Overview
The TDA7391 is a bridge class AB audio power amplifier designed by STMicroelectronics, specifically intended for high-power car radio applications. This amplifier is known for its high power capability and versatility, allowing it to operate in both differential and single-ended input modes. The TDA7391 is suitable for use in boosters and high-end car radio equipment due to its fully complementary output stage and internal fixed gain configuration, which reduces the need for external components.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| DC Supply Voltage (VS) | 8 - 18 | V |
| Operating Supply Voltage (VOP) | 18 | V |
| Peak Supply Voltage (VPEAK) | 50 | V (t = 50 ms) |
| Output Peak Current (Repetitive) | 4.5 | A (f > 10 Hz) |
| Output Peak Current (Non-Repetitive) | 6 | A |
| Power Dissipation (Tcase = 85 °C) | 43 | W |
| Storage and Junction Temperature | -40 to 150 | °C |
| Operative Ambient Temperature Range | -40 to 105 | °C |
| Output Power (RL = 4 Ω, d = 10%) | 26 | W |
| Output Power (RL = 3.2 Ω, d = 10%) | 32 | W |
| Distortion (PO = 0.1 to 15 W) | 0.06 | % |
| Voltage Gain | 29.5 - 30.5 | dB |
| High Frequency Roll-off (PO = 1W, -3dB) | 75 | kHz |
| Input Impedance (Differential) | 36 - 60 | kΩ |
| Input Impedance (Single Ended) | 30 - 55 | kΩ |
| Input Noise Voltage | 4 | mV (Rg = 0 Ω, f = 22 Hz to 22 kHz) |
| Common Mode Rejection Ratio | 65 | dB (f = 1 kHz, VIN = 1 Vrms) |
Key Features
- High Power Capability: Up to 35 W/4 Ω EIAJ and 45 W/3.2 Ω max.
- Differential Inputs: Accepts both single-ended and differential input signals.
- Minimum External Component Count: No bootstrap capacitors, Boucherot cells, or SVR capacitors required. Internally fixed gain (30 dB).
- Standby Function: CMOS compatible with low standby current (in the range of few μA).
- Programmable Turn-on/Off Delay: Adjustable using external components.
- No Audible Pop: During mute and standby operations.
- Protections: Short circuit, very inductive loads, chip over temperature, load dump, open GND, and ESD protection.
- Clipping Detection: On-board clipping detector for easy implementation of gain compression systems.
Applications
The TDA7391 is primarily designed for high-power car radio applications, including boosters and high-end car radio equipment. Its high power capability and robust protection features make it suitable for demanding automotive audio systems.
Q & A
- What is the maximum output power of the TDA7391?
The TDA7391 can deliver up to 35 W/4 Ω EIAJ and 45 W/3.2 Ω max.
- What types of input signals can the TDA7391 accept?
The TDA7391 can accept both single-ended and differential input signals.
- Does the TDA7391 require external bootstrap capacitors or Boucherot cells?
No, the TDA7391 does not require external bootstrap capacitors or Boucherot cells.
- What is the standby current of the TDA7391?
The standby current of the TDA7391 is in the range of a few μA.
- How can the turn-on/off delay be programmed in the TDA7391?
The turn-on/off delay can be programmed using external components connected to the SYNC and MUTE pins.
- Does the TDA7391 have any protection features?
Yes, the TDA7391 includes protections against short circuits, very inductive loads, chip over temperature, load dump, open GND, and ESD.
- What is the purpose of the clipping detection feature in the TDA7391?
The clipping detection feature allows for the easy implementation of gain compression systems.
- What is the thermal resistance junction to case for the TDA7391?
The thermal resistance junction to case for the TDA7391 is a maximum of 1.8 °C/W.
- What is the operative ambient temperature range for the TDA7391?
The operative ambient temperature range for the TDA7391 is -40 to 105 °C.
- What is the typical voltage gain of the TDA7391?
The typical voltage gain of the TDA7391 is 30 dB.
