The LM48511 device integrates a boost converter with a high-efficiency Class D audio power amplifier to provide 3-W continuous power into an 8-Ω speaker when operating from a 5-V power supply.
When operating from a 3-V to 4-V power supply, the LM48511 can be configured to drive 1 to 2.5 W into an 8-Ω load with less than 1% distortion (THD+N). The Class D amplifier features a low-noise PWM architecture that eliminates the output filter, reducing external component count, board area consumption, system cost, and simplifying design. A selectable spread spectrum modulation scheme suppresses RF emissions, further reducing the need for output filters.
The switching regulator of the LM48511 is a current-mode boost converter operating at a fixed frequency of 1 MHz. Two selectable feedback networks allow the LM48511 regulator to dynamically switch between two different output voltages, improving efficiency by optimizing the amplifier’s supply voltage based on battery voltage and output power requirements.
The LM48511 is designed for use in portable devices, such as GPS, mobile phones, and MP3 players. The high, 80% efficiency at 5 V, extends battery life when compared to Boosted Class AB amplifiers. Independent regulator and amplifier shutdown controls optimize power savings by disabling the regulator when high-output power is not required.
The gain of the LM48511 is set by external resistors, which allows independent gain control from multiple sources by summing the signals. Output short circuit and thermal overload protection prevent the device from damage during fault conditions. Superior click and pop suppression eliminates audible transients during power-up and shutdown.
| Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | LM48511 3-W, Ultra-Low EMI, Filterless, Mono, Class D Audio Power Amplifier With Spread Spectrum datasheet (Rev. K) | PDF | HTML | 08 Oct 2019 |
| Application note | Guidelines for Measuring Audio Power Amplifier Performance (Rev. A) | 26 Aug 2019 | ||
| Application note | AN-1849 An Audio Amplifier Power Supply Design (Rev. C) | 27 Jun 2019 | ||
| Application note | AN-1737 Managing EMI in Class D Audio Applications (Rev. A) | 01 May 2013 | ||
| EVM User's guide | AN-1922 LM48511 Evaluation Board User's Guide (Rev. C) | 01 May 2013 | ||
| More literature | LM48511SQ Demo Board Description and Setup Instructions | 26 Jan 2012 |
For additional terms or required resources, click any title below to view the detail page where available.
This LM48511SQDB is an evaluation board designed to ease the evaluation and effort during the development of a circuit using the LM48511SQ. It is an easy to use stand-alone board that requires power and GND, an input signal and an output load.
| Package | Pins | Download |
|---|---|---|
| WQFN (NHZ) | 24 | View options |
Recommended products may have parameters, evaluation modules or reference designs related to this TI product.
Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.
If you have questions about quality, packaging or ordering TI products, see TI support.