Overview
The TDA7377A, produced by STMicroelectronics, is a class AB car radio amplifier that offers high power output and advanced protection features. This integrated circuit is designed to operate in either dual bridge or quad single-ended configurations, making it versatile for various car audio systems. The amplifier features an exclusive fully complementary structure of the output stage and internally fixed gain, ensuring high power performance with a minimal external component count. Although the product is no longer in manufacture, it remains a significant component in legacy car audio systems.
Key Specifications
| Parameter | Test Condition | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|
| Supply Voltage Range (VS) | 8 | 18 | V | ||
| Total Quiescent Drain Current (Id) | RL = ∞ | 150 | mA | ||
| Output Power (PO) | THD = 10%; RL = 4Ω; Bridge | 31 | W | ||
| Output Power (PO EIAJ) | VS = 13.7V; Bridge | 30 | W | ||
| Distortion (THD) | RL = 4Ω; Single Ended, PO = 0.1 to 4W | 0.02 | 0.3 | % | |
| Cross Talk (CT) | f = 1KHz Single Ended | 70 | dB | ||
| Input Impedance (RIN) | Single Ended | 20 | 30 | KΩ | |
| Voltage Gain (GV) | Single Ended | 19 | 21 | dB | |
| Stand-by Attenuation (ASB) | PO = 1W | 80 | 90 | dB | |
| ST-BY Current Consumption (ISB) | VST-BY = 0 to 1.5V | 100 | µA |
Key Features
- High Output Power Capability: Up to 2 x 35W max. at 4Ω in bridge configuration and 4 x 10W at 2Ω in quad single-ended configuration.
- Internally Fixed Gain: 26dB BTL, ensuring high power performance with minimal external components.
- Stand-by Function: CMOS compatible with no audible pop during stand-by operations.
- Diagnostics Facility: Detects clipping, thermal shutdown, output faults (short to GND, VS, and soft short at turn-on), and provides current sinking at pin 10 for fault indication.
- Protection Features: Includes AC/DC short circuit protection to GND, VS, and across the load, soft short at turn-on, thermal shutdown, load dump voltage surge, and ESD protection.
- Low Component Count: No bootstrap capacitors or Boucherot cells required.
Applications
The TDA7377A is primarily designed for car radio audio systems, offering a robust and reliable solution for both stereo and quad-channel audio configurations. Its high power output and advanced protection features make it suitable for a variety of automotive audio applications where reliability and performance are critical.
Q & A
- What is the maximum output power of the TDA7377A in bridge configuration?
Up to 2 x 35W max. at 4Ω.
- What are the key protection features of the TDA7377A?
Includes AC/DC short circuit protection, thermal shutdown, load dump voltage surge, and ESD protection.
- How does the diagnostics facility work in the TDA7377A?
The diagnostics facility detects clipping, thermal shutdown, and output faults, providing current sinking at pin 10 for fault indication.
- What is the stand-by current consumption of the TDA7377A?
100 µA when VST-BY = 0 to 1.5V.
- What is the recommended grounding configuration for the TDA7377A?
The power ground (P-GND) and signal ground (S-GND) leads should be connected together on the PCB-layout with reasonably low-resistance tracks.
- Is the TDA7377A still in production?
No, the TDA7377A is no longer manufactured.
- What are the typical applications of the TDA7377A?
Primarily designed for car radio audio systems in both stereo and quad-channel configurations.
- What is the operating supply voltage range of the TDA7377A?
8V to 18V.
- Does the TDA7377A have built-in clip detection?
Yes, it includes an on-board clip detector that simplifies gain compression operation.
- How does the thermal shutdown protection work in the TDA7377A?
The output will signal the proximity of the junction temperature to the shutdown threshold, typically starting ~10°C before the shutdown threshold is reached.
