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LM48511

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具有集成升压转换器的 3W 单声道、模拟输入 D 类音频放大器

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LM48511

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产品详情

Audio input type Analog Input Architecture Class-D Boosted Speaker channels (max) Mono Rating Catalog Power stage supply (max) (V) 5.5 Power stage supply (min) (V) 3 Load (min) (Ω) 4 Output power (W) 6.7 SNR (dB) 97 THD + N at 1 kHz (%) 0.04 Iq (typ) (mA) 13.5 Control interface Hardware Closed/open loop Open Analog supply (min) (V) 3 Analog supply voltage (max) (V) 5.5 PSRR (dB) 88 Operating temperature range (°C) -40 to 85
Audio input type Analog Input Architecture Class-D Boosted Speaker channels (max) Mono Rating Catalog Power stage supply (max) (V) 5.5 Power stage supply (min) (V) 3 Load (min) (Ω) 4 Output power (W) 6.7 SNR (dB) 97 THD + N at 1 kHz (%) 0.04 Iq (typ) (mA) 13.5 Control interface Hardware Closed/open loop Open Analog supply (min) (V) 3 Analog supply voltage (max) (V) 5.5 PSRR (dB) 88 Operating temperature range (°C) -40 to 85
WQFN (NHZ) 24 20 mm² 5 x 4
  • 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)
  • 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)

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.

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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类型 标题 下载最新的英语版本 日期
* 数据表 LM48511 3-W, Ultra-Low EMI, Filterless, Mono, Class D Audio Power Amplifier With Spread Spectrum 数据表 (Rev. K) PDF | HTML 2019年 10月 8日
应用手册 Guidelines for Measuring Audio Power Amplifier Performance (Rev. A) 2019年 8月 26日
应用手册 AN-1849 An Audio Amplifier Power Supply Design (Rev. C) 2019年 6月 27日
应用手册 AN-1737 Managing EMI in Class D Audio Applications (Rev. A) 2013年 5月 1日
EVM 用户指南 AN-1922 LM48511 Evaluation Board User's Guide (Rev. C) 2013年 5月 1日
更多文献资料 LM48511SQ Demo Board Description and Setup Instructions 2012年 1月 26日

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LM48511SQBD — LM48511 集成了高效升压转换器

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.

用户指南: PDF
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