{"id":2235,"date":"2024-06-15T12:07:58","date_gmt":"2024-06-15T04:07:58","guid":{"rendered":"https:\/\/www.huangrongzhen.ink\/?p=2235"},"modified":"2024-06-15T12:07:59","modified_gmt":"2024-06-15T04:07:59","slug":"%e7%a1%ac%e4%bb%b6%e8%ae%be%e8%ae%a1%e7%94%b5%e8%b7%af%e4%b8%ad%e5%b8%b8%e8%a7%81%e9%97%ae%e9%a2%98","status":"publish","type":"post","link":"https:\/\/www.huangrongzhen.ink\/?p=2235","title":{"rendered":"\u786c\u4ef6\u8bbe\u8ba1\u7535\u8def\u4e2d\u5e38\u89c1\u95ee\u9898"},"content":{"rendered":"

\u8bb0\u5f55\u4e00\u4e9b\u7535\u8def\u4e2d\u5e38\u89c1\u7684\u9519\u8bef\u3002 <\/p><\/div>\n\n\n

1\u3001\u529f\u7387\u7535\u611f\u4e0e\u8d34\u7247\u7535\u611f\u6df7\u7528\u3002DC-DC \u7535\u6e90\u7535\u8def\u4e2d\uff0c\u5e38\u5e38\u9700\u8981\u4f7f\u7528\u529f\u7387\u7535\u611f\u3002DC-DC \u7535\u6e90\u7535\u8def\u4e2d\uff0c\u4e00\u822c\u8f93\u51fa\u7535\u6d41\u5f88\u5927\uff0c\u4f7f\u7528\u5c0f\u529f\u7387\u7684\u8d34\u7247\u7535\u611f\uff0c\u5bb9\u6613\u9020\u6210\u8d34\u7247\u7535\u611f\u8fc7\u6d41\uff0c\u7136\u540e\u5347\u6e29\uff0c\u6700\u540e\u70e7\u574f\u7535\u611f\u3002\u4e00\u822c\uff0c\u6570\u636e\u624b\u518c\u4f1a\u7279\u522b\u8bf4\u660e\u8fd9\u9897\u7535\u611f\u4f7f\u7528\u529f\u7387\u7535\u611f\u3002\u8bbe\u8ba1\u7684\u65f6\u5019\u8bf7\u53c2\u7167\u6570\u636e\u624b\u518c\u3002<\/p>\n\n\n

\n
\"\"<\/figure><\/div>\n\n\n

\u57fa\u4e8e DC-DC \u7684\u9502\u7535\u6c60\u5145\u7535\u7535\u8def\u4e5f\u662f\u5982\u6b64\u3002\u9502\u7535\u6c60\u7684\u5145\u7535\u7535\u6d41\u5168\u90e8\u90fd\u8981\u6d41\u7ecf\u4e0b\u56fe\u6240\u793a\u7684 10uH \u7535\u611f\uff0c\u4e00\u822c\u5145\u7535\u7535\u6d41\u5728 1A \u5373\u4ee5\u4e0a\uff0c\u529f\u7387\u7535\u611f\u66f4\u9002\u7528\u4e8e\u6b64\u5904\u3002<\/p>\n\n\n

\n
\"\"<\/figure><\/div>\n\n\n

2\u3001\u8d1f\u538b\u8f6c\u6362\u7535\u8def\u4e2d\uff0c\u4f7f\u7528\u5230\u7535\u89e3\u7535\u5bb9\u3001\u94bd\u7535\u5bb9\u7b49\u5177\u6709\u6781\u6027\u7684\u7535\u5bb9\uff0c\u5bb9\u6613\u5f04\u9519\u65b9\u5411\uff0c\u5982\u4e0b\u56fe\u6240\u793a\u3002-5V \u7535\u538b\u6bd4 GND \u4f4e\uff0c\u56e0\u6b64\uff0c\u6709\u6781\u6027\u7684\u7535\u5bb9\u5668\uff0c\u6b63\u6781\u5e94\u63a5 GND\uff0c\u8d1f\u6781\u63a5 -5V\u3002<\/p>\n\n\n

\n
\"\"<\/figure><\/div>\n\n\n

3\u3001LDO \u7684\u82af\u7247\u70ed\u963b\u3002LDO \u4e0e DC-DC \u4e0d\u540c\uff0c\u672c\u8d28\u4e0a\u662f\u6839\u636e\u4e0d\u540c\u8d1f\u503a\u4fee\u6539\u81ea\u8eab\u7684\u5185\u963b\u503c\uff0c\u4ece\u800c\u8fbe\u5230\u7a33\u538b\u8f93\u51fa\u7684\u76ee\u7684\uff0c\u5982\u4e0b\u6240\u793a\uff0cRL \u5373\u4e3a\u8d1f\u503a\u7535\u8def\u3002\u53ef\u4ee5\u770b\u51fa\uff0c\u6709\u76f8\u5f53\u4e00\u90e8\u5206\u7684\u7535\u80fd\u5728 LDO \u82af\u7247\u4e0a\u4ee5\u70ed\u91cf\u7684\u5f62\u5f0f\u6d88\u8017\u4e86\u3002\u57fa\u4e8e\u8fd9\u79cd\u5de5\u4f5c\u6a21\u5f0f\uff0c\u4f7f\u5f97 LDO \u5728\u5927\u538b\u5dee\uff08\u8f93\u5165\u8f93\u51fa\u7535\u538b\u76f8\u5dee\u5f88\u5927\uff09\u3001\u5927\u7535\u6d41\u573a\u666f\u4e0b\u5bb9\u6613\u8fc7\u70ed\uff0c\u4ece\u800c\u89e6\u53d1\u8fc7\u70ed\u4fdd\u62a4\u3002<\/p>\n\n\n

\n
\"\"<\/figure><\/div>\n\n\n

LDO \u7684\u82af\u7247\u70ed\u963b\u7528 \u03b8JA \u8868\u793a\uff0c\u5355\u4f4d\u662f \u2103\/W\u3002\u4e0d\u540c\u5c01\u88c5\u7684\u6563\u70ed\u6548\u679c\u4e0d\u4e00\u6837\uff0c\u82af\u7247\u70ed\u963b\u81ea\u7136\u4e5f\u4e0d\u4e00\u6837\u3002\u4ee5 AMS \u751f\u4ea7\u7684 SOT-223 \u5c01\u88c5\u7684 AMS1117-3.3 \u4e3a\u4f8b\uff0c \u6839\u636e PCB \u5e03\u5c40\u5e03\u7ebf\u7684\u4e0d\u540c\uff0c\u03b8JA \u8303\u56f4\u5728 46\u2103\/W~90\u2103\/W\uff0c\u53d6\u6700\u574f\u7684\u60c5\u51b5\uff0c\u5373 \u03b8JA \u4e3a 90\u2103\/W\uff0c\u8868\u793a\u82af\u7247\u6bcf\u589e\u52a0 1W \u529f\u7387\uff0c\u4f1a\u5e26\u6765 90\u2103 \u6e29\u5347\u3002<\/p>\n\n\n\n

\u82af\u7247\u6e29\u5ea6=\u73af\u5883\u6e29\u5ea6\uff0b\u82af\u7247\u6e29\u5347\u3002<\/p>\n\n\n\n

AMS1117-3.3 \u5728 165\u2103 \u89e6\u53d1\u8fc7\u6e29\u4fdd\u62a4\uff0c\u5047\u5b9a\u8f93\u5165\u7535\u538b\u4e3a 12V\uff0c\u73af\u5883\u6e29\u5ea6\u4e3a 27\u2103\uff0c\u90a3\u4e48\u6700\u5927\u8f93\u51fa\u7535\u6d41\u4e3a [(165\u2103 – 27\u2103) \/ 90\u2103\/W] \/ (12V – 3.3V) = 0.176A\u3002\u867d\u7136 AMS1117-3.3 \u7684\u8f93\u51fa\u7535\u6d41\u4e3a 1A\uff0c\u4f46\u4e0d\u540c\u7684\u8f93\u5165\u7535\u538b\u3001\u4e0d\u540c\u7684 PCB \u5e03\u7ebf\u5e03\u5c40\u4e0b\uff0c\u5b9e\u9645\u8f93\u51fa\u7535\u6d41\u5f80\u5f80\u5c0f\u5f97\u591a\u3002<\/p>\n\n\n\n

4\u3001\u7535\u6d41\u6d4b\u91cf\u7535\u8def\u4e2d\uff0c\u91c7\u6837\u7535\u963b\u7684\u5c01\u88c5\u3002\u4e0b\u56fe\u4e2d\uff0cR1 \u7528\u4f5c\u603b\u7535\u6e90\u7535\u6d41\u68c0\u6d4b\uff0c\u540e\u7eed\u7535\u8def\u6240\u9700\u7535\u6d41\u5747\u6d41\u7ecf\u6b64\u7535\u963b\u3002\u91c7\u6837\u7535\u963b\u9009\u578b\u65f6\uff0c\u9700\u8981\u6ce8\u610f\u529f\u7387\u53c2\u6570\uff0c\u4f8b\u5982 2512 \u5c01\u88c5\u7684 20m\u03a9 \u7684\u7535\u963b\uff0c\u529f\u7387\u4e3a 3W\uff0c\u90a3\u4e48\u6d41\u7ecf\u7684\u6700\u5927\u7535\u6d41\u4e3a \u221a(3W\/0.02\u03a9) = 12.25A\u3002\u9884\u7559 30% \u7684\u4f59\u91cf\uff0c\u90a3\u4e48\u8fd9\u9897\u7535\u963b\u7684\u6700\u5927\u7535\u6d41\u4e3a 8.57A\u3002\u9664\u4e86\u5c01\u88c5\u4e4b\u5916\uff0c\u8fd8\u8981\u8003\u8651\u7535\u963b\u8001\u5316\u95ee\u9898\u3002<\/p>\n\n\n

\n
\"\"<\/figure><\/div>\n\n\n

5\u3001UART \u901a\u4fe1\u4e2d TXD \u4e0e RXD \u63a5\u53cd\u3002<\/p>\n\n\n\n

6\u3001\u9519\u8bef\u4f7f\u7528\u53bb\u8026\u7535\u5bb9\uff0c\u5982\u4e0b\u6240\u793a\u3002\u4e0b\u56fe\u4e2d\uff0c\u8fd0\u653e\u7684 4 \u53f7\u811a\u5e76\u672a\u8fde\u63a5\u5230\u7535\u6e90\u7f51\u7edc PR_5V\uff0c\u800c\u662f\u9694\u4e86\u4e00\u4e2a\u7535\u5bb9\uff0c\u5bfc\u81f4\u8fd0\u653e\u6ca1\u6709\u4f9b\u7535\u3002<\/p>\n\n\n

\n
\"\"<\/figure><\/div>\n\n\n

7\u3001\u8fd0\u7b97\u653e\u5927\u5668\u4f9b\u7535\u63a5\u53cd\u3002\u8fd0\u7b97\u653e\u5927\u5668\u4f9b\u7535\u53cd\u63a5\u540e\uff0c\u7528\u4e07\u7528\u8868\u6d4b\u4e0d\u51fa\u7535\u8def\uff0c\u4f46\u4e0a\u7535\u540e\u5448\u73b0\u51fa\u77ed\u8def\u73b0\u8c61\uff0c\u53cd\u63a5\u7684\u8fd0\u7b97\u653e\u5927\u5668\u4f1a\u5f02\u5e38\u53d1\u70eb\u3002\u4e00\u4e9b\u539f\u7406\u56fe\u5e93\u4e2d\uff0c\u5e76\u672a\u8868\u660e\u8fd0\u653e\u4f9b\u7535\u7aef\u7684\u6b63\u8d1f\u6781\uff0c\u5982\u4e0a\u56fe\u6240\u793a\uff0c\u6b64\u65f6\u8981\u4ed4\u7ec6\u67e5\u9605\u8fd0\u653e\u7684\u6570\u636e\u624b\u518c\u3002<\/p>\n\n\n\n

8\u3001\u8fd0\u7b97\u653e\u5927\u5668\u53cd\u9988\u7aef\u63a5\u53cd\u3002\u8fd0\u7b97\u653e\u5927\u5668\u7684\u865a\u77ed\u3001\u865a\u65ad\uff0c\u662f\u5efa\u7acb\u5728\u6df1\u5ea6\u8d1f\u53cd\u9988\u7684\u57fa\u7840\u4e0a\uff0c\u5982\u679c\u53cd\u9988\u7aef\u63a5\u5230\u4e86\u540c\u76f8\u8f93\u5165\u7aef\uff0c\u90a3\u4e48\u7535\u8def\u5c31\u53d8\u6210\u4e86\u6bd4\u8f83\u5668\uff0c\u8d77\u4e0d\u5230\u653e\u5927\u6548\u679c\u3002<\/p>\n\n\n\n

9\u3001\u4e0d\u63a8\u8350\u4f7f\u7528 JTAG\/SWG \u8c03\u8bd5\u5f15\u811a\u505a\u666e\u901a IO\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

\u8bb0\u5f55\u4e00\u4e9b\u7535\u8def\u4e2d\u5e38\u89c1\u7684\u9519\u8bef\u3002<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[],"_links":{"self":[{"href":"https:\/\/www.huangrongzhen.ink\/index.php?rest_route=\/wp\/v2\/posts\/2235"}],"collection":[{"href":"https:\/\/www.huangrongzhen.ink\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.huangrongzhen.ink\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.huangrongzhen.ink\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.huangrongzhen.ink\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2235"}],"version-history":[{"count":4,"href":"https:\/\/www.huangrongzhen.ink\/index.php?rest_route=\/wp\/v2\/posts\/2235\/revisions"}],"predecessor-version":[{"id":2245,"href":"https:\/\/www.huangrongzhen.ink\/index.php?rest_route=\/wp\/v2\/posts\/2235\/revisions\/2245"}],"wp:attachment":[{"href":"https:\/\/www.huangrongzhen.ink\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2235"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.huangrongzhen.ink\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2235"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.huangrongzhen.ink\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2235"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}