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onkeydown="if(event.keyCode==13) {window.location=$('fj_btn').href;return false;}" title="跳转到指定楼层" /> <a href="javascript:;" id="fj_btn" class="z" title="跳转到指定楼层"><img src="static/image/common/fj_btn.png" alt="跳转到指定楼层" class="vm" /></a> </div> <strong> <a href="http://bbs.oecr.com/thread-72179-1-1.html" id="postnum465377" onclick="setCopy(this.href, '帖子地址复制成功');return false;"> <em>1</em>楼</a> </strong> <div class="pti"> <div class="pdbt"> </div> <div class="authi"> <img class="authicn vm" id="authicon465377" src="static/image/common/online_member.gif" /> <em id="authorposton465377">发表于 2008-7-9 12:43:57</em> <span class="pipe">|</span> <a href="http://bbs.oecr.com/forum.php?mod=viewthread&tid=72179&page=1&authorid=70939" rel="nofollow">只看该作者</a> <span class="none"><img src="static/image/common/arw_r.gif" class="vm" alt="回帖奖励" /></span> <span class="pipe show">|</span><a href="http://bbs.oecr.com/forum.php?mod=viewthread&tid=72179&extra=page%3D1&ordertype=1" class="show">倒序浏览</a> <span class="pipe show">|</span><a href="javascript:;" onclick="readmode($('thread_subject').innerHTML, 465377);" class="show">阅读模式</a> </div> </div> </div><div class="pct"><style type="text/css">.pcb{margin-right:0}</style><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_465377"> 新型高效率DC-DC电源转换器TPS54350<br /> TPS54350是德州仪器公司生产的新型高效率DC-DC电源转换器，集成了高端MOSFET<br /> 和一个可选的低端外部MOSFET门驱动器。<br /> （1）特性<br /> TPS54350采用了高性能电压误差放大器，可最大限度地提高瞬时条件下的性能，从而在<br /> 选择输出过滤电感器与电容器时提供最大的灵活性。在实际使用中，可以将TPS54350的开<br /> 关频率固定在250 kHz或500 kHz，也可将其调至高达700 kHz，以缩小无源组件的尺寸。<br /> TPS54350可支持高效率同步或低成本非同步操作，带有互动<a href="http://opticaldesign.oecr.com" target="_blank" class="relatedlink">软件</a>开发工具及可帮助电<br /> 源系统级设计人员满足快速设备开发周期要求的评估模块。目前，该软件可通过pow-<br /> er. ti. com/swift网站免费获得，该网站提供了大量的<a href="http://material.oecr.com" target="_blank" class="relatedlink">材料</a>清单、参考示意图、环路响应图<br /> 及根据设计人员的输人信息而生成的效率曲线。<br /> TPS54350的主要特性如下：<br /> 效率达90％以上；<br /> 输人电压范围为4．5~20 V;<br /> 输出电压可调低至0.891 V（精确度为1％）；<br /> 可编程外部时钟同步；<br /> 广泛的脉宽调制（PWM）频率（固定为250 kHz,500 kHz或250~700 kHz可调）；<br /> 负载受峰值限流（Peak Current Limit)与热关断保护；<br /> 具有内部软启动<a href="http://electronic.oecr.com" target="_blank" class="relatedlink">电路</a>。<br /> (2）内部电路与引脚功能<br /> TPS54350采用具有PowerPADTM的16引脚HTSSOP封装，可增强散热性能并节约空<br /> 间。TPS54350的内部电路框图如图所示，各引脚功能见表。<br /> <br /> <br /> (3）应用电路<br /> TPS54350可提供90%以上的效率，非常适用于低功耗的工业与商业、带有液晶<a href="http://display.oecr.com" target="_blank" class="relatedlink">显示</a>屏<br /> （LCD）的监视器与电视、硬盘驱动器、视频图像卡及9V或12 V墙式适配器的负载点稳压装置。<br /> TPS54350的典型应用电路如图所示。TPS54350输出负电源的电路如图所示。</td></tr></table> </div> <div id="comment_465377" class="cm"> </div> <div id="post_rate_div_465377"></div> </div> </div> </td></tr> <tr><td class="plc plm"> <div id="p_btn" class="mtw mbm hm cl"> <a href="http://club.oecr.com/home.php?mod=spacecp&ac=favorite&type=thread&id=72179&formhash=4dee6805" id="k_favorite" onclick="showWindow(this.id, this.href, 'get', 0);" 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