Overview
The LM4950TSX/NOPB, produced by Texas Instruments, is a high-performance audio power amplifier designed for demanding applications in flat panel monitors, TVs, and other audio systems. This Boomer™ audio power amplifier series is capable of delivering 3.1 watts per channel into a 4Ω single-ended load or 7.5 watts into an 8Ω load in bridge-tied load (BTL) configuration, with minimal total harmonic distortion plus noise (THD+N). The LM4950 is known for its low power consumption, advanced pop and click noise elimination, and robust protection features such as short circuit and thermal shutdown protection.
Key Specifications
| Parameter | Conditions | Typical Value | Limit |
|---|---|---|---|
| Quiescent Power Supply Current | VIN = 0V, IO = 0A, No Load | 16 mA | 30 mA (max) |
| Shutdown Current | VSHUTDOWN = GND | 40 µA | 80 µA (max) |
| Output Power (SE) | VDD = 12V, RL = 4Ω, THD+N = 1% | 3.1 W | |
| Output Power (BTL) | VDD = 12V, RL = 8Ω, THD+N = 10% | 7.5 W | |
| Supply Voltage | 9.6V to 16V | ||
| Operating Temperature Range | -40°C to 85°C | ||
| Thermal Shutdown Temperature | 170°C (min), 190°C (max) |
Key Features
- Advanced pop and click noise elimination during turn-on and turn-off transitions.
- Low current, active-low shutdown mode.
- Low quiescent current.
- Unity-gain stable and external gain configuration capability.
- Short circuit protection and internal thermal shutdown mechanism.
- No requirement for bootstrap capacitors or snubber circuits.
- High power output with minimal external components.
Applications
- Flat panel monitors.
- Flat panel TVs.
- Computer sound cards.
- Other demanding audio applications requiring high power and minimal size.
Q & A
- What is the typical output power of the LM4950 in single-ended configuration? The LM4950 can deliver 3.1 watts per channel into a 4Ω single-ended load with less than 1% THD+N.
- What is the maximum output power in bridge-tied load (BTL) configuration? The LM4950 can deliver 7.5 watts into an 8Ω load in BTL configuration with less than 10% THD+N.
- What is the operating voltage range of the LM4950? The LM4950 operates over a power supply voltage range of 9.6V to 16V.
- Does the LM4950 require external bootstrap capacitors or snubber circuits? No, the LM4950 does not require bootstrap capacitors or snubber circuits.
- What protection features does the LM4950 have? The LM4950 features short circuit protection and internal thermal shutdown protection.
- How does the LM4950 eliminate pop and click noises? The LM4950 contains advanced pop and click circuitry that eliminates noises during turn-on and turn-off transitions.
- What is the typical quiescent power supply current of the LM4950? The typical quiescent power supply current is 16 mA.
- What is the shutdown current when the shutdown pin is grounded? The shutdown current is typically 40 µA.
- What is the thermal shutdown temperature range of the LM4950? The thermal shutdown temperature range is between 170°C and 190°C.
- In which applications is the LM4950 commonly used? The LM4950 is commonly used in flat panel monitors, TVs, and computer sound cards.
