Overview
The TDA7391LV, produced by STMicroelectronics, is a bridge class AB audio power amplifier specifically designed for high-power car radio applications. This amplifier is notable for its high power capability, low voltage operation, and comprehensive protection features. It is suitable for high-end car radio equipment due to its ability to operate in both differential and single-ended input modes. The TDA7391LV is compliant with recent OEM specifications for low voltage operation, including 'start-stop' battery profiles and e-call functions.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| DC Supply Voltage (VS) | 6 - 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 (Ptot) | 43 | W (Tcase = 85 °C) |
| Storage and Junction Temperature (Tstg, Tj) | -40 to 150 | °C |
| Thermal Resistance Junction-to-Case (Rth j-case) | 1.8 | °C/W |
| Total Quiescent Current (Iq) | 60 - 150 | mA |
| Output Offset Voltage (VOS) | -120 | mV |
| Standby Current (ISB) | 50 | μA (VST-BY = 1.5 V) |
| Output Power (PO) at THD = 10% and RL = 4 Ω | 26 | W |
| Output Power (PO) at THD = 10% and RL = 3.2 Ω | 32 | W |
| Maximum Output Power (PO MAX) at VS = 14.4 V and RL = 3.2 Ω | 45 | W |
| Total Harmonic Distortion (THD) | 0.06 | % |
| Voltage Gain (GV) | 29.5 - 30.5 | dB |
| High Frequency Roll-off (fH) | 75 | kHz (PO = 1 W; -3 dB) |
| Input Impedance (RIN) | 36 - 60 kΩ (Differential), 30 - 55 kΩ (Single-ended) | kΩ |
| Input Noise Voltage (EIN) | 4 | mV (Rg = 0 Ω; f = 22 Hz to 22 kHz) |
| Input Common Mode Rejection (CMRR) | 65 | dB (f = 1 kHz; VIN = 1 Vrms) |
| Supply Voltage Rejection (SVR) | 60 | dB (Rg = 0 Ω; Vr = 1 Vrms) |
| Clipping Detection Level (CDL) | 5 - 15 | % |
| Absolute Thermal Shutdown Junction Temperature (Tsd) | 160 | °C |
Key Features
- High Power Capability: Up to 40 W into 4 Ω and 45 W into 3.2 Ω loads.
- Differential and Single-Ended Inputs: The amplifier can operate with either differential or single-ended input signals.
- Minimum External Component Count: The internal fixed gain configuration and fully complementary output stage reduce the need for external components.
- Standby Function: The device features a standby mode that shuts down internal bias supplies, reducing current consumption to a few μA.
- Low Voltage Operation: Compatible with 'start-stop' battery profiles and e-call functions, allowing operation down to 6/7 V.
- Comprehensive Protections: Includes protections against short circuits, very inductive loads, chip overtemperature, load dump, open GND, and ESD.
- Clipping Detection: On-board clipping detector provides a low-level signal during clipping, facilitating gain compression systems.
- Mute Function: Automatic mute during turn-on and turn-off to prevent noisy transients.
Applications
The TDA7391LV is primarily designed for high-power car radio applications, particularly in high-end automotive audio systems. Its features make it suitable for:
- Car radio amplifiers requiring high power output and low distortion.
- Systems that need to comply with recent OEM specifications for low voltage operation.
- Applications requiring robust protection against various fault conditions.
Q & A
- What is the maximum output power of the TDA7391LV?
The maximum output power is up to 45 W into a 3.2 Ω load at VS = 14.4 V and THD = 10%.
- What are the input modes supported by the TDA7391LV?
The amplifier supports both differential and single-ended input modes.
- What is the standby current consumption of the TDA7391LV?
The standby current is in the range of a few μA when the standby pin is low.
- Does the TDA7391LV have built-in protection features?
Yes, it includes protections against short circuits, very inductive loads, chip overtemperature, load dump, open GND, and ESD.
- What is the minimum operating voltage for the TDA7391LV?
The minimum operating voltage is 6 V, making it compatible with 'start-stop' battery profiles.
- How does the clipping detection feature work?
The on-board clipping detector provides a low-level signal during clipping, which can be used to implement gain compression systems.
- What is the thermal shutdown temperature for the TDA7391LV?
The absolute thermal shutdown junction temperature is 160 °C.
- What is the input impedance of the TDA7391LV?
The input impedance is 36 - 60 kΩ for differential inputs and 30 - 55 kΩ for single-ended inputs.
- Does the TDA7391LV require external compensation?
No, the amplifier does not require external compensation due to its internal fixed gain configuration and fully complementary output stage.
- What is the high frequency roll-off of the TDA7391LV?
The high frequency roll-off is 75 kHz at PO = 1 W and -3 dB.
