Overview
The LM4952TS/NOPB is a dual audio power amplifier designed by Texas Instruments, primarily for demanding applications in flat panel monitors and TVs. This device is part of the Boomer™ Audio Power Amplifier Series and is capable of delivering 3.1 watts per channel to a 4Ω single-ended load with less than 1% Total Harmonic Distortion plus Noise (THD+N) when powered by a 12VDC power supply. It features an internal DC-controlled volume control, eliminating the need for external feedback resistors, and includes advanced pop & click circuitry to minimize noise during turn-on and turn-off transitions.
Key Specifications
| Parameter | Conditions | Typical Value | Limit |
|---|---|---|---|
| Quiescent Power Supply Current (IDD) | VIN = 0V, IO = 0A, No Load | 18 mA | 35 mA (max) |
| Shutdown Current (ISD) | VSHUTDOWN = GND | 55 µA | 85 µA (max) |
| Output Power (POUT) | VDD = 12V, RL = 4Ω, THD+N = 1% | 3.1 W | 2.8 W (min) |
| Output Power (POUT) | VDD = 12V, RL = 4Ω, THD+N = 10% | 3.8 W | |
| Total Harmonic Distortion + Noise (THD+N) | PO = 2.0 Wrms, f = 1kHz | 0.08 % | |
| Power Supply Rejection Ratio (PSRR) | VRIPPLE = 200mVp-p, f = 1kHz | 89 dB | 80 dB (min) |
| Thermal Shutdown Temperature (TSD) | 170 °C | ||
| Supply Voltage (VDD) | 9.6V to 16V | ||
| Operating Temperature Range | -40°C to 85°C |
Key Features
- Internal DC-controlled volume control allowing easy and variable gain adjustment.
- Advanced pop & click circuitry to eliminate noise during turn-on and turn-off transitions.
- Low current, active-low shutdown mode with a shutdown current of 55 µA (typical).
- Low quiescent current of 18 mA (typical).
- Short circuit protection and internal thermal shutdown protection.
- No requirement for bootstrap capacitors or snubber circuits, making it ideal for high power and minimal size applications.
Applications
- Flat panel monitors.
- Flat panel TVs.
- Computer sound cards.
- Other display applications requiring high power and minimal size.
Q & A
- What is the typical output power of the LM4952 at 12VDC and 4Ω load? The typical output power is 3.1 watts per channel at THD+N = 1% and 3.8 watts per channel at THD+N = 10%.
- What is the quiescent power supply current of the LM4952? The quiescent power supply current is typically 18 mA.
- Does the LM4952 have built-in volume control? Yes, it features an internal DC-controlled volume control.
- What is the shutdown current of the LM4952? The shutdown current is typically 55 µA.
- What protection mechanisms does the LM4952 include? It includes short circuit protection and internal thermal shutdown protection.
- What is the operating temperature range of the LM4952? The operating temperature range is -40°C to 85°C.
- What is the supply voltage range for the LM4952? The supply voltage range is 9.6V to 16V.
- Does the LM4952 require external feedback resistors? No, it does not require external feedback resistors due to its internal DC-controlled volume control.
- What type of noise reduction does the LM4952 feature? It features advanced pop & click circuitry to eliminate noise during turn-on and turn-off transitions.
- What are some common applications of the LM4952? Common applications include flat panel monitors, flat panel TVs, and computer sound cards.
