LM48511
- 3-W Output into 8 Ω at 5 V With THD+N = 1%
- Selectable spread spectrum mode reduces EMI
- 80% Efficiency
- Independent regulator and amplifier shutdown controls
- Dynamically Selectable Regulator Output Voltages
- Filterless Class D
- 3-V to 5.5-V Operation
- Low shutdown current
- Click and pop suppression
- Key specifications
- Quiescent power supply current
- VDD = 3 V 9 mA (Typical)
- VDD = 5 V 13.5 mA (Typical)
- PO at VDD = 5 V, PV1 = 7.8 V, RL = 8 Ω,
THD+N = 1% 3 W (Typical) - PO at VDD = 3 V, PV1 = 4.8 V, RL = 8 Ω,
THD+N = 1% 1 W (Typical) - PO at VDD = 5 V, PV1 = 7.8 V, RL = 4 Ω,
THD+N = 1% 5.4 W (Typical) - Shutdown Current at VDD = 3 V, 0.01 µA (Typical)
- Quiescent power supply current
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.
技術文件
| 類型 | 標題 | 日期 | ||
|---|---|---|---|---|
| * | Data sheet | LM48511 3-W, Ultra-Low EMI, Filterless, Mono, Class D Audio Power Amplifier With Spread Spectrum datasheet (Rev. K) | PDF | HTML | 2019年 10月 8日 |
| Application note | Guidelines for Measuring Audio Power Amplifier Performance (Rev. A) | 2019年 8月 26日 | ||
| Application note | AN-1849 An Audio Amplifier Power Supply Design (Rev. C) | 2019年 6月 27日 | ||
| Application note | AN-1737 Managing EMI in Class D Audio Applications (Rev. A) | 2013年 5月 1日 | ||
| EVM User's guide | AN-1922 LM48511 Evaluation Board User's Guide (Rev. C) | 2013年 5月 1日 | ||
| More literature | LM48511SQ Demo Board Description and Setup Instructions | 2012年 1月 26日 |
設計與開發
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LM48511SQBD — LM48511 整合了高效率升壓轉換器
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.
PSPICE-FOR-TI — PSpice® for TI 設計與模擬工具
| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| WQFN (NHZ) | 24 | Ultra Librarian |
訂購與品質
- RoHS
- REACH
- 產品標記
- 鉛塗層/球物料
- MSL 等級/回焊峰值
- MTBF/FIT 估算值
- 材料內容
- 認證摘要
- 進行中持續性的可靠性監測
- 晶圓廠位置
- 組裝地點
建議產品可能具有與此 TI 產品相關的參數、評估模組或參考設計。