| DN458降压转换器简化低电压设计 | |
| 所屬分類(lèi)：电路图 | |
| 上傳者：serena | |
| 標(biāo)簽： 降压转换器 DN458 | |
| 所需積分：1分積分不夠怎么辦？ | |
| 文檔介紹： 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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