{"id":1532,"date":"2018-11-21T09:55:34","date_gmt":"2018-11-21T09:55:34","guid":{"rendered":""},"modified":"2018-11-21T17:55:58","modified_gmt":"2018-11-21T09:55:58","slug":"%e4%bb%80%e4%b9%88%e6%98%af+psrr%ef%bc%9f-%e7%ac%ac%e4%b8%89%e9%83%a8%e5%88%86","status":"publish","type":"post","link":"http:\/\/www.szryc.com\/?p=1532","title":{"rendered":"\u4ec0\u4e48\u662f PSRR\uff1f-\u7b2c\u4e09\u90e8\u5206"},"content":{"rendered":"

\u4e4b\u524d\u5728\u6211\u4eec\u7684\u535a\u5ba2\u300a\u4ec0\u4e48\u662f\u79ef\u5206\u566a\u58f0\uff1f\u7b2c\u4e8c\u90e8\u5206\u300b\u4e2d\uff0c\u6211\u4eec\u8c08\u5230\u4e86\u79ef\u5206\u566a\u58f0\u53ca\u5176\u610f\u4e49\u3002\u4eca\u5929\uff0c\u6211\u4eec\u5c06\u91cd\u70b9\u8c08\u8c08\u4f4e\u538b\u964d\u7a33\u538b\u5668(LDO)\u53c2\u6570\u548c\u7535\u6e90\u6291\u5236\u6bd4(PSRR) \u7279\u6027\uff0c\u4ee5\u53ca\u5b83\u5982\u4f55\u53d7\u5230\u5e94\u7528\u7684\u6761\u4ef6\u5f71\u54cd\u3002

\nPSRR\u63cf\u8ff0LDO\u6291\u5236\u8f93\u5165\u6e90\u7eb9\u6ce2\u7535\u538b\u7684\u80fd\u529b\uff0c\u53ef\u7528\u4ee5\u4e0b\u516c\u5f0f\u8868\u793a\uff1a<\/span><\/span>

\n
<\/p>\n

\n\t <\/span>

\n\t <\/div>\n

PSRR\u66f2\u7ebf\u7684\u4e00\u4e2a\u4f8b\u5b50\u5982\u56fe1\u6240\u793a\u3002\u6211\u4eec\u53ef\u628a\u6b64\u56fe\u5206\u6210\u4e24\u4e2a\u533a\u57df\u3002\u7b2c\u4e00\u4e2a\u533a\u57df\u6807\u8bb0\u4e3aLDO\u6709\u6e90\u533a\u57df\uff0c\u6db5\u76d6LDO\u4f5c\u4e3a\u6709\u6e90\u7eb9\u6ce2\u6291\u5236\u5668\u5de5\u4f5c\u7684\u9891\u7387\u8303\u56f4\u3002\u8fd9\u4ee3\u8868\u63a7\u5236\u56de\u8def\u80fd\u591f\u901a\u8fc7\u4e00\u4e2a\u8fc7\u6e21\u5668\u4ef6(pass device)\u8865\u507f\u8f93\u5165\u7eb9\u6ce2\uff0c\u5e76\u4fdd\u6301\u7a33\u5b9a\u7684\u8f93\u51fa\u7535\u538b\u3002\u5b9e\u9645\u4e0a\uff0c\u5b83\u7684\u5f62\u72b6\u51e0\u4e4e\u4e0e\u8fd0\u7b97\u653e\u5927\u5668\u7684\u589e\u76ca\u7279\u6027\u76f8\u540c\u3002\u5b83\u662f\u7ebf\u6027\u5347\u9ad8\u7684\uff0c\u76f4\u5230\u63a7\u5236\u56de\u8def\u4e0d\u80fd\u5c06\u589e\u76ca\u4fdd\u6301\u5728\u671f\u671b\u7684\u6c34\u5e73\u3002\u5728\u7406\u60f3\u4e16\u754c\u4e2d\uff0c\u5982\u679c\u6ca1\u6709\u4efb\u4f55\u8f93\u51fa\u7535\u5bb9\uff0c\u589e\u76ca\u5c31\u4f1a\u964d\u4f4e\uff0c\u76f4\u5230\u7b49\u4e8e1\u4e3a\u6b62\u3002\u8fd9\u4e00\u70b9\u88ab\u79f0\u4e3a\u8fc7\u6e21\u9891\u7387\u3002\u5728\u73b0\u5b9e\u4e16\u754c\u4e2d\uff0c\u4e00\u4e2aLDO\u9700\u8981\u4e00\u4e9b\u8f93\u51fa\u7535\u5bb9\u6765\u7a33\u5b9a\u3002\u5b83\u7684\u963b\u6297\u4e0e\u5bc4\u751f\u963b\u6297\u5171\u540c\u6784\u6210\u6ee4\u6ce2\u5668\uff0c\u6709\u52a9\u4e8e\u6539\u5584\u9ad8\u9891PSRR\u7279\u6027\u3002<\/span><\/span>

\n
<\/p>\n

\n\t <\/span><\/div>\n
\n\t\u56fe1.\u7b80\u5316\u7684PSRR\u9891\u7387\u533a\u57df\u56fe<\/span>

\n\t <\/div>\n

\u53e6\u4e00\u4e2a\u533a\u57df(COUT<\/span> +PCB\u5bc4\u751f\u533a)\uff0cLDO\u4e0d\u901a\u8fc7\u63a7\u5236\u56de\u8def\u6291\u5236\u8f93\u5165\u7535\u538b\u7eb9\u6ce2\uff0c\u53ea\u6709\u4e00\u4e2a\u8f93\u51fa\u7ea7\u963b\u6297\u3002

\nLDO\u7684PSRR\u6027\u80fd\u4e0d\u4ec5\u53d7\u5230\u7a33\u538b\u56de\u8def\u6027\u80fd\u7684\u5f71\u54cd\uff0c\u800c\u4e14\u8fd8\u53d7\u5230\u4e00\u4e9b\u5173\u952e\u5185\u90e8\u63a7\u5236\u7535\u8def\u6027\u80fd\u7684\u5f71\u54cd\u3002\u7535\u6e90\u4ea7\u751f\u7684\u7535\u538b\u7eb9\u6ce2\u901a\u8fc7\u5404\u79cd\u5185\u90e8\u5757\uff0c\u5f71\u54cd\u8f93\u51fa\u6027\u80fd\u3002\u56fe2\u663e\u793a\u4e86\u57fa\u672c\u7684LDO\u6846\u56fe\u548c\u8f93\u5165\u7535\u538b\u7eb9\u6ce2\u5f71\u54cd\u8f93\u51fa\u7535\u538b\u7684\u53ef\u80fd\u65b9\u5f0f\u3002<\/span><\/span>

\n
<\/p>\n

\n\t <\/span><\/div>\n
\n\t\u56fe2.\u7b80\u5316\u7684LDO\u6846\u56fe<\/span>

\n\t <\/div>\n

\u7b2c\u4e00\u6761\u91cd\u8981\u8def\u5f84\u662f\u5185\u90e8\u7535\u538b\u57fa\u51c6\u5757\u3002\u5b83\u4e3a\u8bef\u5dee\u653e\u5927\u5668\u548c\u5176\u4ed6LDO\u5757\u751f\u6210\u7a33\u5b9a\u548c\u5e72\u51c0\u7684\u53c2\u8003\u7535\u538b\u3002\u5f53\u4efb\u4f55\u7eb9\u6ce2\u7535\u538b\u901a\u8fc7\u57fa\u51c6\u5757\u5230\u8f93\u51fa\u65f6\uff0c\u8bef\u5dee\u653e\u5927\u5668\u5c06\u8fd9\u4e0d\u60f3\u8981\u7684\u7535\u538b\u7eb9\u6ce2\u590d\u5236\u5230LDO\u8f93\u51fa\u3002\u8fd9\u662f\u4e0d\u60f3\u8981\u7684\u884c\u4e3a\uff0c\u56e0\u6b64\u57fa\u51c6\u7535\u538b\u5757\u5e94\u5c3d\u53ef\u80fd\u5e72\u51c0\uff0c\u4ee5\u83b7\u5f97\u597d\u7684PSRR\u3002

\n

\n\u7b2c\u4e8c\u6761\u654f\u611f\u8def\u5f84\u662f\u8bef\u5dee\u653e\u5927\u5668\u7535\u6e90\u3002\u65e0\u8bba\u53c2\u8003\u7535\u538b\u7684\u7a33\u5b9a\u6027\u5982\u4f55\uff0c\u5982\u679c\u8bef\u5dee\u653e\u5927\u5668\u6ca1\u6709\u5e72\u51c0\u7684\u7535\u6e90\u7535\u538b\uff0c\u7ed3\u679c\u5c06\u662f\u4e0d\u51c6\u786e\u7684\u3002\u8026\u5408\u7535\u538b\u7eb9\u6ce2\u4f1a\u5f71\u54cd\u653e\u5927\u5668\u7684\u589e\u76ca\u7a33\u5b9a\u6027\u548c\u9891\u7387\u8865\u507f\uff0c\u5bfc\u81f4\u8f93\u51fa\u7535\u538b\u6270\u52a8\uff0c\u964d\u4f4ePSRR\u3002

\n

\n\u7b2c\u4e09\u6761\u8def\u5f84\u662f\u901a\u8fc7\u8fc7\u6e21\u5668\u4ef6(pass device)\u8026\u5408\u5230\u8f93\u51fa\u7aef\u3002\u901a\u8fc7\u5bf9\u7a33\u538b\u5668\u8fdb\u884c\u9002\u5f53\u7684\u8865\u507f\uff0c\u51cf\u5c0f\u7eb9\u6ce2\u3002\u8fd9\u662f\u8f93\u51fa\u7535\u538b\u7eb9\u6ce2\u7684\u4e3b\u8981\u539f\u56e0\uff0c\u8bbe\u8ba1\u826f\u597d\u7684LDO\u5e94\u8be5\u80fd\u591f\u5728\u4f4e\u9891\u548c\u4e2d\u9891\u533a\u57df\u6291\u5236\u8fd9\u7eb9\u6ce2\u3002

\nLDO\u7684PSRR\u6027\u80fd\u4e5f\u53d7\u5916\u90e8\u5e94\u7528\u6761\u4ef6\u7684\u5f71\u54cd\u3002\u6700\u91cd\u8981\u7684\u56e0\u7d20\u662f\u8d1f\u8f7d\u7535\u6d41\u3001\u8f93\u51fa\u7535\u5bb9\u548c\u7535\u538b\u4f59\u91cf\u3002\u8ba9\u6211\u4eec\u66f4\u8fdb\u4e00\u6b65\u770b\u770b\u8fd9\u6bcf\u4e00\u6761\u8def\u5f84\u3002

\n

\n\u56fe3\u663e\u793a\u4e86\u7a33\u538b\u5668\u8d1f\u8f7d\u7535\u6d41\u7684\u5f71\u54cd\u3002\u6211\u4eec\u53ef\u770b\u5230\uff0c\u5728\u9ad8\u9891\u8303\u56f4\u5185\uff0c\u66f4\u9ad8\u7684\u7535\u6d41\u4f1a\u4f7fPSRR\u66f4\u5dee.<\/span><\/span>

\n
<\/p>\n

\n\t <\/span><\/div>\n
\n\t\u56fe3.\u8f93\u51fa\u66f2\u7ebf\u5bf9\u6bd4PSRR-NCP163<\/span>

\n\t <\/div>\n

\u56fe4\u663e\u793a\u4e86\u8f93\u51fa\u7535\u5bb9\u7684\u9009\u62e9\u5982\u4f55\u5f71\u54cdPSRR\u3002\u6211\u4eec\u53ef\u770b\u5230\uff0c\u5728\u9ad8\u9891\u533a\u57df\uff0c\u66f4\u9ad8\u7684\u7535\u5bb9\u5927\u5927\u63d0\u9ad8\u4e86PSRR\u3002\u8fd9\u8bc1\u5b9e\u4e86\u6211\u4eec\u4ee5\u524d\u7684\u7406\u8bba\uff0c\u8f93\u51fa\u963b\u6297\u548cPCB\u5bc4\u751f\u963b\u6297\u5f62\u6210\u4e00\u4e2aLC\u6ee4\u6ce2\u5668\uff0c\u4ee5\u4fdd\u6301\u8f83\u9ad8\u7684PSRR\u3002\u5f53LDO\u7528\u4f5c\u540eDC-DC\u7a33\u538b\u5668\u65f6\uff0c\u5b83\u5bf9\u8c03\u8282PSRR\u5f88\u6709\u7528\u3002\u7ecf\u9a8c\u4e30\u5bcc\u7684\u5de5\u7a0b\u5e08\u53ef\u4ee5\u79fb\u52a8PSRR\u5cf0\u503c\uff0c\u4ee5\u51c6\u786e\u5339\u914d\u53d8\u6362\u5668\u7684\u5f00\u5173\u9891\u7387\u3002\u5e94\u4fdd\u6301\u5141\u8bb8\u7684\u6700\u5927COUT<\/span> \u503c\u3002<\/span><\/span>

\n
<\/p>\n

\n\t <\/span><\/div>\n
\n\t\u56fe4.\u8f93\u51fa\u7535\u5bb9\u503c\u5bf9\u6bd4PSRR – NCP163<\/span>

\n\t <\/div>\n

\u5728\u56fe5\u4e2d\uff0c\u6211\u4eec\u53ef\u770b\u5230\u7ecf\u5e38\u88ab\u5ffd\u7565\u7684\u7535\u538b\u4f59\u91cf\u53c2\u6570\u53ca\u5176\u5bf9PSRR\u7684\u5f71\u54cd\u3002\u7535\u538b\u4f59\u91cf\u662f\u6307VIN<\/span>-VOUT<\/span> \u4e4b\u95f4\u7684\u7535\u538b\u5dee\uff0c\u4e0d\u80fd\u4e0eLDO\u538b\u964d\u6df7\u6dc6\u3002\u5728\u4e0b\u9762\u7684\u4f8b\u5b50\u4e2d\uff0cNCP 163\u63d0\u4f9b\u4e86\u975e\u5e38\u4f4e\u7684\u538b\u964d\uff0c\u56e0\u6b64\u53ef\u4ee5\u4f7f\u7528\u975e\u5e38\u5c0f\u7684\u7535\u538b\u4f59\u91cf\u6765\u5b9e\u73b0\u76f8\u5f53\u597d\u7684PSRR\u6027\u80fd\u3002\u6211\u4eec\u53ef\u770b\u5230\uff0c100\u6beb\u4f0f\u7684\u7535\u538b\u4f59\u91cf\u8db3\u4ee5\u5b9e\u73b0\u53ef\u9760\u7684\u529f\u80fd\uff0c\u4f46\u6bcf\u589e\u52a01\u6beb\u4f0f\u5c31\u663e\u7740\u6539\u5584PSRR\u3002\u6700\u7ec8\u56de\u62a5\u4f1a\u9012\u51cf\uff0c\u6ca1\u6709\u5fc5\u8981\u4f7f\u7528\u9ad8\u4e8e300 mV\u7684\u7535\u538b\u4f59\u91cf\u3002<\/span><\/span>

\n
<\/p>\n

\n\t <\/span><\/div>\n
\n\t\u56fe5.\u7535\u538b\u4f59\u91cf\u5bf9\u6bd4PSRR – NCP163<\/span>

\n\t <\/div>\n

\u4e86\u89e3PSRR\u4ee5\u53ca\u8f93\u5165\u7535\u538b\u7eb9\u6ce2\u5982\u4f55\u8026\u5408\u5230LDO\u7ed3\u6784\u4e2d\u5e76\u5f71\u54cd\u5176\u6027\u80fd\u5bf9\u4e8eLDO\u6027\u80fd\u975e\u5e38\u91cd\u8981\u3002\u6211\u4eec\u7684\u4e0b\u4e00\u7bc7\u535a\u5ba2\u5c06\u8c08\u8c08PSRR\u503c\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\u7684\u610f\u4e49\u3002\u8bf7\u7ee7\u7eed\u5173\u6ce8\u3002\u8bf7\u7ee7\u7eed\u5173\u6ce8\u4e00\u4e9b\u597d\u7684\u8bbe\u8ba1\u5b9e\u8df5\u7684\u826f\u597d\u8303\u56f4\u7684\u56fe\u7247\u548c\u6f14\u793a\u3002\u6240\u6709\u7684\u6d4b\u91cf\u548c\u56fe\u8868\u90fd\u91c7\u7528\u6211\u4eec\u7684\u8d85\u9ad8PSRR NCP163\u3002

\n <\/span><\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

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