{"id":2804,"date":"2019-09-12T00:38:08","date_gmt":"2019-09-12T00:38:08","guid":{"rendered":""},"modified":"2019-09-12T08:38:28","modified_gmt":"2019-09-12T00:38:28","slug":"%e6%99%ba%e8%83%bd%e6%89%8b%e6%9c%baled%e9%97%aa%e5%85%89%e7%81%af%e9%a9%b1%e5%8a%a8%e7%94%b5%e8%b7%af%e7%9a%84%e8%ae%be%e8%ae%a1","status":"publish","type":"post","link":"http:\/\/www.szryc.com\/?p=2804","title":{"rendered":"\u667a\u80fd\u624b\u673aLED\u95ea\u5149\u706f\u9a71\u52a8\u7535\u8def\u7684\u8bbe\u8ba1"},"content":{"rendered":"

\n\t\u6bcf\u5e74\u5e02\u573a\u4e0a\u90fd\u8981\u65b0\u589e\u51e0\u767e\u6b3e\u624b\u673a\uff0c\u8fd9\u4e9b\u624b\u673a\u7684\u57fa\u672c\u529f\u80fd\u90fd\u4e00\u6837\uff0c\u90a3\u5c31\u662f\u901a\u4fe1\u3002\u624b\u673a\u7684\u5468\u8fb9\u8bbe\u8ba1\u662f\u589e\u52a0\u624b\u673a\u9644\u52a0\u529f\u80fd\u3001\u589e\u52a0\u624b\u673a\u5356\u70b9\u4ee5\u53ca\u65b0\u5229\u6da6\u70b9\u7684\u4e3b\u8981\u9014\u5f84\u3002\u4e0d\u540c\u624b\u673a\u7684\u533a\u522b\u4e3b\u8981\u4f4f\u4e8e\u5916\u56f4\u529f\u80fd\uff0c\u8b6c\u5982\u5916\u89c2\u3001\u5c4f\u5e55\u989c\u8272\u4eae\u5ea6\u3001\u591a\u5a92\u4f53\u529f\u80fd\u3002<\/p>\n

\n\t\u73b0\u5728\u5e02\u573a\u7684LED<\/u>\u95ea\u5149\u706f\u9a71\u52a8\u63a7\u5236\u5668\u90fd\u96c6\u6210\u4e86\u63a7\u5236\u7535\u8def<\/u>\u548c\u5347\u538b\u5f00\u5173<\/u>\u7ba1\uff0c\u4f46\u662f\u7535\u611f<\/u>\u548c\u7528\u4e8e\u7eed\u6d41\u7684\u8096\u7279\u57fa\u4e8c\u6781\u7ba1<\/u>\u8fd8\u662f\u5916\u63a5\u7684\uff0c\u8fd9\u589e\u52a0\u4e86\u7535\u8def\u7684\u590d\u6742\u6027\u3001\u6210\u672c\u548cPCB<\/u>\u9762\u79ef\u3002\u6b64\u5916\uff0c\u7531\u4e8e\u95ea\u5149\u706f\u9a71\u529f\u7535\u8def\u3001LED\u3001\u663e\u793a\u5c4f\u3001\u624b\u673a\u5929\u7ebf\u4e00\u822c\u4f4d\u4e8e\u624b\u673a\u4e0a\u7aef\uff0c\u4e0e\u624b\u673a\u7684\u5c04\u9891<\/u>\u7535\u8def\u9760\u5f97\u5f88\u8fd1\uff0c\u6240\u4ee5\u6709\u6548\u9632\u6b62\u9a71\u52a8\u7535\u8def\u7535\u611f\u7684EMI<\/u>\u5e72\u6270\u4e5f\u662f\u5f88\u91cd\u8981\u7684\u95ee\u9898\u3002<\/p>\n

\n\t <\/div>\n

\n\t\u7535\u8377\u6cf5\u91c7\u7528\u7535\u5bb9<\/u>\u4f5c\u50a8\u80fd\u5143\u4ef6\uff0c\u7535\u8377\u6cf5\u4e0d\u9700\u8981\u5916\u63a5\u7535\u611f\uff0c\u56e0\u6b64\u4e0d\u5b58\u5728\u7535\u78c1\u5e72\u6270\u7684\u95ee\u9898\u3002\u6b64\u5916\uff0c\u6574\u4e2a\u89e3\u51b3\u65b9\u6848\u6240\u5360PCB\u7684\u9762\u79ef\u4e5f\u8f83\u5c0f\uff0c\u4f46\u76f8\u5bf9\u6765\u8bf4\u6548\u7387\u8f83\u4f4e\u3002\u7531\u4e8e\u95ea\u5149\u706f\u5de5\u4f5c\u65f6\u95f4\u975e\u5e38\u77ed\uff0c\u6301\u7eed\u65f6\u95f4\u4e00\u822c\u4e3a100~300ms\uff0c\u6240\u4ee5\u6548\u7387\u5bf9\u7535\u6c60<\/u>\u4f7f\u7528\u65f6\u95f4\u7684\u5f71\u54cd\u4e0d\u662f\u592a\u5927\u3002
\n\t <\/p>\n

\n\t\"\u667a\u80fd\u624b\u673aLED\u95ea\u5149\u706f\u9a71\u52a8\u7535\u8def\u7684\u8bbe\u8ba1\"<\/p>\n

\n\tLED\u95ea\u5149\u706f\u9a71\u52a8\u7535\u8def\u8bbe\u8ba1<\/p>\n

\n\tSipex\u516c\u53f8\u7684\u57fa\u4e8e\u7535\u8377\u6cf5\u5de5\u4f5c\u6a21\u5f0f\u7684\u95ea\u5149\u706f<\/p>\n

\n\tSipex\u95ea\u5149\u706f\u9a71\u52a8\u5668\u7cfb\u5217\u4ea7\u54c1\u7684\u5916\u56f4\u7535\u8def\u975e\u5e38\u7b80\u5355\uff0c\u4ec5\u4ec5\u9700\u8981\u4e09\u4e2a\u7535\u5bb9\u4e24\u4e2a\u7535\u963b<\/u>\uff0c\u5176\u4e2dRs<\/u>ense\u548cRSET\u6765\u8bbe\u7f6e\u95ea\u5149\u6a21\u5f0f\u548c\u5e38\u4eae\u6a21\u5f0f\u7684LED\u7535\u6d41<\/u>\u3002<\/p>\n

\n\t1.SP6685\u7684\u5e38\u4eae\u6a21\u5f0f\uff1a<\/p>\n

\n\tSP6685\u4e3a\u6052\u6d41\u578b\u9a71\u52a8\u82af\u7247\uff0c\u5728\u5e38\u4eae\u6a21\u5f0f\u4e0bFB\u7ba1\u811a\u7684\u7535\u538b50Mv\uff08\u5178\u578b\u503c\uff09\uff0c\u8fd9\u6837LED\u4e0a\u7684\u7535\u6d41\u4e3a\uff1a<\/p>\n

\n\tILED=50mV\/Rsense<\/p>\n

\n\t\u9700\u8981\u6307\u51fa\u7684\u662f\uff0c\u7531\u4e8eFB\u7684\u7535\u538b\u4e3a50mA\uff0c\u6240\u4ee5\u5373\u4f7f\u901a\u8fc7\u6ee1\u8f7d200mA\u7535\u6d41\uff0cRsense\u6d88\u8017\u7684\u529f\u7387\u4e3a\uff1a<\/p>\n

\n\tRsense=50mV200mA=0.01W<\/p>\n

\n\t\u7531\u6b64\u53ef\u89c1\uff0c\u4ec5\u75280603\u5c01\u88c5\u7684SMD\u7535\u963b\u5c31\u53ef\u4ee5\u6ee1\u8db3\u8981\u6c42\u3002\u4f46\u5728\u6052\u538b\u8f93\u51fa\u5de5\u4f5c\u6a21\u5f0f\u7684\u9a71\u52a8\u7535\u8def\u4e2d\uff0c\u9650\u6d41\u7535\u963b\u5fc5\u987b\u9009\u62e9\u8f83\u5927\u7684\u5c01\u88c5\u3002LED\u7684\u6b63\u5411\u7535\u538b\u4e00\u822c\u4e3a3V\u223d4V\uff0c\u5f53\u8f93\u51fa\u7535\u538b\u4e3a5V\u65f6\uff0c\u52a0\u5728\u9650\u6d41\u7535\u963b\u4e0a\u7684\u7535\u538b\u4e3a1V\u223d2V\uff0c\u5047\u8bbe\u95ea\u5149\u706f\u7535\u6d41200mA\uff0c\u5219\u9650\u6d41\u7535\u963b\u7684\u529f\u8017\u4e3a\uff1a<\/p>\n

\n\tPR=UI=\uff081V\u223d2V\uff090.2A=0.2W\u223d0.4W<\/p>\n

\n\t\u8fd9\u65f6\u5fc5\u987b\u91c7\u75284\u4e2a1206\u5c01\u88c5\u7684\u8d34\u7247\u7535\u963b<\/u>\u3002\u76f8\u6bd4\u91c7\u7528\u4e00\u4e2a0603\u7535\u963b\u7684SP6685\uff0c\u5176PCB\u9762\u79ef\u5927\u5927\u589e\u52a0\u3002<\/p>\n

\n\t\u4e0e\u6052\u538b\u8f93\u51fa\u7684\u7535\u8377\u6cf5\u76f8\u6bd4\uff0cSP6685\u5177\u6709\u6548\u7387\u65b9\u9762\u7684\u4f18\u52bf\u3002<\/p>\n

\n\t\u7535\u8377\u6cf5\u7684\u6548\u7387η\u53d6\u51b3\u4e8e\u8f93\u5165\u7535\u538bVinLED\u7684\u6b63\u5411\u7535\u538bVf\u548c\u5347\u538b\u500d\u6570K\uff081X\uff0c1.5X\uff0c2X\uff09\uff0c\u5176\u65b9\u7a0b\u5f0f\u4e3a\uff1a<\/p>\n

\n\tη=Vf\/\uff08Vink\uff09<\/p>\n

\n\t\u7531\u4e8e\u624b\u673a\u7535\u6c60\u7684\u5de5\u4f5c\u8303\u56f43.6V\u223d4.2V\uff0c\u5f53\u8f93\u51fa\u7535\u538b\u4e3a5V\u65f6\uff0c\u7535\u8377\u6cf5\u5fc5\u987b\u5de5\u4f5c\u5728\u5347\u538b\u6a21\u5f0f\u4e0b\uff0c\u5373K\u5fc5\u987b\u4e3a\u6216\u80052.\u800c\u5b9e\u9645\u4e0a\uff0c\u5f53\u8f93\u5165\u7535\u538b\u9ad8\u4e8eLED\u6b63\u5411\u7535\u538bVf\u4e00\u5b9a\u5e45\u503c\u65f6\uff0c\u7535\u8377\u6cf5\u53ef\u4ee5\u5de5\u4f5c\u57281X\u6a21\u5f0f\u4e0b\uff0c\u8fd9\u65f6\u7684\u529f\u7387\u5c06\u5927\u5927\u8d85\u8fc71.5X\u548c2X\u6a21\u5f0f\u4e0b\u7684\u6548\u7387\u3002<\/p>\n

\n\t2.SP6685\u7684\u95ea\u5149\u6a21\u5f0f\uff1a<\/p>\n

\n\tSP6685\u7684\u95ea\u5149\u6a21\u5f0f\u4e0b\u7684FB\u7535\u538b\u7531RSET\u51b3\u5b9a\uff0c\u8ba1\u7b97\u516c\u5f0f\u5982\u4e0b\uff1a<\/p>\n

\n\tVFB=\uff081.26VR<\/u>SET\uff0911.2kΩ<\/p>\n

\n\t\u5176\u4e2d\uff0c1.26V\u662f\u82af\u7247\u5185\u90e8\u53c2\u8003\u7535\u538b\uff0c\u4f7f\u5185\u90e8\u9650\u6d41\u7535\u963b\u3002\u8fd9\u6837\uff0cLED\u4e0a\u7684\u7535\u6d41\u4e3a\uff1a<\/p>\n

\n\tILED=VFB\/Rsense<\/p>\n

\n\t\u7531\u4e8eLED\u7684\u7535\u6d41\u4e0d\u901a\u8fc7RSET\uff0c\u6240\u4ee5\u51e0\u4e4e\u4e0d\u6d88\u8017\u529f\u7387\uff0c\u53ef\u4ee5\u9009\u62e90603\u6216\u80050402\u5c01\u88c5\u7684\u7535\u963b\u3002\u5728\u6574\u4e2a\u95ea\u5149\u706f\u9a71\u52a8\u7535\u8def\u65b9\u6848\u4e2d\uff0c\u4ec5\u9700\u8981\u4e24\u4e2a\u5c01\u88c5\u7684\u7535\u963b\u548c\u4e09\u4e2a0805\u5c01\u88c5\u7684\u7535\u963b\uff0c\u6240\u9700\u7684PCB\u9762\u79ef\u4e3a5.43mm\uff0c\u5177\u6709\u4e1a\u5185\u6700\u5c0f\u4f53\u79ef\u3002<\/p>\n

\n\t\u7efc\u5408\u6240\u8ff0\uff0cSipex\u516c\u53f8\u7684\u95ea\u5149\u706f\u9a71\u52a8\u7cfb\u5217\u4ea7\u54c1\u5177\u6709\u5f88\u591a\u4f18\u52bf\uff0c\u5305\u62ec\uff1a\u91c7\u7528\u7535\u6d41\u63a7\u5236\u6a21\u5f0f\uff0c\u53ef\u4ee5\u7cbe\u786e\u63a7\u5236LED\u4e0a\u7684\u7535\u6d41\u548c\u4eae\u5ea6\uff1b\u5916\u56f4\u5668\u4ef6\u6700\u5c11\uff0c\u6240\u9700\u5c01\u88c5\u6700\u5c0f\uff1b\u5f00\u5173\u9891\u7387\u6700\u9ad8\uff0c\u53ef\u4ee5\u9009\u62e9\u8f83\u5c0f\u5bb9\u503c\u7684\u6ee4\u6ce2\u7535\u5bb9\u548c\u7535\u8377\u6cf5\u7535\u5bb9\uff1b<\/p>\n

\n\t\u4e0d\u9700\u8981\u7535\u611f\uff0c\u4e0d\u4f1a\u4ea7\u751fEMI\u5e72\u6270\u95ee\u9898\uff1b\u53ef\u4ee5\u5de5\u4f5c\u57281X\u6a21\u5f0f\u4e0b\u5e76\u4e14\u53cd\u9988\u7535\u538b\u4f4e\u81f350mV\uff0c\u6240\u4ee5SP7685\/6685\/6686\u7684\u6548\u7387\u5728\u91c7\u7528\u7535\u8377\u6cf5\u6a21\u5f0f\u7684\u82af\u7247\u4e2d\u4e3a\u6700\u9ad8\uff1bSP7685\u5185\u7f6eTi<\/u>meout\u529f\u80fd\uff0c\u5728\u95ea\u5149\u6a21\u5f0f\u4e0b2.5\u79d2\u540e\u81ea\u52a8\u5173\u673a\uff0c\u4ece\u800c\u4fdd\u62a4LED\uff0c\u4ee5\u514dLED\u8fc7\u70ed\uff1b\u63d0\u4f9b\u4e1a\u5185\u6700\u5927\u9a71\u52a8\u7535\u6d41\uff08\u8fbe1.2A\uff09\uff0c\u5e76\u6709700mA\u3001400mA\u4e0d\u540c\u7b49\u7ea7\u7684\u9a71\u52a8\u82af\u7247\u4f9b\u9009\u62e9\u3002
\n\t\u6765\u6e90\uff1b\u7535\u5b50\u5de5\u7a0b\u7f51<\/p>\n","protected":false},"excerpt":{"rendered":"

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