SGM4703 Description/概述：
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、立體聲d級音頻功率放大器，具有可調(diào)功率限制（APL）和自動電平控制（ALC）。它的工作電源電壓范圍從5V到26V。24V電源電壓，可以為一對10% THD+N的8Ω揚聲器提供2×40W的峰值輸出功率。
SGM4703的高效率延長了播放音樂的電池壽命，并允許它提供2×20W的輸出功率，而不需要在兩層系統(tǒng)板上有一個笨重的散熱器。它的高PSRR和低電磁干擾排放降低了系統(tǒng)設計和制造的復雜性，并降低了系統(tǒng)成本。
SGM4703具有APL和ALC的功能。APL將峰值音頻輸出限制為用戶定義的值，以保護音頻揚聲器免受過度功耗或過載。APL和ALC調(diào)整音頻放大器的電壓增益，以響應過度限制音頻輸入，消除輸出剪切失真，同時保持最大允許的音頻輸出動態(tài)范圍。APL和ALC的限制電壓可以是用戶定義的值或電源電壓。
SGM4703可以配置為驅動用于立體聲應用的橋接負載（BTL）配置的一對揚聲器，或用于單聲道應用的并行BTL（PBTL）配置的單個揚聲器。
SGM4703具有兩種針對d類音頻放大器的PWM調(diào)制方案：雙側調(diào)制（DSM）和單側調(diào)制（SSM）。
在SGM4703中，針對各種運行故障的綜合保護模式保證了其安全可靠的運行。
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/應用：
Bluetooth/Wireless Speakers
Consumer Audio Speakers
Soundbars
SGM4703 Ordering Information/訂購信息：
|
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/引腳配置：
SGM4703 Pin Description/引腳說明：
SGM4703 Typical Application/典型應用：
SGM4703 Functional Block Diagram/原理框圖：
SGM4703 Typical Application Circuits/典型的應用電路：
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