Overview
The TDA7388 is an AB class audio power amplifier designed and manufactured by STMicroelectronics. It is packaged in the Flexiwatt 25 format and is specifically tailored for high-end car radio applications. The amplifier is based on a fully complementary PNP/NPN configuration, which allows for a rail-to-rail output voltage swing without the need for bootstrap capacitors. This design feature, along with the extremely reduced boundary components count, enables the creation of very compact sets.
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 (t = 50 ms) |
| Output Peak Current (Repetitive) | 4.5 | A (duty cycle 10% at f = 10 Hz) |
| Output Peak Current (Non-Repetitive) | 5.5 | A (t = 100 µs) |
| Power Dissipation (Tcase = 70 °C) | 80 | W |
| Junction Temperature (Tj) | 150 | °C |
| Storage Temperature (Tstg) | -55 to 150 | °C |
| Thermal Resistance Junction-to-Case (Rth j-case) | 1 | °C/W |
| Output Power (4 Ω, 1 kHz, 10%) | 4 x 26 W | - |
| Output Power (4 Ω, max.) | 4 x 45 W | - |
Key Features
- High output power capability: 4 x 45 W / 4 Ω max., 4 x 26 W / 4 Ω @ 14.4 V, 1 kHz, 10%
- Low distortion and low output noise
- Standby function and mute function
- Automute at minimum supply voltage detection
- Low external component count: internally fixed gain (26 dB), no external compensation, no bootstrap capacitors
- Protections: output short circuit to ground, 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 TDA7388 is primarily designed for high-end car radio applications. However, it can also be used in other projects requiring a quad bridge amplifier, such as portable speakers, portable DVD players, and game machines.
Q & A
- What is the TDA7388?
The TDA7388 is an AB class audio power amplifier designed for high-end car radio applications, packaged in Flexiwatt 25.
- What are the key output power specifications of the TDA7388?
The TDA7388 can deliver up to 4 x 45 W / 4 Ω max. and 4 x 26 W / 4 Ω @ 14.4 V, 1 kHz, 10%.
- What are the protection features of the TDA7388?
The TDA7388 includes protections such as output short circuit to ground, to VS, across the load, very inductive loads, overrating chip temperature with soft thermal limiter, load dump voltage, fortuitous open GND, reversed battery, and ESD.
- What is the significance of the reduced boundary components count in the TDA7388?
The reduced boundary components count allows for very compact sets and simplifies the design by eliminating the need for external compensation and bootstrap capacitors.
- How does the TDA7388 handle standby and mute functions?
The TDA7388 has standby and mute functions that can be controlled directly by connecting the respective pins to the supply voltage. Conventional/low-power transistors can be used to drive these functions in the absence of true CMOS ports or microprocessors.
- What is the role of the SVR capacitor in the TDA7388 circuit?
The SVR capacitor governs the turn ON/OFF time sequence and is essential for ripple rejection and pop optimization during ON/OFF transients. The minimum recommended value is 10 µF.
- What are the thermal specifications of the TDA7388?
The TDA7388 has a junction temperature limit of 150 °C and a thermal resistance junction-to-case of 1 °C/W. The storage temperature range is -55 to 150 °C.
- Can the TDA7388 be used in applications other than car radios?
Yes, the TDA7388 can be used in other projects requiring a quad bridge amplifier, such as portable speakers, portable DVD players, and game machines.
- What package is the TDA7388 available in?
The TDA7388 is available in the Flexiwatt 25 package.
- How does the TDA7388 handle input signals?
The TDA7388’s inputs are ground-compatible and can handle very high input signals (±8 Vpk) without performance degradation.
