STMicroelectronics TDA7491MV13TR

Overview

TDA7491MV13TR from STMicroelectronics is a mono BTL Class-D audio amplifier IC designed for LCD TV and monitor audio output stages. It delivers 25 W continuous power into 6 Ω at 16 V supply with 10% THD, operates from 5–18 V single supply, achieves 90% efficiency, and supports filterless operation without external LC output filtering.

For engineers reviewing the TDA7491MV13TR datasheet, TDA7491MV13TR pinout, TDA7491MV13TR application, or TDA7491MV13TR equivalent, key selection considerations include its differential input architecture, four fixed gain settings (20–32 dB), integrated standby/mute control, thermal overload protection, and PowerSSO-36 EPD package with exposed pad for passive heatsinking.

Technical Context

The TDA7491MV13TR implements a closed-loop, unipolar PWM modulation scheme with internal oscillator (290–330 kHz) or external synchronization via SYNCLK pin. Its differential analog inputs reject common-mode noise, while the integrated 3.3 V regulators (VDDPW, VDDS, VSS) power signal and power-stage circuitry independently.

Protection logic includes overcurrent detection (3–5 A threshold), thermal shutdown at 150 °C junction temperature, undervoltage lockout (<4 V), and overvoltage protection (>19 V). Diagnostic output (DIAG) provides open-drain fault signaling for short-circuit, thermal, or overvoltage events.

Key Specifications

Pinout & Package

Package: PowerSSO-36 with exposed pad down (EPD), thermally enhanced for direct PCB copper area coupling. Requires minimum 9 cm² of inner-layer copper vias per ST recommendation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar mono Class-D audio amplifier applications.

Compared with TDA7491MV13TR, TDA7492M trades filterless simplicity for higher power but adds thermal and BOM complexity, while TPA3116D2 offers stereo integration at the cost of increased layout effort and reduced efficiency in mono use cases.

Availability

TDA7491MV13TR is available at Aetrix Electronics and suitable for LCD TV manufacturing, monitor OEM production, and commercial digital signage requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.

Supply support for TDA7491MV13TR 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, specializing in analog, power, and microcontroller solutions for automotive, industrial, and consumer markets.

The TDA7491MV13TR belongs to ST's high-efficiency Class-D audio amplifier product line, engineered specifically for space- and thermal-constrained visual display applications where filterless operation and integrated protection are mandatory.

FAQ

What is the minimum recommended PCB copper area for thermal management?

ST specifies a minimum 9 cm² copper area with thermal vias beneath the exposed pad for full 25 W operation at 85 °C ambient. This area must be connected to internal ground planes and avoid isolation gaps. Derating curves in Section 7.9 show 20 W is sustainable with 5 cm², but 9 cm² ensures margin across voltage and load variations.

Can the TDA7491MV13TR drive a 4 Ω speaker?

Yes - the datasheet confirms operation into 4 Ω loads with appropriate derating: at 16 V supply, maximum continuous output is 20 W (THD = 10%) and 16 W (THD = 1%). External LC filtering is recommended for 4 Ω to maintain EMI compliance, unlike the filterless 6–8 Ω configurations.

How does the DIAG pin indicate fault conditions?

The DIAG pin is an open-drain output that pulls low during thermal shutdown, overcurrent (IOCP > 5 A), overvoltage (>21 V), or undervoltage (<4 V). It remains high during normal operation and standby. No pull-up is required if monitored by a microcontroller with internal weak pull-up; otherwise, a 10 kΩ external resistor to 3.3 V is recommended.

Is external clock synchronization mandatory for stable operation?

No - the internal oscillator (290–330 kHz) ensures fully autonomous operation. SYNCLK is optional and used only when synchronizing multiple TDA7491MV13TR units (e.g., left/right channels) to suppress beat frequencies or align switching edges in multi-amplifier systems. Slave mode requires 250 kHz square wave with 50% duty cycle.