Overview
The TDA1905 is a monolithic integrated circuit designed by STMicroelectronics, intended for use as a low-frequency power amplifier. It is packaged in a POWERDIP package, which offers high power dissipation and thermal efficiency. This amplifier is suitable for a wide range of applications, particularly in radio and TV sets, due to its muting facility, protection against chip overtemperature, very low noise, high supply voltage rejection, and low 'switch-on' noise.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage (Vs) | 4 to 30 | V |
| Output Peak Current (non-repetitive) | 3 | A |
| Output Peak Current (repetitive) | 2.5 | A |
| Input Voltage (Vi) | 0 to + Vs | V |
| Differential Input Voltage | ± 7 | V |
| Power Dissipation at Tamb = 80°C | 1 W (Tcase = 60°C), 6 W | W |
| Storage and Junction Temperature | -40 to 150 | °C |
| Thermal Resistance Junction-Pins | 15 | °C/W |
| Thermal Resistance Junction-Ambient | 70 | °C/W |
| Output Power (Po) at 10% distortion | Up to 5.5 W (depending on Vs and RL) | W |
| Harmonic Distortion | 0.1% | % |
| Input Sensitivity | 37 to 100 mV (depending on Vs and RL) | mV |
| Supply Voltage Rejection | 40 to 50 dB | dB |
| Thermal Shut-Down Temperature | 115 °C | °C |
Key Features
- Muting facility with adjustable threshold voltage.
- Protection against chip overtemperature.
- Very low noise and high supply voltage rejection.
- Low 'switch-on' noise.
- Wide supply voltage range from 4V to 30V.
- High power dissipation up to 6W in the POWERDIP package.
- Thermal shut-down to prevent device damage due to high junction temperature.
- Variable impedance capability at pin 5 for different frequency responses.
Applications
The TDA1905 is primarily used in audio amplification applications, particularly in radio and TV sets. It is also suitable for other low-frequency power amplification needs where muting and thermal protection are essential. Additional applications include:
- Audio equipment requiring low noise and high supply voltage rejection.
- Systems needing temporary inhibition of the output signal, such as during switch-on or receiver tuning.
- Low-cost audio circuits without bootstrap configurations.
- Tone control circuits using the muting function.
Q & A
- What is the TDA1905 used for? The TDA1905 is used as a low-frequency power amplifier, particularly in radio and TV sets, and other audio equipment.
- What is the supply voltage range of the TDA1905? The supply voltage range is from 4V to 30V.
- What is the maximum output power of the TDA1905? The maximum output power is up to 5.5W, depending on the supply voltage and load resistance.
- Does the TDA1905 have a muting function? Yes, it has a muting facility with adjustable threshold voltage.
- What is the thermal shut-down temperature of the TDA1905? The thermal shut-down temperature is 115°C.
- What is the thermal resistance of the POWERDIP package? The thermal resistance junction-pins is 15°C/W and junction-ambient is 70°C/W.
- How does the muting function work? The muting function works by applying a DC voltage to pin 4, which inhibits the output signal.
- What are the key features of the TDA1905? Key features include muting facility, protection against chip overtemperature, very low noise, high supply voltage rejection, and low 'switch-on' noise.
- What are some common applications of the TDA1905? Common applications include radio and TV sets, audio equipment, and systems requiring temporary inhibition of the output signal.
- What is the input sensitivity of the TDA1905? The input sensitivity ranges from 37 to 100 mV, depending on the supply voltage and load resistance.
