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Product Spec Banner
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RT7781系列为强化高效能电流模式脉波宽度调变(PWM)之返驰式转换控制器，并加入零功率损耗(PowerZeroTM)专利技术于控制器中。创新的零功率损耗技术尤其在输出轻载及空载提供了出色的节能解决方法，以及其它四个主要节能功能：移除X电容泄放电阻(BRR)技术的设计用来当交流输入电源移除时，X电容电压可经由IC内部的高压装置泄放到地，所以X电容泄放电阻可以移除。此外，结合高压装置也可以提供快速的启动功能，无须在外部使用启动电阻。内建无损耗Brown-In(BRI) 及Brown-Out(BRO)功能无须外部分压侦测电阻，不仅可以减少外部零件数，同时可以降低功率损耗。四模式脉波宽度调变控制器提供了降频模式和高载模式(Burst Mode)来达成节能要求。RT7781提供完整安全的电源供应器保护机制，包括过温度保护(OTP)、超载保护(OLP)、过压保护(OVP)、次级侧整流器短路保护(SRSP)以及电流检测引脚开路保护。RT7781提供了几个版本应用，展示于RT7781版本表格中。笔记本电脑电源转接器的应用中，RT7781提供用户一高效率、低外部零件数及低成本的AC/DC电源供应器。
RT7781 电路图
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basicInfoImageSection
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<div class="spec-list"><ul class="lv1"><li>具专利之零功率损耗技术(PowerZeroTM) </li><li>结合700V 启动装置 </li><li>免X 电容泄放电阻(BRR) </li><li>无损耗Brown-In (LBI)及Brown-Out (LBO) </li><li>四重模式脉波宽度调变操作 </li><li>空载输入功率小于50mW (RT7781G/L/A/C) </li><li>空载输入功率小于30mW (RT7781T) </li><li>精准的超载保护 </li><li>驱动能力：400mA/-400mA </li><li>嵌入保护引脚(PRO Pin)设计作为外部应用保护(RT7781G/L/A/C) </li><li>内建ACD 引脚作为电视应用(RT7781C) </li><li>禁能(Disable)模式作为30mW 解决方案(RT7781T) </li><li>软启动功能 </li><li>内建抖频技术 </li><li>软盘机动改善电磁干扰 </li><li>VDD 过压保护 </li><li>内部过温度保护 </li><li>次级侧整流器短路保护 </li><li>电流检测引脚开路保护 </li><li>符合有害物质及无卤素标准规定 </li></ul></div>
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productFeatureSection
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RT7781 订购信息
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RT7781
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RT7781
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<div class="spec-list"><ul class="lv1"><li>笔记型电脑电源转接器 </li><li>低空载输入功率切换式 AC/DC 电源转接器 </li><li>电视及监视器应用 </li><li>开架式电源供应器 </li></ul></div>
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