Overview
The LM1875T/LB05 is a monolithic power amplifier produced by Texas Instruments, designed to offer high-quality performance for consumer audio applications. This amplifier is known for its very low distortion levels and high power output capabilities. It can deliver up to 20 watts into a 4Ω or 8Ω load on ±25V supplies, and over 30 watts with ±30V supplies. The LM1875T/LB05 features advanced circuit techniques and processing to achieve low distortion even at high output power levels, making it suitable for a variety of high-performance audio systems.
Key Specifications
| Parameter | Conditions | Typical | Tested Limits | Units |
|---|---|---|---|---|
| Supply Voltage | 60V | V | ||
| Output Power | THD = 1% | 25 W | W | |
| THD | POUT = 20W, fo = 1 kHz | 0.015% | % | |
| THD | POUT = 20W, fo = 20 kHz | 0.05% | 0.4% | % |
| Offset Voltage | ±1 mV | ±15 mV | mV | |
| Input Bias Current | ±0.2 μA | ±2 μA | μA | |
| Gain-Bandwidth Product | fo = 20 kHz | 5.5 MHz | MHz | |
| Open Loop Gain | DC | 90 dB | dB | |
| PSRR | VCC, 1 kHz, 1 Vrms | 95 dB | 52 dB | dB |
| Max Slew Rate | 20W, 8Ω, 70 kHz BW | 8 V/μs | V/μs | |
| Current Limit | VOUT = VSUPPLY −10V | 4 A | 3 A | A |
Key Features
- Up to 30 watts output power with ±30V supplies
- Very low distortion: 0.015% at 1 kHz, 20 W
- Wide power bandwidth: 70 kHz
- Protection for AC and DC short circuits to ground
- Thermal protection with parole circuit
- High current capability: 4A
- Wide supply range: 16V-60V
- Internal output protection diodes
- High gain and fast slew rate
- Low noise and high ripple rejection (94 dB)
Applications
- High-performance audio systems
- Bridge amplifiers
- Stereo phonographs
- Servo amplifiers
- Instrument systems
Q & A
- What is the maximum output power of the LM1875T/LB05?
The LM1875T/LB05 can deliver up to 20 watts into a 4Ω or 8Ω load on ±25V supplies, and over 30 watts with ±30V supplies.
- What is the typical distortion level of the LM1875T/LB05?
The typical distortion level is 0.015% at 1 kHz, 20 W.
- What is the wide power bandwidth of the LM1875T/LB05?
The wide power bandwidth is 70 kHz.
- Does the LM1875T/LB05 have thermal protection?
- What is the current limit of the LM1875T/LB05?
The current limit is around 4A.
- What is the supply voltage range of the LM1875T/LB05?
The supply voltage range is 16V-60V.
- Does the LM1875T/LB05 require external components for operation?
No, it is designed to operate with a minimum of external components.
- What kind of protection does the LM1875T/LB05 have against short circuits?
The LM1875T/LB05 has protection for AC and DC short circuits to ground and internal output protection diodes.
- What is the typical slew rate of the LM1875T/LB05?
The typical slew rate is 8 V/μs at 20W, 8Ω, 70 kHz BW.
- What are some common applications of the LM1875T/LB05?
High-performance audio systems, bridge amplifiers, stereo phonographs, servo amplifiers, and instrument systems.
