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Current Sense Amplifier Design Guide and Application Examples
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<style>.text-center{ text-align:center; }.img-600{ width:600px; padding-bottom:2rem; }</style><p class="text-center"><img class="img-600" alt="Current Sense Amplifier Design Considerations and Examples" src="/content/dam/richtek-eds/resources/tech-insights/news/newsletter-issue-55/html-images/zh-cn_image001_CN.jpg" /></p>

精确的电流监控不仅是电路保护的基础,更是提升系统性能与能源管理效率的关键。通过电流检测技术,系统能够实时掌握功耗变化,实现过电流保护、动态效率调节与远程监控等功能。电流检测放大器按架构可分为两大类型:

  • 数字型:可输出完整的电压、电流与功率数据,并支持 I2C、SMBus 接口,特别适用于待机管理与数据分析需求。
  • 模拟型:响应速度快、电路结构简洁,适用于实时反馈与保护类应用。

<br>为满足多样化的系统需求,立锜科技推出多款高精度电流检测放大器,涵盖数字型 RTQ6132 / RTQ6134 / RTQ6136、 RTQ6059、 RTQ6053/ RTQ6056,以及模拟型 RTQ6060A/RTQ6060B、 RTQ6050/RTQ6052等产品系列,提供广泛的电压范围与多种精度等级,助力系统设计人员快速构建最合适的电源监控解决方案。

应用示例

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<style> .table-responsive { width: 100%; overflow-x: auto; overflow-y: hidden; -webkit-overflow-scrolling: touch; } .table { width: 100%; border-collapse: collapse; margin-bottom: 1rem; color: #33373E; } .table th, .table td { border: 1px solid #dee2e6; padding: 12px 15px; vertical-align: middle; } .table th { white-space: normal; } .table td { white-space: normal; word-break: break-word; } .table thead th { background-color: #e9ecef; color: #495057; font-weight: 600; } .table tbody tr:hover { background-color: #f2f2f2; } .table a { color: #37a6d9; text-decoration: none; font-size: 1.1rem; } .table a:hover { text-decoration: underline; }</style><div class="table-responsive"><table class="table body-1"><thead><tr><th scope="col">应用</th><th scope="col">说明</th></tr></thead><tbody><tr><th scope="row">服务器</th><td>在数据中心应用中,电流检测放大器用于电源监控、能效优化及远程诊断。RTQ6136 专为 48V 系统设计,具备 75V AMR 共模电压能力,满足高可靠度电源监控需求。</td></tr><tr><th scope="row">USB Power Delivery (USB PD)</th><td>通过精确的电流检测,确保充电安全并提升整体效率。<a href="https://www.richtek.com/RedirectToProduct?specid=RTQ6059&amp;utm_source=Newsletter&amp;utm_medium=RTWWW&amp;utm_campaign=Issue55CN&amp;sc_lang=zh-CN" target="_blank" style="text-decoration: none; color: #37a6d9;font-size: 1.1rem;"> RTQ6059</a> 具备两个地址选择引脚,可设置多达 16 个不同地址,适用于单一嵌入式控制器(EC)管理多个 USB 接口的多端口 PD 系统。</td></tr><tr><th scope="row">PoE 以太网供电</th><td>电流检测可用于判断 PD 类型与功率需求,动态分配总功率以防止多 PD 系统过载。推荐选用具低压检测功能的<a href="https://www.richtek.com/RedirectToProduct?specid=RTQ6056&amp;utm_source=Newsletter&amp;utm_medium=RTWWW&amp;utm_campaign=Issue55CN&amp;sc_lang=zh-CN" target="_blank" style="text-decoration: none; color: #37a6d9;font-size: 1.1rem;"> RTQ6056</a>,配置在低压端监控 PoE 输入并协助系统控制。</td></tr><tr><th scope="row">台式机</th><td>实时监控输入电流以提升系统性能与可靠性,同时降低设计风险。<a href="https://www.richtek.com/RedirectToProduct?specid=RTQ6060&amp;utm_source=Newsletter&amp;utm_medium=RTWWW&amp;utm_campaign=Issue55CN&amp;sc_lang=zh-CN" target="_blank" style="text-decoration: none; color: #37a6d9;font-size: 1.1rem;"> RTQ6060 </a>可作为主要电源监控元件,快速回报电流变化至嵌入式控制器,使系统能即时调整运行参数。</td></tr></tbody></table></div>
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电流检测技术已成为电源管理与系统设计中不可或缺的关键环节。立锜科技提供完整的电流检测放大器产品组合,助力构建更高效、更可靠的系统。
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阅读应用笔记
/content/richtek-eds/zh-cn/design-support/application-notes/an091
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数字型

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<style>.table-container{ width:100%; overflow:hidden;}.product-table{ width:100%; border-collapse:collapse; table-layout:fixed; background:#fff;}.product-table th{ background:#ececec; color:#37455a; font-weight:700; text-align:center; padding:14px 10px; border:1px solid #d7dce2; white-space:normal; line-height:1.3;}.product-table td{ padding:14px 10px; border:1px solid #d7dce2; text-align:center; vertical-align:middle; overflow-wrap:break-word; word-break:break-word;}.product-table tbody tr:hover{ background:#f8f9fb;}.product-link{font-weight:700; text-decoration:none;}.product-link:hover{ text-decoration:none;}.buy-col{ width:60px; font-size:20px;} .product-cell{display:flex;align-items:center;justify-content:center;gap:4px;flex-wrap:wrap;} .product-cell a:first-child{white-space:nowrap;} .ds-icon{display:flex;align-items:center;justify-content:center;font-size:20px;line-height:1;} .ds-icon,.product-cell img{flex-shrink:0;}.product-table th:nth-child(1),.product-table td:nth-child(1){ width:16%;}.product-table th:nth-child(2),.product-table td:nth-child(2){ width:15%;}.product-table th:nth-child(3),.product-table td:nth-child(3){ width:11%;}.product-table th:nth-child(4),.product-table td:nth-child(4){ width:17%;}.product-table th:nth-child(5),.product-table td:nth-child(5){ width:18%;}.product-table th:nth-child(6),.product-table td:nth-child(6){ width:12%;}.product-table th:nth-child(7),.product-table td:nth-child(7){ width:7%;}@media (max-width:1024px){ .product-table th, .product-table td{ padding:12px 8px; font-size:14px; }}@media (max-width:768px){ .table-container{ overflow-x:auto; overflow-y:hidden; -webkit-overflow-scrolling:touch; } .product-table{ min-width:700px; } .product-table th, .product-table td{ font-size:14px; padding:10px 8px; }}</style><div class="table-container"><table class="product-table"><thead><tr><th>Product<br>Number</th><th>Common Mode<br>Voltage Range</th><th>Maximum<br>Offset</th><th>Maximum Gain<br>Error</th><th>Input Sense<br>Range</th><th>Package(s)</th><th>Buy</th></tr></thead><tbody><tr><td><strong>RTQ6136</strong></td><td>0V to 60V</td><td>4µV</td><td>0.1%</td><td>Programmable</td><td>TWCSP-8P, TSOT-28</td><td class="buy-col"><a href="https://forms.office.com/Pages/ResponsePage.aspx?id=6GOM0O6GNE6h5UQzg3P0seMVen-xb9hAr_ZA0LheCTNUOUJXOTZSRVZNSFlGU0xIMTZJMzRXSk9IRC4u" target="_blank"><img alt="Buy-on-Line" border="0" src="/content/dam/richtek-eds/resources/images/common/news/ic-email.png"></a></td></tr><tr><td><strong>RTQ6134</strong></td><td>0V to 60V</td><td>80µV</td><td>0.5%</td><td>Programmable</td><td>TWCSP-8P</td><td class="buy-col"><a href="https://forms.office.com/Pages/ResponsePage.aspx?id=6GOM0O6GNE6h5UQzg3P0seMVen-xb9hAr_ZA0LheCTNUOUJXOTZSRVZNSFlGU0xIMTZJMzRXSk9IRC4u" target="_blank"><img alt="Buy-on-Line" border="0" src="/content/dam/richtek-eds/resources/images/common/news/ic-email.png"></a></td></tr><tr><td><strong>RTQ6132</strong></td><td>0V to 60V</td><td>40µV</td><td>0.3%</td><td>Programmable</td><td>TSOT-28</td><td class="buy-col"><a href="https://forms.office.com/Pages/ResponsePage.aspx?id=6GOM0O6GNE6h5UQzg3P0seMVen-xb9hAr_ZA0LheCTNUOUJXOTZSRVZNSFlGU0xIMTZJMzRXSk9IRC4u" target="_blank"><img alt="Buy-on-Line" border="0" src="/content/dam/richtek-eds/resources/images/common/news/ic-email.png"></a></td></tr><tr><td class="product-link"><div class="product-cell"><a href="https://www.richtek.com/RedirectToProduct?specid=RTQ6059&amp;utm_source=Newsletter&amp;utm_medium=RTWWW&amp;utm_campaign=Issue55EN&amp;sc_lang=en" target="_blank" style="text-decoration: none; color: #37a6d9;">RTQ6059</a><a href="https://www.richtek.com/SaveDownload.aspx?specid=RTQ6059&amp;utm_source=Newsletter&amp;utm_medium=RTWWW&amp;utm_campaign=Issue55EN&amp;sc_lang=en" target="_blank" style="padding:0px;text-decoration:none;display:inline-block"><img align="middle" style="padding-bottom: 3px;" alt="download datasheet" border="0" src="/content/dam/richtek-eds/resources/images/common/news/ic-download-2.png" class="ds-icon"></a></div></td><td>0V to 32V</td><td>50µV</td><td>0.3%</td><td>Programmable</td><td>TSOT-23-8, MSOP-10</td><td class="buy-col"><a href="https://www.digikey.com/en/products/result?s=N4IgTCBcDaIEoBUCKA2ADAVgJwgLoF8g" target="_blank"><img alt="Buy-on-Line" border="0" src="/content/dam/richtek-eds/resources/images/common/news/ic-cart.png"></a></td></tr><tr><td class="product-link"><div class="product-cell"><a href="https://www.richtek.com/RedirectToProduct?specid=RTQ6056&amp;utm_source=Newsletter&amp;utm_medium=RTWWW&amp;utm_campaign=Issue55EN&amp;sc_lang=en" target="_blank" style="text-decoration: none; color: #37a6d9;">RTQ6056</a><a href="https://www.richtek.com/SaveDownload.aspx?specid=RTQ6056&amp;utm_source=Newsletter&amp;utm_medium=RTWWW&amp;utm_campaign=Issue55EN&amp;sc_lang=en" target="_blank" style="padding:0px;text-decoration:none;display:inline-block"><img align="middle" style="padding-bottom: 3px;" alt="download datasheet" border="0" src="/content/dam/richtek-eds/resources/images/common/news/ic-download-2.png" class="ds-icon"></a></div></td><td>0V to 36V</td><td>10µV</td><td>0.12%</td><td>Fixed</td><td>MSOP-10</td><td class="buy-col"><a href="https://www.digikey.com/en/products/result?s=N4IgTCBcDaIEoBUCKA2ADAVhSAugXyA" target="_blank"><img alt="Buy-on-Line" border="0" src="/content/dam/richtek-eds/resources/images/common/news/ic-cart.png"></a></td></tr><tr><td class="product-link"><div class="product-cell"><a href="https://www.richtek.com/RedirectToProduct?specid=RTQ6053/RTQ6053B&amp;utm_source=Newsletter&amp;utm_medium=RTWWW&amp;utm_campaign=Issue55EN&amp;sc_lang=en" target="_blank" style="text-decoration: none; color: #37a6d9;">RTQ6053</a> <a href="https://www.richtek.com/SaveDownload.aspx?specid=RTQ6053/RTQ6053B&amp;utm_source=Newsletter&amp;utm_medium=RTWWW&amp;utm_campaign=Issue55EN&amp;sc_lang=en" target="_blank" style="padding:0px;text-decoration:none;display:inline-block"><img align="middle" style="padding-bottom: 3px;" alt="download datasheet" border="0" src="/content/dam/richtek-eds/resources/images/common/news/ic-download-2.png" class="ds-icon"></a></div></td><td>0V to 36V</td><td>25µV</td><td>0.3%</td><td>Fixed</td><td>VQFN-16L</td><td class="buy-col"><a href="https://www.digikey.com/en/products/result?s=N4IgTCBcDaIEoBUCKA2ADAVgMwgLoF8g" target="_blank"><img alt="Buy-on-Line" border="0" src="/content/dam/richtek-eds/resources/images/common/news/ic-cart.png" ></a></td></tr></tbody></table></div>
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模拟型

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<div class="table-container"><table class="product-table"><thead><tr><th>Product<br>Number</th><th>Common Mode<br>Voltage Range</th><th>Maximum<br>Offset</th><th>Maximum Gain<br>Error</th><th>Available Gain</th><th>Package(s)</th><th>Buy</th></tr></thead><tbody><tr><td class="product-link"><div class="product-cell"><a href="https://www.richtek.com/RedirectToProduct?specid=RTQ6060&amp;utm_source=Newsletter&amp;utm_medium=RTWWW&amp;utm_campaign=Issue55EN&amp;sc_lang=en" target="_blank" style="text-decoration: none; color: #37a6d9;">RTQ6060A</a> <a href="https://www.richtek.com/SaveDownload.aspx?specid=RTQ6060&amp;utm_source=Newsletter&amp;utm_medium=RTWWW&amp;utm_campaign=Issue55EN&amp;sc_lang=en" target="_blank" style="padding:0px;text-decoration:none;display:inline-block"><img align="middle" style="padding-bottom: 3px;" alt="download datasheet" border="0" src="/content/dam/richtek-eds/resources/images/common/news/ic-download-2.png" class="ds-icon"></a></div></td><td>0V to 36V</td><td>±35µV~±100µV</td><td>±0.4%</td><td>50V/V、75V/V、100V/V、200V/V、500V/V、1000V/V</td><td>SC-70-6</td><td class="buy-col"><a href="https://forms.office.com/Pages/ResponsePage.aspx?id=6GOM0O6GNE6h5UQzg3P0seMVen-xb9hAr_ZA0LheCTNUOUJXOTZSRVZNSFlGU0xIMTZJMzRXSk9IRC4u" target="_blank"><img alt="Buy-on-Line" border="0" src="/content/dam/richtek-eds/resources/images/common/news/ic-email.png"></a></td></tr><tr><td class="product-link"><div class="product-cell"><a href="https://www.richtek.com/RedirectToProduct?specid=RTQ6060&amp;utm_source=Newsletter&amp;utm_medium=RTWWW&amp;utm_campaign=Issue55EN&amp;sc_lang=en" target="_blank" style="text-decoration: none; color: #37a6d9;">RTQ6060B</a> <a href="https://www.richtek.com/SaveDownload.aspx?specid=RTQ6060&amp;utm_source=Newsletter&amp;utm_medium=RTWWW&amp;utm_campaign=Issue55EN&amp;sc_lang=en" target="_blank" style="padding:0px;text-decoration:none;display:inline-block"><img align="middle" style="padding-bottom: 3px;" alt="download datasheet" border="0" src="/content/dam/richtek-eds/resources/images/common/news/ic-download-2.png" class="ds-icon"></a></div></td><td>0V to 36V</td><td>±150µV</td><td>±0.8%</td><td>50V/V、75V/V、100V/V、200V/V、500V/V、1000V/V</td><td>SC-70-6</td><td class="buy-col"><a href="https://forms.office.com/Pages/ResponsePage.aspx?id=6GOM0O6GNE6h5UQzg3P0seMVen-xb9hAr_ZA0LheCTNUOUJXOTZSRVZNSFlGU0xIMTZJMzRXSk9IRC4u" target="_blank"><img alt="Buy-on-Line" border="0" src="/content/dam/richtek-eds/resources/images/common/news/ic-email.png"></a></td></tr><tr><td class="product-link"><div class="product-cell"><a href="https://www.richtek.com/RedirectToProduct?specid=RTQ6050/RTQ6052&amp;utm_source=Newsletter&amp;utm_medium=RTWWW&amp;utm_campaign=Issue55EN&amp;sc_lang=en" target="_blank" style="text-decoration: none; color: #37a6d9;">RTQ6052</a> <a href="https://www.richtek.com/SaveDownload.aspx?specid=RTQ6050/RTQ6052&amp;utm_source=Newsletter&amp;utm_medium=RTWWW&amp;utm_campaign=Issue55EN&amp;sc_lang=en" target="_blank" style="padding:0px;text-decoration:none;display:inline-block"><img align="middle" style="padding-bottom: 3px;" alt="download datasheet" border="0" src="/content/dam/richtek-eds/resources/images/common/news/ic-download-2.png" class="ds-icon"></a></div></td><td>2V to 80V</td><td>±2.5mV</td><td>±2%</td><td>100V/V</td><td>MSOP-8, SOP-8</td><td class="buy-col"><a href="https://www.digikey.com/en/products/result?s=N4IgTCBcDaIEoBUCKA2ADAVggXQL5A" target="_blank"><img alt="Buy-on-Line" border="0" src="/content/dam/richtek-eds/resources/images/common/news/ic-cart.png" ></a></td></tr><tr><td class="product-link"><div class="product-cell"><a href="https://www.richtek.com/RedirectToProduct?specid=RTQ6050/RTQ6052&amp;utm_source=Newsletter&amp;utm_medium=RTWWW&amp;utm_campaign=Issue55EN&amp;sc_lang=en" target="_blank" style="text-decoration: none; color: #37a6d9;">RTQ6050</a> <a href="https://www.richtek.com/SaveDownload.aspx?specid=RTQ6050/RTQ6052&amp;utm_source=Newsletter&amp;utm_medium=RTWWW&amp;utm_campaign=Issue55EN&amp;sc_lang=en" target="_blank" style="padding:0px;text-decoration:none;display:inline-block"><img align="middle" style="padding-bottom: 3px;" alt="download datasheet" border="0" src="/content/dam/richtek-eds/resources/images/common/news/ic-download-2.png" ></a></div></td><td>2V to 80V</td><td>±2.5mV</td><td>±2%</td><td>20V/V</td><td>MSOP-8, SOP-8</td><td class="buy-col"><a href="https://www.digikey.com/en/products/result?s=N4IgTCBcDaIEoBUCKA2ADAVjSAugXyA" target="_blank"><img alt="Buy-on-Line" border="0" src="/content/dam/richtek-eds/resources/images/common/news/ic-cart.png" ></a></td></tr></tbody></table></div>
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针对消费类应用,我们也提供 RT6050、 RT6052、 RT6053和 RT6056作为选择。
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