LM4675 - 具有扩频的超低 EMI、免滤波、2.65W、单声道、D 类音频功率放大器

LM4675是TI德州仪器公司的一款扬声器放大器（AB类/D类）产品，LM4675是具有扩频的超低 EMI、免滤波、2.65W、单声道、D 类音频功率放大器，本站介绍了LM4675的封装应用图解、特点和优点、功能等，并给出了与LM4675相关的TI元器件型号供参考。

LM4675 - 具有扩频的超低 EMI、免滤波、2.65W、单声道、D 类音频功率放大器 - 扬声器放大器（AB类/D类） - 低功耗放大器 - 德州仪器

产品描述

The LM4675 is a single supply, high efficiency, 2.65W, mono, Class D audio amplifier. A spread spectrum, filterless PWM architecture reduces EMI and eliminates the output filter, reducing external component count, board area consumption, system cost, and simplifying design.

The LM4675 is designed to meet the demands of mobile phones and other portable communication devices. Operating on a single 5V supply, it is capable of driving a 4? speaker load at a continuous average output of 2.2W with less than 1% THD+N. Its flexible power supply requirements allow operation from 2.4V to 5.5V. The wide band spread spectrum architecture of the LM4675 reduces EMI-radiated emissions due to the modulator frequency.

The LM4675 has high efficiency with speaker loads compared to a typical Class AB amplifier. With a 3.6V supply driving an 8? speaker, the IC's efficiency for a 100mW power level is 80%, reaching 89% at 400mW output power.

The LM4675 features a low-power consumption shutdown mode. Shutdown may be enabled by driving the Shutdown pin to a logic low (GND).

The gain of the LM4675 is externally configurable 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.

产品特性

Spread Spectrum Architecture Reduces EMI
Mono Class D Operation
No Output Filter Required for Inductive Loads
Externally Configurable Gain
Very Fast Turn On Time: 17μs (typ)
Minimum External Components
"Click and Pop" Suppression Circuitry
Micro-Power Shutdown Mode
Available in Space-Saving 0.5mm Pitch DSBGA and WSON Packages

Key Specifications

Efficiency at 3.6V, 400mW into 8? Speaker: 89% (typ)
Efficiency at 3.6V, 100mW into 8? Speaker: 80% (typ)
Efficiency at 5V, 1W into 8? Speaker: 89% (typ)
Quiescent Current, 3.6V Supply: 2.2mA (typ)
Total Shutdown Power Supply Current: 0.01µA (typ)
Single Supply Range: 2.4V to 5.5V
PSRR, f = 217Hz: 82dB

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