{"id":2936,"date":"2020-01-02T03:45:40","date_gmt":"2020-01-02T03:45:40","guid":{"rendered":""},"modified":"2020-01-02T11:46:11","modified_gmt":"2020-01-02T03:46:11","slug":"%e6%9d%bf%e8%bd%bd%e7%94%b5%e6%ba%90%e8%ae%be%e8%ae%a1%e9%9c%80%e9%81%b5%e5%be%aa%e5%93%aa%e4%ba%9b%e8%a6%81%e6%b1%82%e8%a7%84%e8%8c%83","status":"publish","type":"post","link":"http:\/\/www.szryc.com\/?p=2936","title":{"rendered":"\u677f\u8f7d\u7535\u6e90\u8bbe\u8ba1\u9700\u9075\u5faa\u54ea\u4e9b\u8981\u6c42\u89c4\u8303"},"content":{"rendered":"
\n\t\u70ed\u62d4\u63d2\u7cfb\u7edf\u5fc5\u987b\u4f7f\u7528\u7535\u6e90\u7f13\u542f\u52a8\u8bbe\u8ba1\uff0c\u70ed\u62d4\u63d2\u7cfb\u7edf\u5728\u5355\u677f\u63d2\u5165\u77ac\u95f4\uff0c\u5355\u677f\u4e0a\u7684\u7535\u5bb9<\/u>\u5f00\u59cb\u5145\u7535\u3002\u56e0\u4e3a\u7535\u5bb9\u4e24\u7aef\u7684\u7535\u538b\u4e0d\u80fd\u7a81\u53d8\uff0c\u4f1a\u5bfc\u81f4\u6574\u4e2a\u7cfb\u7edf\u7684\u7535\u538b\u77ac\u95f4\u8dcc\u843d\u3002\u540c\u65f6\u56e0\u4e3a\u7535\u6e90\u963b\u6297<\/u>\u5f88\u4f4e\uff0c\u5145\u7535\u7535\u6d41<\/u>\u4f1a\u975e\u5e38\u5927\uff0c\u5feb\u901f\u7684\u5145\u7535\u4f1a\u5bf9\u7cfb\u7edf\u4e2d\u7684\u7535\u5bb9\u4ea7\u751f\u51b2\u51fb\uff0c\u6613\u5bfc\u81f4\u94bd\u7535\u5bb9<\/u>\u5931\u6548\u3002<\/span><\/p>\n \n\t\u5982\u679c\u7cfb\u7edf\u4e2d\u91c7\u7528\u4fdd\u9669\u4e1d<\/u>\u8fdb\u884c\u8fc7\u6d41\u4fdd\u62a4\uff0c \u77ac\u6001\u7535\u6d41\u6709\u53ef\u80fd\u5bfc\u81f4\u4fdd\u9669\u4e1d\u7194\u65ad\uff0c \u800c\u9009\u62e9\u5927\u7535\u6d41\u7684\u4fdd\u9669\u4e1d\u4f1a\u4f7f\u5f97\u5728\u7cfb\u7edf\u7535\u6d41\u5f02\u5e38\u65f6\u53ef\u80fd\u4e0d\u7194\u65ad\uff0c\u8d77\u4e0d\u5230\u4fdd\u62a4\u4f5c\u7528\u3002\u6240\u4ee5\uff0c\u5728\u70ed\u62d4\u63d2\u7cfb\u7edf\u4e2d\u7535\u6e90\u5fc5\u987b\u91c7\u7528\u7f13\u542f\u52a8\u8bbe\u8ba1\uff0c\u9650\u5236\u542f\u52a8\u7535\u6d41\uff0c\u907f\u514d\u77ac\u6001\u7535\u6d41\u8fc7\u5927\u5bf9\u7cfb\u7edf\u5de5\u4f5c\u548c\u5668\u4ef6\u53ef\u9760\u6027\u4ea7\u751f\u5f71\u54cd\u3002<\/p>\n \n\t1\u3001LDO<\/u><\/p>\n \n\t\u5728\u538b\u5dee\u8f83\u5927\u6216\u8005\u7535\u6d41\u8f83\u5927\u7684\u964d\u538b\u7535\u6e90\u8bbe\u8ba1\u4e2d\uff0c\u5efa\u8bae\u91c7\u7528\u5f00\u5173\u7535\u6e90<\/u>\uff0c\u907f\u514d\u4f7f\u7528 LDO\u91c7\u7528\u7ebf\u6027\u7535\u6e90\uff08\u5305\u62ec LDO\uff09\u53ef\u4ee5\u5f97\u5230\u8f83\u4f4e\u7684\u566a\u58f0\uff0c\u800c\u4e14\u56e0\u4e3a\u4f7f\u7528\u7b80\u5355\uff0c\u6210\u672c\u4f4e\uff0c\u6240\u4ee5\u5728\u5355\u677f\u4e0a\u5e94\u7528\u8f83\u591a\u3002FPGA<\/u> \u5185\u6838\u7535<\/u>\u6e90\u3001\u67d0\u4e9b\u7535\u8def\u677f<\/u>\u4e0a\u5c04\u9891<\/u>\u65f6\u949f<\/u>\u90e8\u5206\u7684\u7535\u6e90\u7b49\u90fd\u4f7f\u7528\u7ebf\u6027\u7535\u6e90\u4ece\u66f4\u9ad8\u7535\u538b\u7684\u7535\u6e90\u4e0a\u8c03\u6574\u5f97\u5230\u3002\u7ebf\u6027\u7535\u6e90\u7684\u57fa\u672c\u539f\u7406\u5982\u56fe\u6240\u793a\u3002<\/span><\/p>\n \n\t\u8f93\u51fa\u7535\u538b\u7ecf\u8fc7\u91c7\u6837\u540e\u548c\u53c2\u8003\u7535\u6e90\uff08\u7531\u6676\u4f53\u7ba1<\/u>\u5e26\u9699\u53c2\u8003\u6e90\u6216\u8005\u9f50\u7eb3\u4e8c\u6781\u7ba1<\/u>\u63d0\u4f9b\uff09\u8fdb\u884c\u51cf\u6cd5\u8fd0\u7b97\uff0c\u5dee\u503c\u7ecf\u8fc7\u653e\u5927\u540e\u63a7\u5236\u63a8\u52a8\u7ba1\u4e0a\u7684\u7535\u538b\u964dV dropout =V output -V input \uff0c \u4f7f\u5f97\u5f53 V input \u53d8\u5316\u6216\u8005\u8d1f\u8f7d\u7535\u6d41\u53d8\u5316\u5bfc\u81f4 V output \u53d8\u5316\u65f6\uff0c\u901a\u8fc7 V dropout \u7684\u53d8\u5316\u4fdd\u8bc1 V output \u7684\u7a33\u5b9a\u3002<\/p>\n \n\t<\/p>\n \n\t\u7531\u56fe\u4e2d\u53ef\u89c1\uff0c\u8d1f\u8f7d\u7535\u6d41\u5168\u90e8\u6d41\u8fc7\u8c03\u6574\u7ba1\uff0c\u800c\u8f93\u5165\u7535\u538b\u548c\u8f93\u51fa\u7535\u538b\u4e4b\u95f4\u7684\u5dee\u5f02\u5168\u90e8\u90fd\u52a0\u5728\u8c03\u6574\u7ba1\u4e0a\u3002\u8c03\u6574\u7ba1\u4e0a\u8017\u6563\u7684\u529f\u7387\u4e3a V dropout *I\u3002\u5f53\u7535\u538b\u5dee\u8f83\u5927\u65f6\uff0c\u6216\u8005\u8d1f\u8f7d\u7535\u6d41\u8f83\u5927\u65f6\uff0c\u7a33\u538b\u5668\u5c06\u627f\u53d7\u8f83\u5927\u7684\u529f\u7387\u8017\u6563\u3002<\/p>\n \n\tLDO\u5fc5\u987b\u8ba1\u7b97\u70ed\u8017\u5e76\u6ee1\u8db3\u964d\u989d\u89c4\u8303\u53e6\u5916\uff0c\u8f93\u5165\u7684\u7535\u6e90\u63d0\u4f9b\u7684\u529f\u7387\u4e3a V input *I\uff0c\u5373\u91c7\u7528\u7ebf\u6027\u7535\u6e90\u65f6\u7535\u6e90\u529f\u7387\u7684\u8ba1\u7b97\u4e0d\u80fd\u4f7f\u7528\u8d1f\u8f7d\u7535\u538b\u548c\u7535\u6d41\u7684\u4e58\u79ef\u8ba1\u7b97\uff0c\u5fc5\u987b\u91c7\u7528\u7ebf\u6027\u7535\u6e90\u8f93\u5165\u7535\u538b\u548c\u8d1f\u8f7d\u7535\u6d41\u7684\u4e58\u79ef\u8ba1\u7b97\u91c7\u7528\u7ebf\u6027\u7535\u6e90\u65f6\u7535\u6e90\u529f\u7387\u7684\u8ba1\u7b97\u4e0d\u80fd\u4f7f\u7528\u8d1f\u8f7d\u7535\u538b\u548c\u7535\u6d41\u7684\u4e58\u79ef\u8ba1\u7b97\uff0c\u5fc5\u987b\u91c7\u7528\u7ebf\u6027\u7535\u6e90\u8f93\u5165\u7535\u538b\u548c\u8d1f\u8f7d\u7535\u6d41\u7684\u4e58\u79ef\u8ba1\u7b97\u3002\u5fc5\u987b\u7ecf\u8fc7\u8ba1\u7b97\u548c\u70ed\u4eff\u771f\u786e\u4fdd\u7cfb\u7edf\u7684\u6b63\u5e38\u5de5\u4f5c\u3002<\/span><\/p>\n \n\t\u4f8b\u5982\u91c7\u7528 1 \u53ea TO-263 \u5c01\u88c5\u7684 LDO \u5c06\u7535\u538b\u4ece 3.3V \u964d\u5230 1.2V\uff0c\u8d1f\u8f7d\u7535\u6d41\u4e3a 1.5A\uff0c\u8d1f\u8f7d\u4e0a\u8017\u6563\u7684\u529f\u7387\u4e3a 1.8W\u3002\u6b64\u65f6 LDO \u4e0a\u627f\u62c5\u4e86 2.1V \u538b\u964d\uff0c\u8017\u6563\u7684\u529f\u7387 3.15W\uff0c3.3V \u7535\u6e90\u63d0\u4f9b\u7684\u529f\u7387\u4e3a 4.95W\uff01\u5c01\u88c5\u7684\u70ed\u963b\u7ea6\u4e3a 40\u2103\/W\uff0c\u5219\u5982\u679c\u4e0d\u91c7\u53d6\u4efb\u4f55\u6563\u70ed\u63aa\u65bd\uff0c\u5219\u6e29\u5347\u80fd\u591f\u8fbe\u5230\u7ea6 120\u2103\u3002\u5bf9 LDO \u5fc5\u987b\u901a\u8fc7\u70ed\u4eff\u771f\u786e\u5b9a\u5408\u9002\u7684\u6563\u70ed\u63aa\u65bd\uff0c\u5e76\u4e14\u5728 3.3V \u7535\u6e90\u5728\u9884\u7b97\u4e2d\u5fc5\u987b\u80fd\u591f\u63d0\u4f9b 1.5A \u7684\u7535\u6d41\uff08\u6216\u8005 5W \u4ee5\u4e0a\u7684\u529f\u7387\uff09 \uff0c\u4fdd\u8bc1\u7cfb\u7edf\u7684\u5de5\u4f5c\u6b63\u5e38\u3002<\/span>\u91c7\u7528\u5f00\u5173<\/u>\u7535\u6e90\u80fd\u591f\u8fbe\u5230\u5f88\u9ad8\u7684\u6548\u7387\uff0c\u5bf9\u5927\u7535\u6d41\u53ca\u5927\u538b\u5dee\u7684\u573a\u5408\uff0c\u63a8\u8350\u91c7\u7528\u5f00\u5173\u7535\u6e90\u8fdb\u884c\u8f6c\u6362\u3002\u5982\u679c\u7535\u8def<\/u>\u5bf9\u7eb9\u6ce2\u8981\u6c42\u8f83\u9ad8\uff0c \u53ef\u4ee5\u91c7\u7528\u5f00\u5173\u7535\u6e90\u548c\u7ebf\u6027\u7535\u6e90\u4e32\u8054\u4f7f\u7528\u7684\u65b9\u6cd5\uff0c \u91c7\u7528\u7ebf\u6027\u7535\u6e90\u5bf9\u5f00\u5173\u7535\u6e90\u7684\u566a\u58f0\u8fdb\u884c\u6291\u5236\u3002<\/span><\/p>\n \n\t2\u3001LDO \u8f93\u51fa\u7aef\u6ee4\u6ce2\u7535\u5bb9\u9009\u53d6\u65f6\u6ce8\u610f\u53c2\u7167\u624b\u518c\u8981\u6c42\u7684\u6700\u5c0f\u7535\u5bb9\u3001\u7535\u5bb9\u7684 ESR\/ESL \u7b49\u8981\u6c42\u786e\u4fdd\u7535\u8def\u7a33\u5b9a\u3002\u63a8\u8350\u91c7\u7528\u591a\u4e2a\u7b49\u503c\u7535\u5bb9\u5e76\u8054\u7684\u65b9\u5f0f\uff0c\u589e\u52a0\u53ef\u9760\u6027\u4ee5\u53ca\u63d0\u9ad8\u6027\u80fdDO \u8f93\u51fa\u7535\u5bb9\u4e3a\u8d1f\u8f7d\u7684\u53d8\u5316\u63d0\u4f9b\u77ac\u6001\u7535\u6d41\uff0c\u540c\u65f6\u56e0\u4e3a\u8f93\u51fa\u7535\u5bb9\u5904\u4e8e\u7535\u538b\u53cd\u9988\u8c03\u8282\u56de\u8def\u4e4b\u4e2d\uff0c\u5728\u90e8\u5206 LDO \u4e2d\uff0c\u5bf9\u8be5\u7535\u5bb9\u5bb9\u91cf\u6709\u8981\u6c42\u4ee5\u786e\u4fdd\u8c03\u8282\u73af\u8def\u7a33\u5b9a\u3002\u8be5\u7535\u5bb9\u5bb9\u91cf\u4e0d\u6ee1\u8db3\u8981\u6c42\uff0cLDO \u53ef\u80fd\u53d1\u751f\u632f\u8361\u5bfc\u81f4\u8f93\u51fa\u7535\u538b\u5b58\u5728\u8f83\u5927\u7eb9\u6ce2\u3002<\/span>\u591a\u4e2a\u7535\u5bb9\u5e76\u8054\uff0c\u4ee5\u53ca\u5bf9\u5927\u5bb9\u91cf\u7535\u89e3\u7535\u5bb9\u5e76\u8054\u5c0f\u5bb9\u91cf\u7684\u9676\u74f7\u7535\u5bb9\uff0c\u6709\u5229\u4e8e\u51cf\u5c11 ESR \u548c ESL\uff0c\u63d0\u9ad8\u7535\u8def\u7684\u9ad8\u9891\u6027\u80fd\uff0c\u4f46\u662f\u5bf9\u4e8e\u67d0\u4e9b\u7ebf\u6027\u7a33\u538b\u7535\u6e90\uff0c\u8f93\u51fa\u7aef\u7535\u5bb9\u7684 ESR \u592a\u4f4e\uff0c\u4e5f\u53ef\u80fd\u4f1a\u8bf1\u53d1\u73af\u8def\u7a33\u5b9a\u88d5\u91cf\u4e0b\u964d\u751a\u81f3\u73af\u8def\u4e0d\u7a33\u5b9a\u3002<\/span><\/p>\n \n\t3\u3001\u6ee4\u6ce2\u7535\u5bb9<\/p>\n \n\t\uff081\uff09 \u7535\u6e90\u6ee4\u6ce2\u53ef\u91c7\u7528 RC \u3001LC \u3001π \u578b\u6ee4\u6ce2\u3002\u7535\u6e90\u6ee4\u6ce2\u5efa\u8bae\u4f18\u9009\u78c1\u73e0<\/u>\uff0c\u7136\u540e\u624d\u662f\u7535\u611f<\/u>\u3002\u540c\u65f6\u7535\u963b<\/u>\u3001\u7535\u611f\u548c\u78c1\u73e0\u5fc5\u987b\u8003\u8651\u5176\u7535\u963b\u4ea7\u751f\u7684\u538b\u964d\u5bf9\u7535\u6e90\u8981\u6c42\u8f83\u9ad8\u7684\u573a\u5408\u4ee5\u53ca\u9700\u8981\u5c06\u566a\u58f0\u9694\u79bb\u5728\u5c40\u90e8\u533a\u57df\u7684\u573a\u5408\uff0c \u53ef\u4ee5\u91c7\u7528\u65e0\u6e90\u6ee4\u6ce2\u7535\u8def\u3002\u5728\u91c7\u7528\u65e0\u6e90\u6ee4\u6ce2\u7535\u8def\u65f6\uff0c\u63a8\u8350\u91c7\u7528\u78c1\u73e0\u8fdb\u884c\u6ee4\u6ce2\u3002<\/span>\u78c1\u73e0\u548c\u7535\u611f\u7684\u4e3b\u8981\u533a\u522b\u662f\uff0c\u7535\u611f\u7684Q\u503c\u8f83\u9ad8\uff0c\u800c\u78c1\u73e0\u5728\u9ad8\u9891\u60c5\u51b5\u4e0b\u5448\u963b\u6027\uff0c\u4e0d\u6613\u53d1\u751f\u8c10\u632f\u7b49\u73b0\u8c61\u3002<\/span><\/p>\n \n\t\u7535\u611f\u52a0\u5de5\u7cbe\u5ea6\u8f83\u9ad8\uff0c\u800c\u78c1\u73e0\u52a0\u5de5\u7cbe\u5ea6\u76f8\u5bf9\u8f83\u4f4e\uff0c\u6210\u672c\u4e5f\u8f83\u4fbf\u5b9c\u3002\u5728\u9009\u62e9\u6ee4\u6ce2\u5668<\/u>\u4ef6\u65f6\uff0c\u4f18\u9009\u78c1\u73e0\u3002\u9009\u62e9\u7535\u963b\u548c\u7535\u5bb9\u6784\u6210\u65e0\u8c10\u632f\u7684\u4e00\u9636 RC \u4f4e\u901a\u6ee4\u6ce2\u5668\uff0c\u4f46\u662f\u8be5\u7535\u8def\u53ea\u80fd\u5e94\u7528\u4e8e\u7535\u6d41\u5f88\u5c0f\u7684\u60c5\u51b5\u3002\u8d1f\u8f7d\u7535\u6d41\u5c06\u5728\u7535\u963b\u4e0a\u5f62\u6210\u538b\u964d\uff0c\u5bfc\u81f4\u8d1f\u8f7d\u7535\u538b\u8dcc\u843d\u3002\u65e0\u8bba\u662f\u91c7\u7528\u4f55\u79cd\u6ee4\u6ce2\u5668\uff0c\u90fd\u9700\u8981\u8003\u8651\u8d1f\u8f7d\u7535\u6d41\u5728\u7535\u611f\u3001\u78c1\u73e0\u6216\u8005\u7535\u963b\u4e0a\u7684\u538b\u964d\uff0c\u786e\u8ba4\u6ee4\u6ce2\u540e\u7684\u7535\u538b\u80fd\u591f\u6ee1\u8db3\u540e\u7ea7\u7535\u8def\u5de5\u4f5c\u7684\u8981\u6c42\u3002<\/p>\n \n\t\u4f8b\u5982\u5728\u67d0\u5355\u677f\u9501\u76f8\u73af<\/u>\u8def\u8bbe\u8ba1\u4e2d\u91c7\u7528\u4e86\u4e00\u9636 RC \u6ee4\u6ce2\u5668\uff0c\u6ee4\u6ce2\u7535\u963b\u9009\u62e912 \u6b27\u59c6\u3002\u9501\u76f8\u73af\u4e2d VCXO \u7684\u5de5\u4f5c\u7535\u6d41\u7ea6\u4e3a 30mA\uff0c\u5728\u6ee4\u6ce2\u7535\u963b\u4e0a\u4ea7\u751f 300mV 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