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R7780 是一款高性能、电流模式、有高压启动元件整合在内的 PWM 控制器。在启动过程中,为能有快速启动,电流源通过整合的高压元件对 VDD 电容器充电,而它在一般正常操作时是不会消耗功率的。R7780 提供用户一个优异的、有更高效率、少量外部元件、低成本解决方案的 AC/DC 电源应用。</br>在微小型 SOP-7 封装之下,它还具有频率抖动,欠压锁定 (UVLO),前缘遮蔽 (LEB),内部斜率补偿等特点。它提供了过温保护 (OTP),过负载保护 (OLP),和过压保护 (OVP) 等完整的保护。</br>此外,它也提供了当转换器处于睡眠模式时,零功率应用的一种特殊介面。 EN/DIS 接脚从次级纯量控制器接收 ON/OFF 信号。在电源关闭时,控制器可完全关闭,只需相当低的功耗。
R7780 电路图
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<div class="spec-list"><ul class="lv1"><li>整合的高压启动元件 </li><li>启用 / 停用 (ENABLE/DISABLE) 功能 </li><li>9V/16.5V欠压锁定 (UVLO) </li><li>电流模式控制 </li><li>内建 65kHz 操作频率 </li><li>内建可抖动的频率 </li><li>内部 PWM 前缘遮没 </li><li>内部斜率补偿 </li><li>补偿三重丛发模式 </li><li>逐周期电流限制 </li><li>内部自动还原过压保护 (OVP) </li><li>内部自动还原超载保护 (OLP) </li><li>内部自动还原过温保护 (OTP) </li><li>CS 接脚开路保护 </li><li>次级整流器短路保护 </li><li>抑制电磁干扰的软启动 </li><li>高杂讯抗扰性 </li><li>符合RoHS标准及不含卤素 </li></ul></div>
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R7780 订购信息
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<div class="spec-list"><ul class="lv1"><li>ACDC 变压器 </li><li>电视和显示器应用 </li><li>低待机功耗家电 </li></ul></div>
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