{"id":1815,"date":"2018-12-18T03:59:17","date_gmt":"2018-12-18T03:59:17","guid":{"rendered":""},"modified":"2018-12-18T11:59:42","modified_gmt":"2018-12-18T03:59:42","slug":"%e5%bc%80%e5%85%b3%e7%94%b5%e6%ba%90%e6%96%b9%e9%9d%a2%e7%9a%84%e5%ba%94%e7%94%a8%2cpwm%e4%bf%a1%e5%8f%b7%e7%9a%84%e4%ba%a7%e7%94%9f%e6%9c%ba%e5%88%b6","status":"publish","type":"post","link":"http:\/\/www.szryc.com\/?p=1815","title":{"rendered":"\u5f00\u5173\u7535\u6e90\u65b9\u9762\u7684\u5e94\u7528,PWM\u4fe1\u53f7\u7684\u4ea7\u751f\u673a\u5236"},"content":{"rendered":"

\n\t\u5728\u524d\u9762\u7684\u6587\u7ae0\u4e2d\u6211\u4eec\u7b80\u5355\u8bb2\u8ff0\u4e86PWM\u7684\u5de5\u4f5c\u539f\u7406\u5e76\u873b\u8713\u70b9\u6c34\u5730\u8bb2\u4e86\u5176\u5728DAC<\/u>\u3001LED\u8c03\u5149\u3001\u9a71\u52a8\u9a6c\u8fbe\u65b9\u9762\u7684\u5e94\u7528\uff0c\u6700\u540e\u6211\u4eec\u518d\u6765\u770b\u770b\u5176\u5728\u5f00\u5173\u7535\u6e90<\/u>\u65b9\u9762\u7684\u5e94\u7528\u3002<\/p>\n

\n\t\u6211\u4eec\u77e5\u9053\u5f00\u5173\u7535\u6e90\u5728\u73b0\u5728\u7684\u7535\u5b50\u4ea7\u54c1\u4e2d\u5927\u884c\u5176\u9053\uff0c\u4e3b\u8981\u7684\u539f\u56e0\u5c31\u662f\u5176\u652f\u6301\u7684\u8f93\u5165\u7535\u538b\u52a8\u6001\u8303\u56f4\u5bbd\u3001\u5728\u5f88\u5bbd\u7684\u8f93\u5165\u7535\u538b\u8303\u56f4\u5185\u90fd\u53ef\u4ee5\u505a\u5230\u8f83\u9ad8\u7684\u8f6c\u6362\u6548\u7387\uff0c\u4e5f\u5c31\u662f\u8bf4\u80fd\u91cf\u6d6a\u8d39\u76f8\u5bf9\u8f83\u5c11\uff0c\u4ece\u800c\u4e5f\u907f\u514d\u4e86\u7535\u8def\u677f\u7684\u8fc7\u70ed\u548c\u5668\u4ef6\/\u710a\u76d8\u7b49\u7684\u8fc5\u901f\u8001\u5316\u5bfc\u81f4\u5bff\u547d\u5927\u5e45\u7f29\u77ed\u3002\u540c\u7ebf\u6027\u7a33\u538b\u5668<\/u>\u4e09\u6781\u7ba1\u5de5\u4f5c\u5728\u7ebf\u6027\u72b6\u6001\u4e0d\u540c\u7684\u662f\uff0c\u5f00\u5173\u7a33\u538b\u5668<\/u>\u4e2d\u7684\u4e09\u6781\u7ba1\uff08\u5728\u8fd9\u91cc\u6211\u4eec\u5305\u62ecMOS\u7ba1\uff09\u5de5\u4f5c\u5728\u5f00\u5173\u72b6\u6001\uff0c\u8fd9\u4e5f\u662f“\u5f00\u5173\u7a33\u538b”\u540d\u5b57\u7684\u6765\u5386\u3002\u5982\u4e0b\u56fe\u6240\u793a\uff1a<\/p>\n

\n\t <\/div>\n

\n\t<\/p>\n

\n\t\u5f00\u5173\u7a33\u538b\u5668\u7684\u5de5\u4f5c\u539f\u7406\u793a\u610f\u56fe<\/p>\n

\n\t\u5f00\u5173\u7a33\u538b\u5668\u4e3b\u8981\u7531\u5de5\u4f5c\u4e8e\u5f00\u5173\u72b6\u6001\u7684\u4e09\u6781\u7ba1+\u50a8\u80fd\u7684\u7535\u611f+\u7535\u5bb9<\/u>\u6784\u6210\uff1a<\/p>\n

\n\t\u5de5\u4f5c\u4e8e\u5f00\u5173\u6a21\u5f0f\u7684\u4e09\u6781\u7ba1\uff1aOn\u7684\u65f6\u5019\u5bf9\u7535\u611f\u5145\u7535\uff0c\u5145\u7535\u8db3\u591f\u7684\u65f6\u5019\u5f00\u5173\u5173\u95ed\uff0c\u7535\u611f\u7ebf\u5708\u5c06\u80fd\u91cf\u4ee5\u7535\u6d41<\/u>\u7684\u65b9\u5f0f\u5f80\u8d1f\u8f7d\u4f9b\u7535\uff0c\u8f93\u51fa\u7535\u5bb9\u540c\u7535\u611f\u4e00\u8d77\u4fdd\u8bc1\u7535\u538b\u7684\u7a33\u5b9a\u3002\u7406\u8bba\u4e0a\u5f53\u4e09\u6781\u7ba1\u5904\u4e8eOn\u7684\u65f6\u5019\u5176\u6ca1\u6709\u538b\u964d\uff0c\u5904\u4e8eOff\u7684\u65f6\u5019\u6ca1\u6709\u7535\u6d41\u901a\u8fc7\uff0c\u6240\u4ee5\u53ef\u4ee5\u8fbe\u5230\u6bd4\u8f83\u9ad8\u7684\u8f6c\u6362\u6548\u7387\u3002\u4f46\u5b9e\u9645\u4e0a\u5176\u8fd8\u662f\u6709\u538b\u964d\u548c\u7535\u6d41\u901a\u8fc7\u7684\uff0c\u5e76\u4e14\u8fd8\u6709\u5176\u5b83\u5668\u4ef6\u4e0a\u7684\u635f\u8017\uff1b<\/p>\n

\n\t\u7535\u611f\uff1a\u7535\u6d41\u6d41\u5165\u7684\u65f6\u5019\u901a\u8fc7\u78c1\u573a\u5b58\u50a8\u80fd\u91cf\uff0c\u5b83\u4e0d\u559c\u6b22\u7535\u6d41\u7684\u53d8\u5316\uff0c\u4f1a\u5c3d\u529b\u4fdd\u6301\u7535\u6d41\u4e3a\u5e38\u6570\u800c\u8fbe\u5230\u5e73\u6ed1\u7535\u6d41\u7684\u4f5c\u7528\uff1b<\/p>\n

\n\t\u7535\u5bb9\uff1a\u53ef\u4ee5\u770b\u4f5c\u4e3a\u7535\u538b\u6ee4\u6ce2\u5668<\/u>\uff0c\u5b83\u4e0d\u559c\u6b22\u7535\u538b\u7684\u53d8\u5316\uff0c\u7528\u5176\u5b58\u50a8\u7684\u80fd\u91cf\u6765\u4fdd\u6301\u7535\u538b\u4e3a\u5e38\u6570\u3002<\/p>\n

\n\t\u7528\u4e8e\u63a7\u5236\u4e09\u6781\u7ba1\u5f00\u3001\u5173\u4ece\u800c\u8c03\u6574\u8f93\u51fa\u7535\u538b\u7684\u4fe1\u53f7\u4e3b\u8981\u91c7\u7528\u7684\u5c31\u662fPWM\u4fe1\u53f7\uff0c\u6709\u7684\u5668\u4ef6\u5219\u6839\u636e\u8d1f\u8f7d\u7684\u60c5\u51b5\u7075\u6d3b\u4f7f\u7528PWM\u548cPFM\uff08\u8109\u51b2\u9891\u7387\u8c03\u5236 - \u56fa\u5b9a\u5360\u7a7a\u6bd4\uff0c\u6539\u53d8\u8109\u51b2\u7684\u91cd\u590d\u9891\u7387\uff09\u3002\u63a7\u5236\u4e09\u6781\u7ba1\u5f00\u3001\u5173\u7684PWM\u4fe1\u53f7\u54ea\u91cc\u6765\u7684\u5462\uff1f\u770b\u4e0b\u9762\u7684\u56fe - \u8f93\u51fa\u7aef\uff08\u4f9b\u7ed9\u8d1f\u8f7d\uff09\u7684\u76f4\u6d41\u7535\u538b\u8fdb\u884c\u5206\u538b\u4ee5\u540e\u4e0e\u5668\u4ef6\u5185\u7f6e\u7684\u53c2\u8003\u7535\u538b\uff08\u4e00\u822c\u79f0\u4e3aBandgap Reference\uff09\u76f8\u6bd4\u8f83\uff0c\u5982\u679c\u8f93\u51fa\u7535\u538b\u5206\u538b\u540e\u7684\u7535\u538b\u4e0e\u53c2\u8003\u7535\u538b\u6709\u8bef\u5dee\uff0c\u5219\u6bd4\u8f83\u7535\u8def\u8f93\u51fa\u76f8\u5e94\u7684\u8bef\u5dee\u4fe1\u53f7\u63a7\u5236PWM\u4ea7\u751f\u7535\u8def\u4ea7\u751f\u7528\u4e8e\u63a7\u5236\u4e09\u6781\u7ba1\u5f00\u3001\u5173\u7684\u63a7\u5236\u4fe1\u53f7\uff0cPWM\u7684\u5360\u7a7a\u6bd4\u4e0e\u8bef\u5dee\u7535\u538b\u7684\u5927\u5c0f\u6210\u4e00\u5b9a\u7684\u6bd4\u4f8b\uff0c\u8fd9\u6837\u5c31\u6784\u6210\u4e86\u4e00\u4e2a\u7a33\u5b9a\u6536\u655b\u7684\u53cd\u9988\u73af\u8def\uff0c\u6700\u540e\u8fbe\u5230\u8f93\u51fa\u7535\u538b\u7684\u5206\u538b\u4e0e\u53c2\u8003\u7535\u538b\u76f8\u7b49\uff0c\u4ece\u800c\u8bef\u5dee\u6700\u5c0f\u3002<\/p>\n

\n\t<\/p>\n

\n\tPWM\u4fe1\u53f7\u7684\u4ea7\u751f\u673a\u5236<\/p>\n

\n\t\u7531\u4e8e\u5de5\u4f5c\u5728\u5f00\u5173\u6a21\u5f0f\uff0c\u50a8\u80fd\u7684\u7535\u611f\u548c\u5e73\u6ed1\u7535\u5bb9\u7684\u53cd\u5e94\u90fd\u9700\u8981\u65f6\u95f4\uff0c\u56e0\u6b64\u8f93\u51fa\u7535\u538b\u4e0a\u4e00\u5b9a\u4f1a\u5b58\u5728\u7740\u6ce2\u52a8\uff0c\u4e5f\u5c31\u662f\u8bef\u5dee\u7535\u538b\u4e5f\u4f1a\u5728\u5f88\u5c0f\u8303\u56f4\u5185\u6ce2\u52a8\uff0cPWM\u7684\u5360\u7a7a\u6bd4\u4e5f\u5728\u6296\u52a8\uff0c\u4f46\u5728\u4e00\u5b9a\u7684\u8303\u56f4\u5185\uff0c\u8fd9\u4e9b\u6ce2\u52a8\u90fd\u4e0d\u4f1a\u5f71\u54cd\u5230\u73af\u8def\u7684\u7a33\u5b9a\u5de5\u4f5c\u3002<\/p>\n

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\n\t\u5f00\u5173\u7a33\u538b\u5668\u7684\u4f18\u70b9\uff1a<\/p>\n

\n\t\u6548\u7387\u6bd4\u8f83\u9ad8\uff0c\u76f8\u5bf9\u6bd4\u5e38\u89c4\u7684\u7ebf\u6027\u7a33\u538b\u5668\uff0c\u4e00\u822c\u6765\u8bb2\u5176\u6548\u7387\u662f\u6bd4\u8f83\u9ad8\u7684\uff0c\u4f46\u4e5f\u4f1a\u6709\u4e00\u4e9b\u7531\u4e8e\u5668\u4ef6\u7684\u975e\u7406\u60f3\u5316\u5e26\u6765\u4e00\u4e9b\u635f\u8017\uff0c\u5728\u4e00\u4e2a\u5b9e\u9645\u7684\u7cfb\u7edf\u4e2d\u5f00\u5173\u7a33\u538b\u5668\u6548\u7387\u662f\u5426\u4e00\u5b9a\u9ad8\u4e8eLDO<\/u>\uff08\u8f93\u5165\u8f93\u51fa\u538b\u5dee\u8f83\u4f4e\u7684\u4e00\u79cd\u7ebf\u6027\u7a33\u538b\u5668\uff09\uff0c\u9700\u8981\u6839\u636e\u5b9e\u9645\u7684\u7535\u538b\u3001\u7535\u6d41\u60c5\u51b5\u6765\u5206\u6790\u3001\u9009\u7528\uff1b<\/p>\n

\n\t\u8f93\u5165\u7535\u538b\u8303\u56f4\u8f83\u5bbd - \u5168\u7403\u8dd1\u5230\u4efb\u4f55\u5730\u65b9\u90fd\u80fd\u7528\u7684\u7b14\u8bb0\u672c\u7535\u6e90\u9002\u914d\u5668\u3001\u522e\u80e1\u5200\u3001\u624b\u673a\u5145\u7535\u5668\u7b49\u7b49\u90fd\u662f\u7528\u5f00\u5173\u7a33\u538b\u7684\u65b9\u5f0f\u5b9e\u73b0\u7684\uff0c\u7ebf\u6027\u7a33\u538b\u5668\u5728\u8fd9\u79cd\u9700\u6c42\u4e0b\u65e0\u80fd\u4e3a\u529b\u7684\uff1b<\/p>\n

\n\t\u540c\u7b49\u529f\u7387\u4e0b\uff0c\u5c24\u5176\u662f\u5927\u529f\u7387\uff0c\u5f00\u5173\u7a33\u538b\u5668\u7684\u4f53\u79ef\u53ef\u4ee5\u505a\u7684\u8f83\u5c0f\uff0c\u8fd9\u5f97\u76ca\u4e8e\u5f00\u5173\u5de5\u4f5c\u9891\u7387\u7684\u63d0\u9ad8\uff0c\u6709\u7684\u9ad8\u8fbe\u51e0MHz\uff0c\u5668\u4ef6\u4f53\u79ef\u53ef\u4ee5\u53d8\u5f97\u5f88\u5c0f\u3002<\/p>\n

\n\t\u5f00\u5173\u7a33\u538b\u5668\u7684\u7f3a\u70b9\uff1a<\/p>\n

\n\t\u76f8\u5bf9\u4e8e\u4e09\u4ef6\u5957\u7684\u7ebf\u6027\u7a33\u538b\u5668\uff0c\u5f00\u5173\u7a33\u538b\u5668\u9700\u8981\u7684\u5143\u5668\u4ef6\u6bd4\u8f83\u591a\uff0c\u6709\u7684\u5668\u4ef6\u76f8\u5bf9\u8fd8\u6bd4\u8f83\u5927\uff0c\u6bd4\u5982\u7ebf\u5708\u3001\u7535\u5bb9\uff1b<\/p>\n

\n\t\u9ad8\u9891\u7684\u5f00\u5173\u566a\u58f0\u6bd4\u8f83\u5927\uff0c\u5143\u5668\u4ef6\u7684\u5e03\u5c40\u6bd4\u8f83\u5173\u952e\uff0c\u5b9e\u73b0\u7cfb\u7edf\u9700\u8981\u7684\u4f4e\u566a\u58f0\u662f\u975e\u5e38\u5177\u6709\u6311\u6218\u7684\uff1b<\/p>\n

\n\t\u5143\u5668\u4ef6\u7684\u9009\u7528\u4e5f\u975e\u5e38\u5173\u952e\uff0c\u6bd4\u5982MOS\u7ba1\u3001\u50a8\u80fd\u7535\u611f\u3001\u5e73\u6ed1\u7535\u5bb9\u7b49<\/p>\n

\n\t\u5f00\u5173\u7a33\u538b\u5668\u4e5f\u6709\u4e0d\u540c\u7684\u7c7b\u578b\uff0c\u6839\u636e\u8f93\u5165\u7535\u538b\u548c\u8f93\u51fa\u7535\u538b\u7684\u5173\u7cfb\u5206\uff1a<\/p>\n

\n\tBuck\u578b - \u964d\u538b<\/p>\n

\n\tBoost\u578b - \u5347\u538b<\/p>\n

\n\tBuck+Boost - \u65e2\u53ef\u4ee5\u5347\u538b\u4e5f\u53ef\u4ee5\u964d\u538b<\/p>\n","protected":false},"excerpt":{"rendered":"

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