Overview
The Texas Instruments LM4755TSX/NOPB is a stereo audio power amplifier designed for high-performance audio applications. This dual-channel amplifier is capable of delivering 11W per channel of continuous average output power to a 4Ω load or 7W per channel into an 8Ω load, using a single 24V supply at 10% THD+N. The LM4755TSX/NOPB features an integrated mute function, internal gain resistors, and minimal external component requirements, making it an economical and efficient solution for consumer electronic manufacturers.
Key Specifications
| Parameter | Conditions | Typical | Limit |
|---|---|---|---|
| Output Power (Continuous Average per Channel) | f = 1 kHz, THD+N = 10%, RL = 8Ω | 7 W | 7 W (min) |
| f = 1 kHz, THD+N = 10%, RL = 4Ω | 11 W | 10 W (min) | |
| Total Quiescent Power | Mute Off | 10 mA | 15 mA (max) |
| Supply Current | Mute On | 7 mA | 7 mA |
| Total Harmonic Distortion | f = 1 kHz, PO = 1 W/ch, RL = 8Ω | 0.08 % | |
| Output Swing | PO = 10W, RL = 8Ω | 15 V | |
| Channel Separation | f = 1 kHz, VO = 4 Vrms | 55 dB | |
| Power Supply Rejection Ratio | f = 120 Hz, VO = 1 mVrms | 50 dB | |
| Slew Rate | 2 V/µs | ||
| Input Impedance | 83 kΩ | ||
| Power Bandwidth | 3 dB BW at PO = 2.5W, RL = 8Ω | 65 kHz | |
| Supply Voltage Range | 9V to 40V | ||
| Package Type | TO-263-9 |
Key Features
- Delivers 11W per channel of continuous average output power to a 4Ω load or 7W per channel into an 8Ω load using a single 24V supply at 10% THD+N.
- Integrated mute function for easy control of output power.
- Internal gain resistors and minimal external component requirements for a very economical design solution.
- Single supply operation with a wide supply range of 9V to 40V.
- Internal current limiting and thermal protection for reliable operation.
- Compact 9-lead TO-263 package suitable for stereo TV and compact stereo applications.
- Low external component count, reducing the overall cost and complexity of the design.
Applications
- Stereo TVs and compact stereo systems.
- Consumer electronic devices requiring high-quality audio output.
- Audio equipment such as amplifiers, speakers, and sound systems.
- Automotive audio systems.
Q & A
- What is the output power of the LM4755TSX/NOPB? The LM4755TSX/NOPB delivers 11W per channel of continuous average output power to a 4Ω load or 7W per channel into an 8Ω load.
- What is the supply voltage range for the LM4755TSX/NOPB? The supply voltage range is from 9V to 40V.
- Does the LM4755TSX/NOPB have an integrated mute function? Yes, it has an integrated mute function.
- What is the package type of the LM4755TSX/NOPB? The package type is TO-263-9.
- What are the key features of the LM4755TSX/NOPB? Key features include internal gain resistors, minimal external components, single supply operation, and internal current limiting and thermal protection.
- What are the typical applications of the LM4755TSX/NOPB? Typical applications include stereo TVs, compact stereo systems, and other consumer electronic devices requiring high-quality audio output.
- How does the LM4755TSX/NOPB protect against thermal issues? It has internal current limiting and thermal protection.
- What is the total harmonic distortion (THD) of the LM4755TSX/NOPB? The THD is 0.08% at f = 1 kHz, PO = 1 W/ch, RL = 8Ω.
- What is the power bandwidth of the LM4755TSX/NOPB? The power bandwidth is 65 kHz at 3 dB BW at PO = 2.5W, RL = 8Ω.
- How does the LM4755TSX/NOPB prevent oscillations? The inputs should be AC terminated at all times to prevent high frequency oscillations. If the inputs are left floating, they should be terminated to ground with a resistance of 50 kΩ or less on the AC side of the input coupling capacitors.
