TDA2050 High Power 32W Mono Audio Amplifier IC TO-220

TDA2050 High Power 32W Mono Audio Amplifier IC TO-220 is a monolithic integrated circuit designed for use as a high-fidelity Class AB audio power amplifier. This robust IC delivers an impressive 32 W of output power into a $4 \Omega$ load, making it a reliable choice for driving high-power speakers in various audio setups. The TDA2050 operates efficiently from either a split (dual) or single power supply, offering great flexibility during circuit design. Furthermore, its low harmonic and crossover distortion ensures excellent audio quality across the entire frequency range. The chip integrates sophisticated protection features, including short-circuit protection and thermal shutdown. Consequently, this IC provides a durable and powerful solution for quality stereo systems, active speakers, and high-end industrial audio applications.

Key Features:

• High Output Power: Capable of delivering up to 32 W of continuous power into a $4 \Omega$ load at $\pm$25 V supply voltage.
• Wide Operating Voltage: Supports a broad supply range, functioning effectively with single supplies up to 50 V or split supplies up to $\pm$25 V.
• Low Distortion: Exhibits very low Total Harmonic Distortion (THD) and intermodulation distortion, ensuring high-fidelity audio reproduction.
• Integrated Protection: Includes comprehensive thermal shutdown and robust short-circuit protection against accidental output shorts to ground or supply rails.
• Muting Function: Features a dedicated mute/standby function that simplifies integration with microcontrollers and power management systems.

Technical Specifications:

• Maximum Output Power (P_out): 32 W (into 4 Ω at $\pm$25 V)
• Total Supply Voltage (V_S): Up to 50 V (Single Supply) or $\pm$25 V (Split Supply)
• Minimum Load Impedance: 4 Ω
• Total Harmonic Distortion (THD): Typically 0.05% (at 18 W, 4 Ω)
• Gain Bandwidth Product (GBW): 3.5 MHz (Ensures fast response)
• Input Noise Voltage: Very low, contributing to clean audio output.
• Operating Temperature Range (T_j): −40°C to +150°C

Mechanical Specifications:

• Package Type: Pentawatt (5-Pin TO-220)
• Mounting: Through-Hole Technology (THT)
• Heatsink Tab: The metal tab is internally connected to the negative supply rail (V_S− or pin 3). Therefore, proper electrical isolation is necessary if mounting to a grounded heatsink.

Dimensions:

• Body Length (Heatsink Tab): ≈ 15.6 mm
• Body Width: ≈ 10.4 mm
• Pin Pitch: 2.54 mm (Standard)
• Lead Length: ≈ 13 mm
• Mounting Hole Diameter: ≈ 3.8 mm (For screw or bolt mounting to a heatsink)

Pinout and Wiring:

• Pin 1 (Non-Inverting Input): Connect the audio signal source to this positive input.
• Pin 2 (Inverting Input): Connect feedback components from the output to this pin to set the voltage gain.
• Pin 3 (Negative Supply V_S−): Connect to the negative DC supply voltage (e.g., −18 V). This pin is internally connected to the heatsink tab.
• Pin 4 (Output): Connect this pin directly to the loudspeaker (via a DC decoupling capacitor for single supply).
• Pin 5 (Positive Supply V_S+): Connect to the positive DC supply voltage (e.g., +18 V).

Datasheet Reference:

• Download STMicroelectronics TDA2050 Datasheet

Commonly Used in:

• DIY Amplifier Projects: A popular choice among hobbyists for building simple, yet powerful, mono or stereo amplifiers.
• Computer Multimedia Speakers: Used frequently in active 2.1 speaker systems (often driving the subwoofer channel).
• Professional Audio Gear: Integrated into low-to-mid power studio monitors and guitar practice amplifiers.

Applications:

• High-Fidelity Stereo Systems: Designers configure two TDA2050s to create a powerful stereo amplifier stage.
• Subwoofer Drivers: Its high power and low distortion characteristics make it ideal for driving single woofer cones.
• Bridged Amplifiers (BTL): You can use two ICs in a BTL configuration to nearly quadruple the output power into a single load, however, the supply voltage must be adjusted accordingly.

Equivalent Models:

• LM1875 (Texas Instruments): A 20W amplifier IC in a similar TO-220 package, often considered a slightly lower-power alternative with similar audio quality.
• TDA2030A (STMicroelectronics): A lower power (18W) sibling in the same family, often interchangeable in circuits requiring less power.
• LA4440 (Sanyo/ON Semi): A popular dual-channel IC used in automotive audio, which can sometimes serve as an alternative in dual-supply applications.

Package Includes:

• 1 x TDA2050 High Power 32W Mono Audio Amplifier IC TO-220