LM4844TL/NOPB vs LM48555TL/NOPB
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| Category | Linear - Amplifiers - Audio | Linear - Amplifiers - Audio |
| Manufacturer | Texas Instruments | Texas Instruments |
| Description | IC AMP CLSS AB STER 1.2W 30DSBGA | IC AMP CLASS AB MONO 12USMD |
| Package | Bulk | Tape & Reel (TR) |
| Series | Boomer® | Boomer® |
| Type | Class AB | Class AB |
| Features | 3D, Depop, I²C, Mute, Shutdown, Volume Control | Depop, Differential Inputs, Shutdown |
| Voltage - Supply | 2.7V ~ 5.5V | 2.7V ~ 9V |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |
| Package / Case | 30-WFBGA, DSBGA | 12-WFBGA |
| Supplier Device Package | 30-DSBGA | 12-uSMD (1.46x1.97) |
| Output Type | 2-Channel (Stereo) with Stereo Headphones | 1-Channel (Mono) |
| Max Output Power x Channels @ Load | 1.2W x 2 @ 8Ohm; 80mW x 2 @ 32Ohm | - |
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1. What is a power amplifier and how is it different from an audio amplifier?
A power amplifier is a type of audio amplifier designed to drive high-power loads such as speakers. It is capable of amplifying audio signals to a sufficient power output to drive speakers to produce greater volume.
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2. 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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3. 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.
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4. What should the frequency response range of an audio amplifier be?
The frequency response range of a good quality audio amplifier is usually between 20Hz and 20kHz, which is the typical frequency range that the human ear can hear. A wider frequency response ensures that the audio amplifier can accurately reproduce both low and high frequency details.
