LM48511 - 具有扩展频谱能力的 3W、超低 EMI、单声道 D 类音频放大器

LM48511是TI德州仪器公司的一款扬声器放大器（AB类/D类）产品，LM48511是具有扩展频谱能力的 3W、超低 EMI、单声道 D 类音频放大器，本站介绍了LM48511的封装应用图解、特点和优点、功能等，并给出了与LM48511相关的TI元器件型号供参考。

LM48511 - 具有扩展频谱能力的 3W、超低 EMI、单声道 D 类音频放大器 - 扬声器放大器（AB类/D类） - 低功耗放大器 - 德州仪器

产品特性

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)

产品应用

GPS
Portable media
Cameras
Mobile Phones
Handheld games

产品说明

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.

产品器件信息

PART NUMBER	PACKAGE	BODY SIZE (NOM)
LM48511	WQFN (24)	5.00 mm × 4.00 mm

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