{"id":5205,"date":"2017-12-21T00:01:03","date_gmt":"2017-12-20T15:01:03","guid":{"rendered":"http:\/\/micro.rohm.com\/cn\/techweb\/?p=5205"},"modified":"2021-12-02T16:55:30","modified_gmt":"2021-12-02T08:55:30","slug":"%e9%80%9a%e8%bf%87%e6%8e%a7%e5%88%b6%e4%b8%80%e6%ac%a1%e4%be%a7-%e4%bd%bf%e4%ba%8c%e6%ac%a1%e4%be%a7%e7%a8%b3%e5%ae%9a%e7%9a%84%e6%89%8b%e6%b3%95","status":"publish","type":"post","link":"https:\/\/techclass.wfjydl.com\/tech-info\/engineer\/5115","title":{"rendered":"\u901a\u8fc7\u63a7\u5236\u4e00\u6b21\u4fa7 \u4f7f\u4e8c\u6b21\u4fa7\u7a33\u5b9a\u7684\u624b\u6cd5"},"content":{"rendered":"<p 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class=\"fr\" style=\"width:335px;\">\n\t\t<img loading=\"lazy\" decoding=\"async\" src=\"\/upload\/2017\/12\/flyback_new1.gif\" width=\"335\" height=\"302\" alt=\"flyback_new1\">\n\t<\/div>\n<\/div>\n<p>\u9996\u5148\uff0c\u4e0b\u9762\u662f\u57fa\u672c\u516c\u5f0f\u3002V<sub>SW<\/sub>\u662fSW\u5f15\u811a\u7684\u53cd\u6fc0\u7535\u538b\u3002\u7ed9\u524d\u9762\u7684\u7b80\u5316\u516c\u5f0f\u6dfb\u52a0\u4e86\u201cI<sub>S<\/sub>\u00d7ESR\u201d\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"\/upload\/2017\/12\/fom0.gif\" width=\"305\" height=\"121\" alt=\"fom0\"><\/p>\n<p>V<sub>SW<\/sub>\u901a\u8fc7\u7535\u963bR<sub>FB<\/sub>\u8f6c\u6362\u4e3a\u7535\u6d41I<sub>RFB<\/sub>\u3002FB\u5f15\u811a\u7684\u7535\u538bV<sub>FB<\/sub>\u5229\u7528\u4e0eV<sub>IN<\/sub>\u7684\u5dee\u5206\u7535\u8def\u8fbe\u5230\u4e0eV<sub>IN<\/sub>\u51e0\u4e4e\u76f8\u7b49\u7684\u7535\u538b\u3002\u8bf7\u8bb0\u4f4f\u8be5\u5de5\u4f5c\u662f\u73af\u8def\u63a7\u5236\uff0c\u4e0e\u8fd0\u7b97\u653e\u5927\u5668\u7684\u5dee\u5206\u7535\u8def\u601d\u8def\u76f8\u540c\u3002\u7528\u516c\u5f0f\u8868\u793aI<sub>RFB<\/sub>\u5982\u4e0b\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"\/upload\/2017\/12\/fom1.gif\" width=\"305\" height=\"152\" alt=\"fom1\"><\/p>\n<p>\u53ef\u4ee5\u770b\u51fa\uff0cV<sub>FB<\/sub>\u2252V<sub>IN<\/sub>\uff0c\u56e0\u6b64V<sub>SW<\/sub>\u51cf\u53bbV<sub>IN<\/sub>\uff08V<sub>FB<\/sub>\uff09\u540e\u7684\u7535\u538b\u9664\u4ee5R<sub>FB<\/sub>\uff0c\u5373\u7b49\u4e8eI<sub>RFB<\/sub>\u3002\u8fd9\u6837\uff0c\u516c\u5f0f\u4e2d\u51fa\u73b0\u4e86V<sub>OUT<\/sub>\u9879\u3002\u4e0b\u9762\u6765\u6c42V<sub>OUT<\/sub>\u3002<\/p>\n<p>\u7531\u4e8e\u8fd9\u4e2aI<sub>RFB<\/sub>\u6d41\u8fc7\u7535\u963bR<sub>REF<\/sub>\uff0c\u56e0\u6b64REF\u5f15\u811a\u7684\u7535\u538bV<sub>REF<\/sub>\u7684\u516c\u5f0f\u5982\u4e0b\u3002<br \/>\nI<sub>RFB<\/sub>\u5df2\u7ecf\u5c55\u5f00\u4e86\uff0c\u6536\u56de\u540e\u5f53\u7136\u5c31\u662fV<sub>REF<\/sub>\uff1dR<sub>REF<\/sub>\u00d7I<sub>RFB<\/sub>\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"\/upload\/2017\/12\/fom2.gif\" width=\"439\" height=\"75\" alt=\"fom2\"><\/p>\n<p>\u8bf7\u770b\u65b9\u6846\u56fe\u3002REF\u5f15\u811a\u7684\u7535\u538b\u88ab\u8f93\u5165IC\u5185\u90e8\u6bd4\u8f83\u5668\u7684\u975e\u53cd\u76f8\u5f15\u811a\uff0c\u5e76\u4e0e\u53cd\u76f8\u5f15\u811a\u7684\u57fa\u51c6\u7535\u538b\uff080.78V\uff09\u8fdb\u884c\u6bd4\u8f83\u3002\u4e00\u822c\u7684\u63a7\u5236IC\u4e2d\uff0c\u8fd9\u91cc\u662f\u8bef\u5dee\u653e\u5927\u5668\uff0c\u4f46\u5728\u8fd9\u6b3eIC\u4e2d\u662f\u4f7f\u7528\u4e86\u6bd4\u8f83\u5668\u7684\u63a7\u5236\u65b9\u5f0f\uff0c\u56e0\u6b64\u662f\u6bd4\u8f83\u5668\u3002\u601d\u8def\u4e0e\u8bef\u5dee\u653e\u5927\u5668\u76f8\u540c\uff0cREF\u5f15\u811a\uff08\u6bd4\u8f83\u5668\u7684\u53cd\u76f8\u8f93\u5165\uff09\u7684\u7535\u538b\u7b49\u4e8e\u57fa\u51c6\u7535\u538b\uff080.78V\uff09\u3002\u6240\u4ee5\uff0c\u8f93\u51fa\u7535\u538bV<sub>OUT<\/sub>\u548cREF\u5f15\u811a\u7684\u7535\u538bV<sub>REF<\/sub>\u7684\u5173\u7cfb\u5982\u4e0b\u5217\u516c\u5f0f\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"\/upload\/2017\/12\/fom3.gif\" width=\"297\" height=\"42\" alt=\"fom3\"><\/p>\n<p>\u4e5f\u5c31\u662f\u8bf4\uff0c\u8f93\u51fa\u7535\u538bV<sub>OUT<\/sub>\u7531\u53d8\u538b\u5668\u7684\u531d\u6570\u6bd4\u3001R<sub>FB<\/sub>\u548cR<sub>REF<\/sub>\u7684\u7535\u963b\u6bd4\u51b3\u5b9a\u3002V<sub>F<\/sub>\u548cI<sub>S<\/sub>\u00d7ESR\u662f\u5f15\u53d1\u8f93\u51fa\u7535\u538b\u8bef\u5dee\u7684\u56e0\u7d20\u3002<\/p>\n<p 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