<p><em><span>借助</span><span lang="EN-US">TI</span><span>的低噪声、低纹波降压转换器，工程师可在噪声敏感型应用中实现高效运行</span></em></p>
<p><span>德州仪器（</span><span lang="EN-US">TI</span><span>）近日推出了具有集成铁氧体磁珠补偿功能的新系列低噪声</span><span lang="EN-US">DC/DC</span><span>开关稳压器。</span><span lang="EN-US">TPS62912</span><span>和</span><span lang="EN-US">TPS62913</span><span>在</span><span lang="EN-US">100 Hz</span><span>至</span><span lang="EN-US">100 kHz</span><span>的频率范围内具有</span><span lang="EN-US">20 µVRMS</span><span>的低噪声，以及</span><span lang="EN-US">10 µVRMS</span><span>的超低输出电压纹波，使工程师在其设计中可消除一个或多个低压降稳压器（</span><span lang="EN-US">LDO</span><span>），将功耗最多降低</span><span lang="EN-US">76</span><span>％，并节省</span><span lang="EN-US">36</span><span>％的电路板空间。</span><span>欲了解详细信息，请参考</span><span lang="EN-US"><a href="https://www.ti.com.cn/product/cn/TPS62912?HQS=app-bsr-mv-TPS6291x-pr-pf…;和</span><span lang="EN-US"><a href="https://www.ti.com.cn/product/cn/TPS62913?HQS=app-bsr-mv-TPS6291x-pr-pf…;。</span></p>
<p><span>在许多高精度测试和测量、医疗、航空航天和国防以及无线基础设施应用中，电源噪声是关键的设计挑战。</span><span>传统的低噪声电源体系结构包括一个</span><span lang="EN-US">DC / DC</span><span>转换器；一个低噪声</span><span lang="EN-US">LDO</span><span>，如</span><span lang="EN-US"><a href="https://www.ti.com.cn/product/cn/TPS7A52?HQS=app-bsr-mv-TPS6291x-pr-pf-…;、</span><span lang="EN-US"><a href="https://www.ti.com.cn/product/cn/TPS7A53?HQS=app-bsr-mv-TPS6291x-pr-pf-…;或</span><span lang="EN-US"><a href="https://www.ti.com.cn/product/cn/TPS7A54?HQS=app-bsr-mv-TPS6291x-pr-pf-…;；及一个片外滤波器，如铁氧体磁珠。</span><span>通过集成铁氧体磁珠补偿，</span><span lang="EN-US">TPS62912</span><span>和</span><span lang="EN-US">TPS62913</span><span>使用大多数系统中已存在的铁氧体磁珠作为有效滤波器来抵抗高频噪声，从而将电源输出电压纹波降低了约</span><span lang="EN-US">30 dB</span><span>，并简化了电源设计。如想了解低噪声降压转换器的工作原理，请阅读技术文章</span><span lang="EN-US">“</span><span lang="EN-US"><a href="https://e2e.ti.com/blogs_/b/powerhouse/archive/2020/10/21/minimize-nois… lang="EN-US"><span lang="EN-US">使用低噪声降压转换器将噪声和纹波降</span></span><span lang="EN-US"><span lang="EN-US">到更</span></span><span lang="EN-US"><span lang="EN-US">低</span></span></a></span><span>。</span><span lang="EN-US">”</span></p>
<p><span lang="EN-US">2020</span><span>年</span><span lang="EN-US">11</span><span>月</span><span lang="EN-US">9</span><span>日到</span><span lang="EN-US">12</span><span>日，</span><span lang="EN-US">TI</span><span>将会在线上德国慕尼黑电子展的虚拟展位上展示</span><span lang="EN-US">TPS62913</span><span>。欲了解更多信息，请访问</span><span lang="EN-US"><a href="https://www.ti.com/about-ti/trade-shows/electronica.html"><span>https:/…;。</span></p>
<p><strong><span>轻松降低电源噪声</span></strong></p>
<p><span>高精度系统要求电源轨具有低噪声和低纹波，以保持信号的精度和完整性。</span><span lang="EN-US">TPS62912</span><span>和</span><span lang="EN-US">TPS62913</span><span>均满足这两个要求，且在高达</span><span lang="EN-US">100 kHz</span><span>的频率下具有</span><span lang="EN-US">65 dB</span><span>的电源抑制比。此外，该降压转换器系列的输出电压误差小于</span><span lang="EN-US">1</span><span>％，有助于确保严格的输出电压精度。两种转换器都可使用扩频频率调制来进一步衰减射频杂散，并允许与外部时钟同步，因此工程师可轻松满足其信噪比（</span><span lang="EN-US">SNR</span><span>）和无杂散动态范围（</span><span lang="EN-US">SFDR</span><span>）的目标，这对于类似医学成像或雷达的应用至关重要。</span></p>
<p><strong><span>最大化效率，同时减少功耗</span></strong></p>
<p><span>工程师在为敏感型模拟电路供电时，历来会面临噪声与效率之间的权衡。单独使用开关稳压器会导致过多的开关噪声，而增加后稳压器</span><span lang="EN-US">LDO</span><span>来降低噪声会导致额外的功耗，尤其是在高负载电流下。</span><span lang="EN-US">TPS62912</span><span>和</span><span lang="EN-US">TPS62913</span><span>的峰值效率高达</span><span lang="EN-US">97</span><span>％，使工程师无需</span><span lang="EN-US">LDO</span><span>即可进行噪声滤波设计，将功耗降低</span><span lang="EN-US">76</span><span>％</span><span lang="EN-US">——</span><span>模拟前端（</span><span lang="EN-US">AFE</span><span>）设计为</span><span lang="EN-US">1.8 W</span><span>，使用如</span><span lang="EN-US"><a href="https://www.ti.com.cn/product/cn/ADC12DJ5200RF?HQS=app-bsr-mv-TPS6291x-…;等宽带模拟</span><span lang="EN-US">-</span><span>数字转换器（</span><span lang="EN-US">ADC</span><span>）的设计为</span><span lang="EN-US">1.5W</span><span>。</span><span>这意味着与传统的低噪声电源体系结构相比，效率分别提高了</span><span lang="EN-US">20</span><span>％和</span><span lang="EN-US">15</span><span>％。</span><span>阅读应用手册</span><span lang="EN-US">“</span><span lang="EN-US"><a href="http://www.ti.com/lit/pdf/slvaew7?HQS=app-bsr-mv-TPS6291x-pr-mc-null-cn… lang="EN-US"><span lang="EN-US">使用</span></span><span>TPS62913</span><span lang="EN-US"><span lang="EN-US">低纹波和低噪声降压转换器为噪声敏感型</span></span><span>ADC</span><span lang="EN-US"><span lang="EN-US">供电</span></span></a></span><span>，</span><span lang="EN-US">”</span><span>了解更多信息。</span></p>
<p><strong><span>节省电路板空间和总体系统成本</span></strong></p>
<p><span>通过在设计中使用</span><span lang="EN-US">TPS62912</span><span>或</span><span lang="EN-US">TPS62913</span><span>，工程师不仅可消除线性稳压器，而且还可消除相关的无源组件，这可为每个</span><span lang="EN-US">LDO</span><span>节省约</span><span lang="EN-US">20mm2</span><span>的印刷电路板（</span><span lang="EN-US">PCB</span><span>）面积。通常使用单个</span><span lang="EN-US">LDO</span><span>的设计可节省</span><span lang="EN-US">36</span><span>％的</span><span lang="EN-US">PCB</span><span>空间。此外，降压转换器的集成铁氧体磁珠补偿功能可帮助工程师减少总体</span><span lang="EN-US">DC/DC</span><span>组件数量，从其设计中消除两个电容器和两个电阻，以进一步降低总体系统成本并缩短设计时间。</span></p>
<p><strong><span>关于德州仪器</span></strong><strong><span lang="EN-US">(TI)</span></strong></p>
<p><span>德州仪器（</span><span lang="EN-US">TI</span><span>）（纳斯达克股票代码：</span><span lang="EN-US">TXN</span><span>）是一家全球化的半导体公司，致力于设计、制造、测试和销售模拟和嵌入式处理芯片，用于工业、汽车、个人电子产品、通信设备和企业系统等市场。我们致力于通过半导体技术让电子产品更经济实用，创造一个更美好的世界。如今，每一代创新都建立在上一代创新的基础之上，使我们的技术变得更小巧、更快速、更可靠、更实惠，从而实现半导体在电子产品领域的广泛应用，这就是工程的进步。这正是我们数十年来乃至现在一直在做的事。欲了解更多信息，请访问公司网站</span><span lang="EN-US"><a href="http://www.ti.com.cn"><span>www.ti.com.cn</span></a></span><span>。</span></p>