Overview
The LM1875T/LF03 is a monolithic power amplifier designed by Texas Instruments, offering high-quality performance for consumer audio applications. This 20-watt audio power amplifier is housed in a TO-220 package and is known for its low distortion and high gain. It operates with a minimum of external components and is internally compensated and stable for gains of 10 or greater. The device is suitable for various audio setups, including single and dual supply configurations, and it provides reliable performance with features such as internal current limit and thermal shutdown.
Key Specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Series | LM1875 |
| Part Number | LM1875T/LF03 |
| Package Type | TO-220 (NDH)-5 |
| Audio Input Type | Analog |
| Speaker Channels (Max) | 1 (Mono) |
| Power Stage Supply (Max) (V) | 60 |
| Power Stage Supply (Min) (V) | 16 |
| Load (Min) (Ω) | 4 |
| Output Power (W) | 20 |
| THD + N at 1 kHz (%) | 0.015 |
| Iq (typ) (mA) | 70 |
| Control Interface | Hardware |
| Closed/Open Loop | Open |
| Operating Temperature Range (°C) | 0 to 70 |
| PSRR (dB) | 95 |
Key Features
- Internal compensation and stability for gains of 10 or greater.
- Pulse width modulation up to 50 kHz.
- Excellent thermal performance and high current handling capability.
- Soft-start feature for inrush current limiting.
- Ripple rejection ratio of 92 dB.
- Efficient power conversion with low EMI.
- Device overload protection including internal current limit and thermal shutdown.
- High gain, fast slew rate, and wide power bandwidth.
- Large output voltage swing and high current capability.
- Wide supply range from 16V to 60V.
- Internal output protection diodes and thermal protection with parole circuit.
Applications
The LM1875T/LF03 is designed for various consumer audio applications, including home audio systems, car audio systems, and other electronic devices requiring high-quality audio amplification. It is particularly suitable for single supply operation and can deliver up to 20 watts into a 4 or 8 ohm load on ±25V supplies. With ±30V supplies, it can deliver over 30 watts of power.
Q & A
- What is the maximum output power of the LM1875T/LF03?
The LM1875T/LF03 can deliver up to 20 watts into a 4 or 8 ohm load on ±25V supplies, and over 30 watts with ±30V supplies.
- What is the operating temperature range of the LM1875T/LF03?
The operating temperature range is from 0°C to 70°C.
- What type of package does the LM1875T/LF03 come in?
The LM1875T/LF03 comes in a TO-220 (NDH)-5 package.
- Does the LM1875T/LF03 have built-in protection features?
Yes, it includes internal current limit and thermal shutdown for overload protection.
- What is the ripple rejection ratio of the LM1875T/LF03?
The ripple rejection ratio is 92 dB.
- Is the LM1875T/LF03 internally compensated?
Yes, it is internally compensated and stable for gains of 10 or greater.
- What is the typical quiescent current of the LM1875T/LF03?
The typical quiescent current (Iq) is 70 mA.
- What is the power supply rejection ratio (PSRR) of the LM1875T/LF03?
The PSRR is 95 dB.
- Can the LM1875T/LF03 operate on a single supply?
Yes, it can operate on both single and dual supply configurations.
- What is the total harmonic distortion plus noise (THD + N) at 1 kHz for the LM1875T/LF03?
The THD + N at 1 kHz is 0.015%.
