具有扩展频谱能力的 3W、超低 EMI、单声道 D 类音频放大器

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参数

Audio input type Analog Input Architecture Class-D Boosted Speaker channels (Max) Mono Power stage supply (Max) (V) 5.5 Power stage supply (Min) (V) 3 Load (Min) (ohms) 4 Output power (W) 6.7 SNR (dB) 97 THD + N @ 1 kHz (%) 0.04 Iq (Typ) (mA) 13.5 Control interface Hardware Closed/open loop Open Analog supply (Min) (V) 3 Analog supply (Max) (V) 5.5 PSRR (dB) 88 Rating Catalog Operating temperature range (C) -40 to 85 open-in-new 查找其它 扬声器放大器

封装|引脚|尺寸

WQFN (NHZ) 24 20 mm² 5 x 4 open-in-new 查找其它 扬声器放大器

特性

  • 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)

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描述

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.

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技术文档

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类型 标题 下载最新的英文版本 发布
应用手册 Guidelines for Measuring Audio Power Amplifier Performance 2019年 8月 26日
应用手册 AN-1849 An Audio Amplifier Power Supply Design 2019年 6月 27日
用户指南 AN-1922 LM48511 Evaluation Board User's Guide 2013年 5月 1日
更多文献资料 The LM48511 Integrates a Boost Converter with a High Efficiency 2012年 1月 26日

设计与开发

有关其他条款或所需资源,请点击下面的任何链接来查看详情页面。

硬件开发

评估板 下载
document-generic 用户指南
$199.00
说明

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.

特性
  • 3W Output into 8Ω at 5V with THD+N = 1%
  • Selectable spread spectrum mode reduces EMI
  • 81% Efficiency
  • Independent Regulator and Amplifier Shutdown Controls
  • Dynamically Selectable Regulator Output Voltages
  • Filterless Class D
  • 3.0V - 5.5V operation
  • Low Shutdown Current
  • Click and Pop Suppression

Applications:

  • GPS
  • (...)

设计工具和仿真

计算工具 下载
用于数字双二阶滤波器的系数计算器
COEFFICIENT-CALC COEFFICIENT-CALC (TIBQ) 可以计算 TI 音频编解码器中实施的数字滤波器双二阶传输函数的系数。通过选择滤波器类型并在显示传输函数增益和相位图的窗口中移动控制点,可以对数字滤波器的特性进行调节。

CAD/CAE 符号

封装 引脚 下载
WQFN (NHZ) 24 视图选项

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