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Product Spec Banner
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RT7781系列為強化高效能電流模式脈波寬度調變(PWM)之返馳式轉換控制器，並加入零功率損耗(PowerZeroTM)專利技術於控制器中。創新的零功率損耗技術尤其在輸出輕載及空載提供了出色的節能解決方法，以及其它四個主要節能功能：移除X電容泄放電阻(BRR)技術的設計用來當交流輸入電源移除時，X電容電壓可經由IC內部的高壓裝置泄放到地，所以X電容泄放電阻可以移除。此外，結合高壓裝置也可以提供快速的啟動功能，無須在外部使用啟動電阻。內建無損耗Brown-In(BRI) 及Brown-Out(BRO)功能無須外部分壓偵測電阻，不僅可以減少外部零件數，同時可以降低功率損耗。四模式脈波寬度調變控制器提供了降頻模式和高載模式(Burst Mode)來達成節能要求。RT7781提供完整安全的電源供應器保護機制，包括過溫度保護(OTP)、超載保護(OLP)、過壓保護(OVP)、次級側整流器短路保護(SRSP)以及電流檢測引腳開路保護。RT7781提供了幾個版本應用，展示於RT7781版本表格中。筆記本電腦電源轉接器的應用中，RT7781提供用戶一高效率、低外部零件數及低成本的AC/DC電源供應器。
RT7781 電路圖
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<div class="spec-list"><ul class="lv1"><li>具專利之零功率損耗技術(PowerZeroTM) </li><li>結合700V 啟動裝置 </li><li>免X 電容泄放電阻(BRR) </li><li>無損耗Brown-In (LBI)及Brown-Out (LBO) </li><li>四重模式脈波寬度調變操作 </li><li>空載輸入功率小於50mW (RT7781G/L/A/C) </li><li>空載輸入功率小於30mW (RT7781T) </li><li>精準的超載保護 </li><li>驅動能力：400mA/-400mA </li><li>嵌入保護引腳(PRO Pin)設計作為外部應用保護(RT7781G/L/A/C) </li><li>內建ACD 引腳作為電視應用(RT7781C) </li><li>禁能(Disable)模式作為30mW 解決方案(RT7781T) </li><li>軟啟動功能 </li><li>內建抖頻技術 </li><li>軟盤機動改善電磁干擾 </li><li>VDD 過壓保護 </li><li>內部過溫度保護 </li><li>次級側整流器短路保護 </li><li>電流檢測引腳開路保護 </li><li>符合有害物質及無鹵素標準規定 </li></ul></div>
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RT7781 訂購資訊
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RT7781
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RT7781
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<div class="spec-list"><ul class="lv1"><li>筆記型電腦電源轉接器 </li><li>低空載輸入功率切換式 AC/DC 電源轉接器 </li><li>電視及監視器應用 </li><li>開架式電源供應器 </li></ul></div>
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