STMicroelectronics TDA7482BOARD

Overview

TDA7482BOARD from STMicroelectronics is an evaluation board for the TDA7482 - a 25W mono Class-D audio amplifier IC in Multiwatt15 package, designed for TV and home stereo applications with ±25V split supply, 87% efficiency at 18W/8Ω, and integrated ST-BY/MUTE control. It implements PWM output stage, bootstrap gate drive, and on-chip thermal/overcurrent protection.

For engineers reviewing the TDA7482BOARD datasheet, TDA7482BOARD pinout, TDA7482BOARD application, or TDA7482BOARD equivalent, this board enables rapid validation of Class-D amplifier performance, LC filter tuning (60µH + 470nF), standby/mute sequencing, and thermal behavior under real-world load conditions.

Technical Context

The TDA7482BOARD hosts the TDA7482 IC operating in fixed-frequency PWM mode (100–140 kHz), using external frequency-setting resistor (RF = 12 kΩ typical) and feedback integrating capacitor (C4 = 4.7 nF). The board implements full split-supply operation with separate signal and power ground paths, and includes dedicated bootstrap diode (D96AU538C) and LC output filter.

It supports dual-rail DC supply up to ±25V, delivers 25W into 8Ω at 10% THD, and integrates protection logic that triggers thermal shutdown at 150°C junction temperature and overcurrent limit at 3.5–5 A. Mute and standby functions are controlled via TTL-compatible voltage thresholds (V_MUTE = 1.8–2.5 V, V_ST-BY = 0.8 V).

Key Specifications

Availability

TDA7482BOARD is available at Aetrix Electronics and suitable for TV audio subsystems, home stereo amplifiers, and embedded audio reference designs requiring stable component supply and validated Class-D implementation.

Supply support for TDA7482BOARD includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, designing and manufacturing analog, MCU, power, and audio ICs for industrial, automotive, and consumer markets.

The TDA7482 belongs to ST's high-efficiency audio amplifier product line, engineered specifically for space-constrained, thermally sensitive TV and home audio applications demanding >85% efficiency and integrated protection.

FAQ

What is the purpose of the C5 capacitor on the TDA7482BOARD?

C5 (100 nF) is placed directly between pins 13 (+VCC POW) and 14 (–VCC POW) to provide local high-frequency decoupling for the power supply rails driving the output H-bridge. Its placement adjacent to the IC minimizes loop inductance and prevents switching noise from destabilizing the power domain, as explicitly required in Figure 4 of the datasheet.

Can the TDA7482BOARD drive a 4Ω speaker load?

Yes - the TDA7482BOARD supports 4Ω loads, delivering 25W at 10% THD with ±16V supply per Table 5. However, thermal management must be verified: maximum dissipated power rises to 3.8W at full output, requiring adequate PCB copper area and airflow per the thermal data (R_{th j-case} = 1.8–2.5°C/W).

How is the switching frequency set on this board?

Switching frequency is set by resistor R5 (150 Ω) connected to pin 6 (FREQ), per the formula F_SW = BF / R_F, where BF = 1.4×10⁹ Hz·Ω. With R5 = 150 Ω, nominal F_SW ≈ 9.3 MHz - but actual value is 100–140 kHz due to internal scaling; the board uses R5 = 150 Ω matching the test circuit in Figure 2.

Does the board include input filtering or only output filtering?

The TDA7482BOARD includes only output-side LC filtering (L1 = 60 µH, C14 = 470 nF) as shown in Figure 2. No input RC or EMI filtering is implemented - the input (pin 9) connects directly to source via series capacitor C2 (0.33 µF), leaving input filtering to the system designer based on source impedance and EMC requirements.