The SGM4703 is a high-power, high-efficiency, stereo Class-D audio power amplifier with adjustable power limit (APL) and automatic level control (ALC). It operates with a wide range of supply voltages from 5V to 26V. With 24V supply voltage, it can deliver 2 × 40W peak output power for a pair of 8Ω speakers with 10% THD+N.

    The high efficiency of SGM4703 extends battery life in playing music and allows it to deliver an output power of 2 × 20W without the need for a bulky heat sink on a two-layer system board. Its high PSRR and low EMI emission reduce system design and manufacturing complexities, as well as lower system cost.

    The SGM4703 features APL and ALC. The APL limits peak audio outputs to a user-defined value to protect audio speakers from excessive power dissipation or over-load. The APL and ALC adjust the voltage gain of the audio amplifiers in response to over-limit audio inputs, eliminating output clipping distortion while maintaining a maximally allowed dynamic range of audio outputs. The limiting voltage of APL and ALC can be either a user-defined value or the supply voltage.

    The SGM4703 can be configured into driving either a pair of speakers in Bridge-Tied-Load (BTL) configuration for stereo applications or a single speaker in Parallel BTL (PBTL)  configuration for mono applications.

    The SGM4703 features two PWM modulation schemes for Class-D audio amplifiers: Dual-Side-Modulation (DSM) and Single-Side-Modulation (SSM). 

    In SGM4703, comprehensive protection modes against various operating faults ensure its safe and reliable operation.

    SGM4703是一款高功率、高效、立体声d级音频功率放大器，具有可调功率限制（APL）和自动电平控制（ALC）。它的工作电源电压范围从5V到26V。24V电源电压，可以为一对10% THD+N的8Ω扬声器提供2×40W的峰值输出功率。

    SGM4703的高效率延长了播放音乐的电池寿命，并允许它提供2×20W的输出功率，而不需要在两层系统板上有一个笨重的散热器。它的高PSRR和低电磁干扰排放降低了系统设计和制造的复杂性，并降低了系统成本。

    SGM4703具有APL和ALC的功能。APL将峰值音频输出限制为用户定义的值，以保护音频扬声器免受过度功耗或过载。APL和ALC调整音频放大器的电压增益，以响应过度限制音频输入，消除输出剪切失真，同时保持最大允许的音频输出动态范围。APL和ALC的限制电压可以是用户定义的值或电源电压。

    SGM4703可以配置为驱动用于立体声应用的桥接负载（BTL）配置的一对扬声器，或用于单声道应用的并行BTL（PBTL）配置的单个扬声器。

    SGM4703具有两种针对d类音频放大器的PWM调制方案：双侧调制（DSM）和单侧调制（SSM）。

    在SGM4703中，针对各种运行故障的综合保护模式保证了其安全可靠的运行。

SGM4703 Features/特性：

Wide Range of Supply Voltages from 5V to 26V

Adjustable Power Limit to Safeguard Audio Speakers

Automatic Level Control to Eliminate Output Clipping

Four Selectable Gain Settings: 20/26/30/34dB 

Three Selectable ALC Dynamic Characteristics

Two Selectable PWM Frequencies with Optional Spread-Spectrum: 360kHz and 500kHz 

Two Selectable Modulation Schemes: SSM and DSM 

Optional PBTL Configuration for Mono Applications 

Peak Output Power in Non-ALC 

  -2 × 40W (VDD = 24V, 8Ω + 33μH, BTL, THD+N = 10%) 

  -2 × 32W (VDD = 24V, 8Ω + 33μH, BTL, THD+N = 1%)

  -80W (VDD = 24V, 4Ω + 33μH, PBTL, THD+N = 10%) 

  -64W (VDD = 24V, 4Ω + 33μH, PBTL, THD+N = 1%) 

ALC Output Power (THD+N < 0.5%) in ALC 

  -2 × 30W (VDD = 24V, 8Ω + 33μH, BTL) 

  -2 × 21W (VDD = 15V, 4Ω + 33μH, BTL) 

  -60W (VDD = 24V, 4Ω + 33μH, PBTL) 

Wide ALC Dynamic Range: 12dB (VDD = 12V) 

Low THD+N: 0.02% (VDD = 24V, 8Ω + 33μH, PO = 20W/Ch)

High PSRR: 80dB at 1kHz with SSM

Protection Modes against Various Operating Faults Including Under-Voltage, Over-Voltage, Over-Current, Over-Temperature, and DC-Detect 

Available in a Green TSSOP-28 (Exposed Pad) Package

SGM4703 Applications/应用：

Bluetooth/Wireless Speakers

Consumer Audio Speakers

Soundbars

SGM4703 Ordering Information/订购信息：

MODEL	PACKAGE DESCRIPTION	SPECIFIED TEMPERATURE RANGE	ORDERING NUMBER	PACKAGE MARKING	PACKING OPTION
SGM4703	TSSOP-28 (Exposed Pad)	-40℃ to +85℃	SGM4703YPTS28G/TR	SGM4703 YPTS28 XXXXX	Tape and Reel, 4000

SGM4703 Pin Configuration/引脚配置：