DN458降压转换器简化低电压设计AET-电子技术应用-最丰富的电子设计资源平台

DN458降压转换器简化低电压设计
所属分类：电路图
上传者：serena
标签：降压转换器 DN458
所需积分：1分积分不够怎么办？
文档介绍：Many system designers need an easy way to producea negative 3.3V power supply. In systems that alreadyhave a transformer, one option is to swap out the existingtransformer with one that has an additional secondarywinding. The problem with this solution is that manysystems now use transformers that are standard, offthe-shelf components, and most designers want toavoid replacing a standard, qualifi ed transformer with acustom version. An easier alternative is to produce thelow negative voltage rail by stepping down an existingnegative rail. For example, if the system already employsan off-the-shelf transformer with two secondary windingsto produce 12V, and a 3.3V rail is needed, a negativebuck converter can produce the 3.3V output from the12V rail.
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