TPA701DR vs LM4809LDX/NOPB
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| Category | Linear - Amplifiers - Audio | Linear - Amplifiers - Audio |
| Manufacturer | Texas Instruments | Texas Instruments |
| Description | IC AMP CLASS AB MONO 700MW 8SOIC | IC AMP CLASS AB STER 105MW 8WSON |
| Package | Tape & Reel (TR) | Tape & Reel (TR) |
| Series | - | Boomer® |
| Type | Class AB | Class AB |
| Features | Short-Circuit and Thermal Protection, Shutdown | Depop, Shutdown, Thermal Protection |
| Voltage - Supply | 2.5V ~ 5.5V | 2V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |
| Package / Case | 8-SOIC (0.154\", 3.90mm Width) | 8-WFDFN Exposed Pad |
| Supplier Device Package | 8-SOIC | 8-WSON (2.5x2.5) |
| Output Type | 1-Channel (Mono) | Headphones, 2-Channel (Stereo) |
| Max Output Power x Channels @ Load | 700mW x 1 @ 8Ohm | 105mW x 2 @ 16Ohm |
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1. What is an audio amplifier and what does it do?
An audio amplifier is a device that amplifies an audio signal, such as music or speech, to a higher voltage or current level to drive speakers or headphones, ensuring that the sound remains clear and accurate when played at higher volumes.
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2. What is a Class D audio amplifier and what are its advantages?
Class D audio amplifiers work through Pulse Width Modulation (PWM) technology and have extremely high efficiency (typically up to 90% or higher), making them suitable for use in portable audio equipment or high-efficiency sound systems. It generates less heat because it reduces energy consumption.
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3. Does the audio amplifier need to match the impedance of the speakers?
Yes, the output impedance of the audio amplifier should match the impedance of the speaker. Typically speakers have an impedance of 4Ω, 8Ω or 16Ω. Matching the impedance ensures that the amplifier delivers maximum power and the best sound quality from the speaker.
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4. How can I improve the thermal performance of my audio amplifier?
Audio amplifiers generate heat when they operate, especially Class A and Class AB amplifiers. Ways to improve heat dissipation include using a larger heat sink, adding a fan, or using a more efficient Class D amplifier. A good thermal design will improve the performance and life of the amplifier.
