Overview
The LM1875T/LF02 is a high-performance, monolithic audio power amplifier produced by Texas Instruments. This device is designed to deliver up to 30 watts of output power, making it suitable for a variety of consumer audio applications. It is known for its very low distortion and high quality performance, with a typical audio voltage output (AVO) of 90 dB. The LM1875T/LF02 operates in a Class-AB configuration, ensuring efficient power delivery while maintaining low distortion levels.
Key Specifications
| Parameter | Value | Units |
|---|---|---|
| Supply Voltage Range | 16 - 60 | V |
| Output Power (THD = 1%) | 20 W (into 4Ω or 8Ω load) | W |
| Total Harmonic Distortion (THD) | 0.015% at 1 kHz, 20 W | % |
| Power Bandwidth | 70 kHz | kHz |
| Input Bias Current | ±0.2 μA | μA |
| Supply Current (POUT = 0W) | 70 mA | mA |
| Operating Temperature Range | 0 to 70 | °C |
| Current Limit | 4 A | A |
| PSRR (Power Supply Rejection Ratio) | 95 dB | dB |
Key Features
- Low Distortion: The LM1875T/LF02 offers very low distortion, with a THD of 0.015% at 1 kHz and 20 W output.
- High Output Power: Capable of delivering up to 30 watts of output power into a 4Ω or 8Ω load.
- Wide Power Bandwidth: Operates with a power bandwidth of 70 kHz, ensuring high fidelity audio performance.
- Protection Features: Includes internal current limit and thermal shutdown protection to prevent device damage.
- Wide Supply Range: Can operate with supply voltages ranging from 16V to 60V.
- High Current Capability: Supports high current output up to 4 A.
Applications
The LM1875T/LF02 is suitable for various consumer audio applications, including:
- Home audio systems
- Professional audio equipment
- Public address systems
- Automotive audio systems
- Other high-fidelity audio applications requiring low distortion and high power output.
Q & A
- What is the maximum output power of the LM1875T/LF02?
The LM1875T/LF02 can deliver up to 30 watts of output power into a 4Ω or 8Ω load.
- What is the typical THD of the LM1875T/LF02 at 1 kHz and 20 W output?
The typical THD is 0.015% at 1 kHz and 20 W output.
- What is the power bandwidth of the LM1875T/LF02?
The power bandwidth is 70 kHz.
- What protection features does the LM1875T/LF02 have?
The device includes internal current limit and thermal shutdown protection.
- What is the operating temperature range of the LM1875T/LF02?
The operating temperature range is from 0°C to 70°C.
- What is the maximum supply voltage for the LM1875T/LF02?
The maximum supply voltage is 60V.
- What is the minimum load impedance for the LM1875T/LF02?
The minimum load impedance is 4Ω.
- Does the LM1875T/LF02 have built-in ESD protection?
No, the device has limited built-in ESD protection and requires careful handling to prevent electrostatic damage.
- How should the LM1875T/LF02 be mounted for optimal thermal performance?
The device should be mounted directly to a heat sink to maximize heat dissipation and prevent thermal shutdown.
- What are the key considerations for PCB layout when using the LM1875T/LF02?
Proper layout is crucial to prevent oscillation and distortion. Ground return paths should be separate and as short as possible, and power supply traces should be separated from input traces.
