Overview
The TDA7391PD, specifically the TDA7391PD13TR, is a bridge class AB audio power amplifier designed by STMicroelectronics. This amplifier is particularly suited for high-power car radio applications, offering a high power capability and the flexibility to operate with either differential or single-ended input signals. The device features a fully complementary output stage, which minimizes the need for external components and enhances its suitability for boosters and high-end car radio equipment.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| DC Supply Voltage (VS) | 8 - 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 |
| Total Quiescent Current (Iq) | 60 - 150 | mA |
| Output Offset Voltage (VOS) | -120 | mV |
| Standby Current (ISB) | 100 | μA (VST-BY = 1.5 V) |
| Standby Input Bias Current (ISBin) | 10 | μA (VST-BY = 5 V) |
| Standby On Threshold Voltage (VSBon) | 1.5 | V |
| Standby Off Threshold Voltage (VSBoff) | 3.5 | V |
| Output Power (PO) @ RL = 3.2 Ω | 32 | W (d = 10%) |
| Output Power (PO) @ RL = 4 Ω | 26 | W (d = 10%) |
| Distortion (d) | 0.06 | % (PO = 0.1 to 15 W) |
| Voltage Gain (GV) | 29.5 - 30.5 | dB |
| High Frequency Rolloff (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) |
| Common Mode Rejection Ratio (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) | 10 | % |
| Absolute Thermal Shutdown Junction Temperature (Tsd) | 160 | °C |
Key Features
- High power capability: Up to 32 W @ 3.2 Ω and 26 W @ 4 Ω with a supply voltage of 14.4 V.
- Differential inputs: Accepts both single-ended and differential input signals.
- Minimum external component count: No bootstrap capacitors, Boucherot cells, or SVR capacitor required.
- Internally fixed gain: 30 dB gain without the need for external components.
- Standby function: CMOS compatible with programmable turn-on/off delay.
- No audible pop during mute and standby operations.
- Comprehensive protection features: Short circuit, very inductive loads, chip over temperature, load dump, open GND, and ESD protection.
- On-board clipping detector: Allows for easy implementation of gain compression systems.
Applications
The TDA7391PD is specifically designed for high-power car radio applications, including boosters and high-end car radio equipment. Its robust features and protections make it suitable for demanding automotive audio systems.
Q & A
- What is the maximum output power of the TDA7391PD at 3.2 Ω load?
The maximum output power is 32 W at 3.2 Ω load with a supply voltage of 14.4 V and a distortion of 10%. - What types of input signals can the TDA7391PD accept?
The TDA7391PD can accept both single-ended and differential input signals. - Does the TDA7391PD require external bootstrap capacitors or Boucherot cells?
No, the TDA7391PD does not require external bootstrap capacitors or Boucherot cells. - What is the typical voltage gain of the TDA7391PD?
The typical voltage gain is 30 dB. - Does the TDA7391PD have a standby function?
Yes, the TDA7391PD has a CMOS compatible standby function with programmable turn-on/off delay. - What protections does the TDA7391PD offer?
The TDA7391PD offers protections against short circuits, very inductive loads, chip over temperature, load dump, open GND, and ESD. - How does the TDA7391PD handle clipping detection?
The TDA7391PD has an on-board clipping detector that provides a low-level signal during clipping (distortion = 10%). - What is the thermal shutdown junction temperature of the TDA7391PD?
The absolute thermal shutdown junction temperature is 160°C. - What is the input impedance of the TDA7391PD?
The input impedance is 36 - 60 kΩ for differential inputs and 30 - 55 kΩ for single-ended inputs. - What is the common mode rejection ratio (CMRR) of the TDA7391PD?
The CMRR is 65 dB at 1 kHz with a VIN of 1 Vrms.
