Overview
The TDA7851F is a high-performance MOSFET technology class AB audio power amplifier designed by STMicroelectronics for high-power car radio applications. This 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 and minimized saturation losses, setting new power and distortion performance standards in the car-radio field.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Output Power (Max.) | 4 x 48 W | @ 4 Ω |
| Output Power (Typ.) | 4 x 28 W | @ 4 Ω, 14.4 V, 1 kHz, 10% |
| Output Power (Max.) at 2 Ω | 4 x 72 W | |
| Operating Supply Voltage | 8 to 18 | V |
| Peak Supply Voltage | 50 | V (for t = 50 ms) |
| Output Peak Current (Non-Repetitive) | 10 | A (t = 100 μs) |
| Output Peak Current (Repetitive) | 9 | A (duty cycle 10% at f = 10 Hz) |
| Power Dissipation (Tcase = 70 °C) | 85 | W |
| Junction Temperature | 150 | °C |
| Storage Temperature | -55 to 150 | °C |
| Distortion (THD) | 0.01 to 0.05 | % @ Po = 4 W |
| Output Noise (eNo) | 35 to 50 | μV (A-weighted, Bw = 20 Hz to 20 kHz) |
| Supply Voltage Rejection (SVR) | 50 to 70 | dB @ f = 100 Hz; Vr = 1 Vrms |
| High Cut-off Frequency | 100 to 300 | kHz @ PO = 0.5 W |
| Input Impedance | 70 to 130 | kΩ |
| Cross Talk | 60 to 70 | dB @ f = 1 kHz, PO = 4 W |
| Standby Current Consumption | 10 to 20 | μA @ VSt-By = 0 to 1.2 V |
Key Features
- Multipower BCD technology
- MOSFET output power stage
- Excellent 2 Ω driving capability
- Hi-Fi class distortion performance
- Low output noise
- Standby and mute functions
- Automute at minimum supply voltage detection
- Low external component count:
- Internally fixed gain (26 dB)
- No external compensation
- No bootstrap capacitors
- Output DC offset detector
- Protections:
- Output short circuit to GND, to Vs, across the load
- Very inductive loads
- Overrating chip temperature with soft thermal limiter
- Load dump voltage
- Fortuitous open GND
- Reversed battery
- ESD protection
Applications
The TDA7851F is primarily designed for high-power car radio applications, offering superior performance and reliability in automotive audio systems. Its features make it suitable for a variety of high-power audio amplification needs in vehicles.
Q & A
- What is the maximum output power of the TDA7851F?
The TDA7851F can deliver up to 4 x 48 W of output power at 4 Ω load.
- What is the operating supply voltage range for the TDA7851F?
The operating supply voltage range is from 8 V to 18 V.
- What are the key protection features of the TDA7851F?
The TDA7851F includes protections such as output short circuit, overrating chip temperature, load dump voltage, fortuitous open GND, reversed battery, and ESD protection.
- Does the TDA7851F have standby and mute functions?
Yes, the TDA7851F includes standby and mute functions, which are CMOS-compatible.
- What is the thermal resistance junction-to-case for the TDA7851F?
The thermal resistance junction-to-case (Rth j-case) is 1 °C/W.
- What is the recommended minimum value for the SVR capacitor?
The minimum recommended value for the SVR capacitor is 10 μF.
- How does the TDA7851F handle high input signals?
The TDA7851F's inputs are ground-compatible and can handle very high input signals (±8 Vpk) without performance degradation.
- What is the typical standby current consumption of the TDA7851F?
The typical standby current consumption is 10 to 20 μA at VSt-By = 0 to 1.2 V.
- What package types are available for the TDA7851F?
The TDA7851F is available in Flexiwatt25 (vertical and horizontal) packages.
- Is the TDA7851F RoHS compliant?
Yes, the TDA7851F is RoHS compliant.
