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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-tw_image001.jpg" /></p>

精確的電流監控不僅是電路保護的基礎,更是提升系統效能與能源管理效率的關鍵。透過電流感測技術,系統能即時掌握功耗變化,實現過電流保護、動態效率調整與遠端監控等功能。電流感測放大器依架構可分為兩大類:

  • 數位型:可輸出完整的電壓、電流與功率數據,並支援 I2C、SMBus 介面,特別適合待機管理與資料分析需求。
  • 類比型:反應速度快、電路簡潔,適合即時回饋與保護應用。

<br>為滿足多樣化應用需求,立錡科技推出多款高精度電流感測放大器,涵蓋數位型 RTQ6132 / RTQ6134 / RTQ6136、 RTQ6059、 RTQ6053/ RTQ6056,以及類比型 RTQ6060A/RTQ6060B、 RTQ6050/RTQ6052等產品系列,提供廣泛電壓範圍與多種精度等級,協助系統設計人員快速打造最合適的電源監控解決方案。

應用範例

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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">應用</th><th scope="col">說明</th></tr></thead><tbody><tr><th scope="row">伺服器</th><td>在數據中心應用中,電流感測放大器用於電源監控、能效優化與遠端診斷。RTQ6136 專為 48V 系統設計,具 75V AMR 共模電壓能力,滿足高可靠度電源監控需求。</td></tr><tr><th scope="row">USB Power Delivery (USB PD)</th><td>透過精確電流監控,確保充電安全並提升效率。<a href="https://www.richtek.com/RedirectToProduct?specid=RTQ6059&amp;utm_source=Newsletter&amp;utm_medium=RTWWW&amp;utm_campaign=Issue55TW&amp;sc_lang=zh-TW" target="_blank" style="text-decoration: none; color: #37a6d9;font-size: 1.1rem;"> RTQ6059</a> 具兩個位址選擇腳位,可設定多達 16 組不同位址,適用於單一 Embedded Controller,管理多個 USB 埠的多埠 PD 系統。</td></tr><tr><th scope="row">PoE 以太網供電</th><td>電流感測可判斷 PD 類型與功率需求,動態分配總功率以防止多 PD 系統過載。可選用具低壓檢測功能的<a href="https://www.richtek.com/RedirectToProduct?specid=RTQ6056&amp;utm_source=Newsletter&amp;utm_medium=RTWWW&amp;utm_campaign=Issue55TW&amp;sc_lang=zh-TW" target="_blank" style="text-decoration: none; color: #37a6d9;font-size: 1.1rem;"> RTQ6056</a>,配置於低壓端監控 PoE 輸入並協助系統控制。</td></tr><tr><th scope="row">桌上型電腦</th><td>即時監控輸入電流以提升系統效能與可靠性,並降低設計風險。<a href="https://www.richtek.com/RedirectToProduct?specid=RTQ6060&amp;utm_source=Newsletter&amp;utm_medium=RTWWW&amp;utm_campaign=Issue55TW&amp;sc_lang=zh-TW" target="_blank" style="text-decoration: none; color: #37a6d9;font-size: 1.1rem;"> RTQ6060</a> 可作為主要電源監控元件,快速回報電流變化給 Embedded Controller,讓系統能即時調整運作參數。</td></tr></tbody></table></div>
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電流感測技術已成為電源管理與系統設計中不可或缺的一環,立錡提供完整的電流感測放大器產品組合,打造更可靠系統。
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閱讀應用筆記
/content/richtek-eds/zh-tw/design-support/application-notes/an091
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數位型

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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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類比型

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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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針對消費型應用,我們也提供 RT6050、 RT6052、 RT6053與 RT6056作選擇。
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