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<p><span>目前，户外蓝牙音箱（包括手提音箱及拉杆音箱等产品类型）深受消费者的喜爱，其便携性既能满足家用，也能满足一定时间内的户外使用，其音质效果优于一般的小蓝牙音箱，适合户外活动广场舞等场合。因其体积重量要求的要求决定了供电是以单节<span lang="EN-US">18650</span>锂电池为供电电源。<strong>深圳市永阜康科技有限公司</strong>最新推广的内置自适应动态升压<span lang="EN-US">15W</span>单声道<span lang="EN-US">F</span>类音频功放<span lang="EN-US">IC-</span></span><span lang="EN-US"><a href="http://www.szczkjgs.com/products_4892.htm"><span>HT8731</span></a></spa…;，该芯片音质表现高音通透、低音震撼、人声甜美，能完美实现<span lang="EN-US">3.7V</span>单节锂电供电音箱产品的性能升级迭代。</span></p>

<p><span lang="EN-US"><a href="http://www.szczkjgs.com/products_4892.htm"><span>HT8731</span></a></spa…，能根据芯片需要输出功率的大小来对应调整电源模块的输出电压，最大限度提高锂电池的续航时间；其输入电流限制功能可设定最大输入电流，以免因锂电池瞬间电压跌落太低造成主控重启；能通过一个主控<span lang="EN-US">IO</span>口实现关断、开启、<span lang="EN-US">D</span>类<span lang="EN-US">/AB</span>类、防破音开启<span lang="EN-US">/</span>关闭等各种模式的切换，节省蓝牙主控的资源；<span lang="EN-US">2</span>档防破音模式，<span lang="EN-US">ACF1</span>宽动态音量震撼模式适合户外蓝牙音箱，<span lang="EN-US">ACF2</span>高保真低失真模式适合小箱体的蓝牙音箱，两种模式选择只需要改动外围电阻，便可呈现不同风格的音质。</span></p>

<p><span lang="EN-US"><a href="http://www.szczkjgs.com/products_4892.htm"><span>HT8731</span></a></spa… lang="EN-US">H</span>类升压的单声道<span lang="EN-US">D</span>类音频功率放大器， 由锂电池供电时，<span lang="EN-US">THD+N&lt;1%</span>、<span lang="EN-US">20-20kHz</span>全频段信号条件下，能连续输出<span lang="EN-US">6W</span>功率（<span lang="EN-US">4</span>Ω负载）；另外，其还支持<span lang="EN-US">AB</span>类模式。</span><span lang="EN-US"><a href="http://www.szczkjgs.com/products_4892.htm"><span>HT8731</span></a></spa… lang="EN-US">H</span>类升压，提供<span lang="EN-US">8.0V</span>最大输出电压。其小音乐信号时不升压，仅当功率较大时，提供一个适应输出功率的电压给<span lang="EN-US">D</span>类功放，其可大幅提高系统效率，延长电池续航时间。</span><span lang="EN-US"><a href="http://www.szczkjgs.com/products_4892.htm"><span>HT8731</span></a></spa…（<span lang="EN-US">ACF</span>）输出控制功能，可检测并抑制由于输入音乐、语音信号幅度过大所引起的输出信号削顶失真（破音），也能自适应地防止在<span lang="EN-US">BOOST</span>升压电压下降所造成的输出削顶，显著提高音质，创造非常舒适的听音享受，并保护扬声器免受过载损坏。</span><span lang="EN-US"><a href="http://www.szczkjgs.com/products_4892.htm"><span>HT8731</span></a></spa… lang="EN-US">ACF</span>模式，以及<span lang="EN-US">ACF-Off </span>模式。</span><span lang="EN-US"><a href="http://www.szczkjgs.com/products_4892.htm"><span>HT8731</span></a></spa… lang="EN-US">AB</span>类和<span lang="EN-US">D</span>类的自由切换功能，在受到<span lang="EN-US">D</span>类功放<span lang="EN-US">EMI</span>干扰困扰时，可随时切换至<span lang="EN-US">AB</span>类音频功放模式。</span></p>

<p><span lang="EN-US"><a href="http://www.szczkjgs.com/products_4892.htm"><span>HT8731</span></a></spa…，能够直接驱动扬声器，并最大程度减小脉冲输出信号的失真和噪音。输出无需滤波网络，极少的外部元器件节省了系统空间和成本，是便携式应用的理想选择。此外，</span><span lang="EN-US"><a href="http://www.szczkjgs.com/products_4892.htm"><span>HT8731</span></a></spa…、片内过温保护等功能。</span></p>

<p><span lang="EN-US">HT8731</span><span>自适应动态升压波形：</span></p>

<p><img alt="HT8731应用特性" data-entity-type="file" data-entity-uuid="d062e2b0-4d99-466f-a222-3767473daf6c" src="http://new.eetrend.com/files/2021-03/wen_zhang_/100062753-125253-1.jpg&…; /></p>

<p><span lang="EN-US">HT8731</span><span>应用特性</span></p>

<p><span lang="EN-US">1. HT8731</span><span>脚位图以及管脚说明</span></p>

<p><img alt="HT8731脚位图以及管脚说明" data-entity-type="file" data-entity-uuid="922af010-471e-4aba-998b-df385facc113" src="http://new.eetrend.com/files/2021-03/wen_zhang_/100062753-125254-2.jpg&…; /></p>

<p><img alt="HT8731脚位图以及管脚说明" data-entity-type="file" data-entity-uuid="c0e3fa07-1d88-41d8-bfcf-657b5fbcd35f" src="http://new.eetrend.com/files/2021-03/wen_zhang_/100062753-125255-3.jpg&…; /></p>

<p><span lang="EN-US">2.</span><span lang="EN-US"> HT8731 </span><span>应用原理图</span><span lang="EN-US"> </span></p>

<p><img alt="HT8731 应用原理图" data-entity-type="file" data-entity-uuid="e2e199e5-0121-4d0a-b021-9efc368b7228" src="http://new.eetrend.com/files/2021-03/wen_zhang_/100062753-125256-4.jpg&…; /></p>

<p><span lang="EN-US">3.</span><span lang="EN-US"> HT8731<span>DEMO</span></span><span>板</span><span lang="EN-US">PCB</span><span>顶层设计图</span><strong><span lang="EN-US"> </span></strong></p>

<p><img alt="HT8731DEMO板PCB顶层设计图" data-entity-type="file" data-entity-uuid="6e7f1244-e03e-46c9-95e5-77386e3b8d74" src="http://new.eetrend.com/files/2021-03/wen_zhang_/100062753-125257-5.jpg&…; /></p>

<p><span lang="EN-US">4. </span><span lang="EN-US">HT8731</span><span lang="EN-US"> DEMO</span><span>板<span lang="EN-US">PCB</span>底层设计图</span></p>

<p><img alt="HT8731 DEMO板PCB底层设计图" data-entity-type="file" data-entity-uuid="b55b55f6-ca7c-4f97-8a15-cf87ca377869" src="http://new.eetrend.com/files/2021-03/wen_zhang_/100062753-125258-6.jpg&…; /></p>

<p><span lang="EN-US">5. </span><span lang="EN-US">HT8731</span><span lang="EN-US"> DEMO</span><span>板贴片图</span></p>

<p><img alt="HT8731 DEMO板贴片图" data-entity-type="file" data-entity-uuid="f61aa64b-e8ef-4fd1-bcc9-403adf37250e" src="http://new.eetrend.com/files/2021-03/wen_zhang_/100062753-125259-7.jpg&…; /></p>

<p><span lang="EN-US">6.</span><span lang="EN-US"> HT8731</span><span lang="EN-US"> DEMO</span><span>板物料清单</span><span lang="EN-US"> <!--[if gte mso 9]><xml>
<o:OLEObject Type="Embed" ProgID="Excel.Sheet.12" ShapeID="_x0000_i1025"
DrawAspect="Content" ObjectID="_1676815161">
</o:OLEObject>
</xml><![endif]--></span></p>

<p><img alt="HT8731 DEMO板物料清单" data-entity-type="file" data-entity-uuid="b85c81b6-4831-44e1-9221-0d9d1f30361f" src="http://new.eetrend.com/files/2021-03/wen_zhang_/100062753-125260-8.jpg&…; /></p>

<p><span lang="EN-US">7. HT8731 DEMO</span><span>板实物图</span></p>

<p><img alt="HT8731 DEMO板实物图" data-entity-type="file" data-entity-uuid="50bebab6-da75-407d-b172-5172638bee10" src="http://new.eetrend.com/files/2021-03/wen_zhang_/100062753-125261-9.jpg&…; /></p>