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通用型音訊放大器

LM48512

現行

具整合式升壓轉換器和 EMI 抑制的 2.7-W、單聲道類比輸入 D 類音訊放大器

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產品規格表

LM48512

現行
產品規格表 立即訂購

產品詳細資料

Audio input type Analog Input Architecture Class-D Boosted Speaker channels (max) Mono Control interface GPIO Output power (W) 2.7 Power stage supply (max) (V) 5.5 Power stage supply (min) (V) 2.3 THD + N at 1 kHz (%) 0.03 Load (min) (Ω) 4 Analog supply voltage (min) (V) 2.3 Analog supply voltage (max) (V) 5.5 Rating Catalog Operating temperature range (°C) -40 to 85
Audio input type Analog Input Architecture Class-D Boosted Speaker channels (max) Mono Control interface GPIO Output power (W) 2.7 Power stage supply (max) (V) 5.5 Power stage supply (min) (V) 2.3 THD + N at 1 kHz (%) 0.03 Load (min) (Ω) 4 Analog supply voltage (min) (V) 2.3 Analog supply voltage (max) (V) 5.5 Rating Catalog Operating temperature range (°C) -40 to 85
DSBGA (YZR) 16 5.0625 mm² 2.25 x 2.25

  • E 2 S System Reduces EMI while Preserving Audio Quality and Efficiency
  • Integrated Boost Converter
  • Supply Voltage Level Detection on Boost Converter
  • Low Power Shutdown Mode
  • "Click and Pop" suppression
    •

  • E 2 S System Reduces EMI while Preserving Audio Quality and Efficiency
  • Integrated Boost Converter
  • Supply Voltage Level Detection on Boost Converter
  • Low Power Shutdown Mode
  • "Click and Pop" suppression
    •

    Part of National’s PowerWise family or products, the LM48512 delivers 1.8W into 8Ω, while consuming 14.5mA of quiescent current. The LM48512 also features National’s Enhanced Emissions Suppression (E 2S) system, a patented, ultra low EMI PWM architecture that significantly reduces RF emissions while preserving audio quality and efficiency. LM48512 improves battery life, reduces external component count, board area consumption, system cost, and simplifies design.

    The LM48512 is designed to meet the demands of portable multimedia devices. The LM48512 features high efficiency compared to other boosted amplifiers and low EMI Class D amplifiers. The LM48512 is capable of driving an 8Ω speaker to 5.5V levels (1.8W) from a 3.6V supply while operating at 82% efficiency. Flexible power supply requirements allow operation from 2.3V to 5.5V. The E 2S system features a patented edge rate control (ERC) architecture that further reduces emissions by minimizing the high frequency component of the device output, while maintaining high quality audio reproduction (THD+N = 0.03%) and high efficiency. A low power shutdown mode reduces supply current consumption to 0.04μA.

    The LM48512 features a battery-saving automatic gain control (AGC). The AGC detects the battery voltage and reduces the gain of the amplifier to limit the output as the battery voltage decreases.

    Superior click and pop suppression eliminates audible transients on power-up/down and during shutdown.

    Key Specifications

    ■  Power Output at VDD = 3.6V   RL = 8Ω, THD+N ≤ 1% 1.8W (typ)
    ■   Efficiency at 3.6V, 800mW into 8Ω 82% (typ)
    ■  Quiescent Power Supply Current   at 3.6V 14.5mA
    ■  Shutdown current 0.04μA (typ)

    Part of National’s PowerWise family or products, the LM48512 delivers 1.8W into 8Ω, while consuming 14.5mA of quiescent current. The LM48512 also features National’s Enhanced Emissions Suppression (E 2S) system, a patented, ultra low EMI PWM architecture that significantly reduces RF emissions while preserving audio quality and efficiency. LM48512 improves battery life, reduces external component count, board area consumption, system cost, and simplifies design.

    The LM48512 is designed to meet the demands of portable multimedia devices. The LM48512 features high efficiency compared to other boosted amplifiers and low EMI Class D amplifiers. The LM48512 is capable of driving an 8Ω speaker to 5.5V levels (1.8W) from a 3.6V supply while operating at 82% efficiency. Flexible power supply requirements allow operation from 2.3V to 5.5V. The E 2S system features a patented edge rate control (ERC) architecture that further reduces emissions by minimizing the high frequency component of the device output, while maintaining high quality audio reproduction (THD+N = 0.03%) and high efficiency. A low power shutdown mode reduces supply current consumption to 0.04μA.

    The LM48512 features a battery-saving automatic gain control (AGC). The AGC detects the battery voltage and reduces the gain of the amplifier to limit the output as the battery voltage decreases.

    Superior click and pop suppression eliminates audible transients on power-up/down and during shutdown.

    Key Specifications

    ■  Power Output at VDD = 3.6V   RL = 8Ω, THD+N ≤ 1% 1.8W (typ)
    ■   Efficiency at 3.6V, 800mW into 8Ω 82% (typ)
    ■  Quiescent Power Supply Current   at 3.6V 14.5mA
    ■  Shutdown current 0.04μA (typ)

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    類型 標題 日期
    * Data sheet PowerWise Boosted, Ultra Lo-EMI, Mono, E2S Class D Audio Pwr Amp datasheet (Rev. A) 2012年 4月 9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

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