peak Current (Repetitive) | 9 A | A |
| Power Dissipation (Ptot) | 85 W | W |
| Junction Temperature (Tj) | 150 °C | °C |
| Storage Temperature (Tstg) | -55 to 150 °C | °C |
| Maximum Output Power (4 Ω) | 4 x 48 W | W |
| Maximum Output Power (2 Ω) | 4 x 72 W | W |
| Distortion (THD) at 4 W | 0.01 - 0.05 % | % |
| Output Noise (eNo) | 35 - 50 µV | µV |
| Supply Voltage Rejection (SVR) | 50 - 70 dB | dB |
| High Cut-off Frequency (fch) | 100 - 300 kHz | kHz |
| Input Impedance (Ri) | 70 - 130 kΩ | kΩ |
Key Features
- Multipower BCD technology
- High output power capability: 4 x 48 W/4 Ω Max., 4 x 28 W/4 Ω @ 14.4 V, 1 kHz, 10%, 4 x 72 W/2 Ω Max.
- MOSFET output power stage
- Excellent 2 Ω driving capability
- Hi-Fi class distortion
- Low output noise
- Standby and mute functions
- Automute at minimum supply voltage detection
- Internally fixed gain (26 dB), no external compensation, no bootstrap capacitors
- 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
Applications
The TDA7851A is specifically designed for high-power car radio applications, offering high output power and excellent distortion performance, making it ideal for automotive audio systems.
Q & A
- What is the maximum output power of the TDA7851A at 4 Ω?
The maximum output power is 4 x 48 W at 4 Ω. - What is the maximum output power of the TDA7851A at 2 Ω?
The maximum output power is 4 x 72 W at 2 Ω. - What type of output stage does the TDA7851A use?
The TDA7851A uses a MOSFET output power stage. - Does the TDA7851A have built-in protection features?
Yes, it 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. - What is the typical distortion level of the TDA7851A?
The distortion level is typically between 0.01% and 0.05% at 4 W output. - Does the TDA7851A have standby and mute functions?
Yes, it includes both standby and mute functions, as well as an automute feature at minimum supply voltage detection. - What is the input impedance of the TDA7851A?
The input impedance is between 70 kΩ and 130 kΩ. - What is the high cut-off frequency of the TDA7851A?
The high cut-off frequency is between 100 kHz and 300 kHz. - Is the gain of the TDA7851A internally fixed?
Yes, the gain is internally fixed at 26 dB, with no need for external compensation or bootstrap capacitors. - What package type is the TDA7851A available in?
The TDA7851A is available in the Flexiwatt 27 package.
