Overview
The TDA7491HV is a dual BTL (Bridge-Tied Load) class-D audio amplifier designed by STMicroelectronics. It is specifically tailored for use in LCD TVs and monitors. This amplifier features high efficiency and is available in both exposed-pad-up (EPU) and exposed-pad-down (EPD) packages, eliminating the need for a separate heatsink. The TDA7491HV is pin-to-pin compatible with the TDA7491P and TDA7491LP, making it a versatile choice for various audio applications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Output Power (THD = 10%) | 20 W + 20 W | W |
| Output Power (THD = 1%) | 16 W + 16 W | W |
| Supply Voltage Range | 5 V - 18 V | V |
| Efficiency | 80% - 90% | % |
| Closed-Loop Gain Settings | 20 dB, 26 dB, 30 dB, 32 dB | dB |
| Total Harmonic Distortion (THD) at 1 W | 0.1% | % |
| Operating Temperature Range | -40°C to 85°C | °C |
| Switching Frequency | 290 kHz - 350 kHz | kHz |
| Package Type | PowerSSO-36 EPU/EPD |
Key Features
- High efficiency (η = 90%) reducing heat generation and power consumption.
- Wide-range single-supply operation from 5 V to 18 V.
- Four selectable, fixed gain settings of nominally 20 dB, 26 dB, 30 dB, and 32 dB.
- Differential inputs to minimize common-mode noise.
- No ‘pop’ at turn-on/off, ensuring smooth operation.
- Standby and mute features for power management.
- Short-circuit protection and thermal overload protection for reliability.
- Externally synchronizable for flexible system integration.
Applications
The TDA7491HV is primarily designed for use in LCD TVs and monitors, but its versatility and high performance also make it suitable for other audio applications such as:
- Home audio systems
- Professional audio equipment
- Automotive audio systems
- Portable audio devices
Q & A
- What is the maximum output power of the TDA7491HV?
The TDA7491HV can deliver up to 20 W + 20 W continuous output power at THD = 10% with a load of 8 Ω and VCC = 18 V.
- What is the operating temperature range of the TDA7491HV?
The operating temperature range is from -40°C to 85°C.
- What are the available gain settings for the TDA7491HV?
The amplifier offers four selectable, fixed gain settings of nominally 20 dB, 26 dB, 30 dB, and 32 dB.
- Does the TDA7491HV require a separate heatsink?
No, due to its high efficiency and the use of exposed-pad-up (EPU) and exposed-pad-down (EPD) packages, no separate heatsink is required.
- What protection features does the TDA7491HV have?
The amplifier includes undervoltage protection, overcurrent protection, and thermal overload protection.
- Can the TDA7491HV be externally synchronized?
- What is the switching frequency range of the TDA7491HV?
The switching frequency range is from 290 kHz to 350 kHz.
- What package types are available for the TDA7491HV?
The TDA7491HV is available in PowerSSO-36 EPU (exposed-pad-up) and EPD (exposed-pad-down) packages.
- Is the TDA7491HV pin-to-pin compatible with other models?
- How does the TDA7491HV handle turn-on and turn-off?
The amplifier is designed to have no ‘pop’ at turn-on or turn-off.
