Overview
The TDA7851F, produced by STMicroelectronics, is a breakthrough MOSFET technology class AB audio power amplifier designed specifically for high-power car radio applications. It 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 references in the car-radio field with unparalleled distortion performance.
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) | 10 A (Non repetitive, t = 100 μs), 9 A (Repetitive, duty cycle 10% at f = 10 Hz) | A |
| Power Dissipation (Ptot) at Tcase = 70 °C | 85 | W |
| Junction Temperature (Tj) | 150 | °C |
| Storage Temperature (Tstg) | -55 to 150 | °C |
| Output Power (Po) at 4 Ω | 4 x 48 W (max), 4 x 28 W @ 14.4 V, 1 kHz, 10% | W |
| Output Power (Po) at 2 Ω | 4 x 72 W (max) | W |
| Distortion (THD) at Po = 4 W | 0.01 to 0.05% | % |
| Output Noise (eNo) A-Weighted | 35 to 50 μV (Bw = 20 Hz to 20 kHz) | μV |
| Input Impedance (Ri) | 70 to 100 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 function
- Mute function
- 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
Applications
The TDA7851F is specifically designed for high-power car radio applications. Its high output power capability, excellent distortion performance, and robust protection features make it an ideal choice for automotive audio systems.
Q & A
- What is the maximum output power of the TDA7851F at 4 Ω?
The maximum output power of the TDA7851F at 4 Ω is 4 x 48 W.
- What is the output power of the TDA7851F at 2 Ω?
The maximum output power of the TDA7851F at 2 Ω is 4 x 72 W.
- What is the typical distortion level of the TDA7851F?
The typical distortion level of the TDA7851F is 0.01 to 0.05% at Po = 4 W.
- Does the TDA7851F have built-in protection features?
- What is the standby current consumption of the TDA7851F?
The standby current consumption of the TDA7851F is 20 μA when VSt-By = 1.2 V and 10 μA when VSt-By = 0.
- What is the thermal resistance junction-to-case (Rth j-case) of the TDA7851F?
The thermal resistance junction-to-case (Rth j-case) of the TDA7851F is 1 °C/W.
- What is the input impedance of the TDA7851F?
The input impedance of the TDA7851F is 70 to 100 kΩ.
- Does the TDA7851F require external compensation or bootstrap capacitors?
No, the TDA7851F does not require external compensation or bootstrap capacitors due to its internally fixed gain and low external component count.
- What is the operating supply voltage range of the TDA7851F?
The operating supply voltage range of the TDA7851F is up to 18 V.
- What package types are available for the TDA7851F?
The TDA7851F is available in Flexiwatt25 (vertical and horizontal) packages.
