{"id":30396,"date":"2026-08-10T09:01:57","date_gmt":"2026-08-10T01:01:57","guid":{"rendered":"https:\/\/techclass.wfjydl.com\/?p=30396"},"modified":"2026-08-07T16:59:20","modified_gmt":"2026-08-07T08:59:20","slug":"mosfet%e7%9a%84%e5%af%bc%e9%80%9a%e7%94%b5%e9%98%bb%ef%bc%88rdson%ef%bc%89","status":"publish","type":"post","link":"https:\/\/techclass.wfjydl.com\/knowledge\/transistors\/transistors-basic\/23724","title":{"rendered":"MOSFET\u7684\u5bfc\u901a\u7535\u963b\uff08RDS(on)\uff09"},"content":{"rendered":"<p>MOSFET\u7684\u5bfc\u901a\u7535\u963b\uff08\\(R_{DS(on)}\\)\uff09\u662f\u6307MOSFET\u5904\u4e8e\u5bfc\u901a\u72b6\u6001\u65f6\u6f0f\u6781\u4e0e\u6e90\u6781\u4e4b\u95f4\u7684\u7535\u963b\uff0c\u662f\u5f71\u54cd\u5bfc\u901a\u635f\u8017\u548c\u53d1\u70ed\u7684\u91cd\u8981\u53c2\u6570\u3002\u5bfc\u901a\u7535\u963b\uff08\\(R_{DS(on)}\\)\uff09\u4f1a\u968f\u7740\u6805\u6781-\u6e90\u6781\u7535\u538b\uff08\\(V_{GS}\\)\uff09\u3001\u6f0f\u6781\u7535\u6d41\uff08\\(I_D\\)\uff09\u3001\u7ed3\u6e29\uff08\\(T_J\\)\uff09\u7b49\u6761\u4ef6\u800c\u53d8\u5316\uff0c\u901a\u5e38\u968f\u6e29\u5ea6\u5347\u9ad8\u6216\\(V_{GS}\\)\u964d\u4f4e\u800c\u589e\u52a0\u3002\u7279\u522b\u662f\u5728\u7535\u6e90\u7535\u8def\u548c\u7535\u673a\u63a7\u5236\u7535\u8def\u7b49\u5927\u7535\u6d41\u5e94\u7528\u4e2d\uff0c\\(R_{DS(on)}\\)\u7684\u5dee\u5f02\u4e0e\u635f\u8017\u3001\u6e29\u5347\u606f\u606f\u76f8\u5173\uff0c\u56e0\u6b64\u638c\u63e1\u6280\u672f\u89c4\u683c\u4e66\u7684\u89e3\u8bfb\u65b9\u6cd5\u548c\u4f30\u7b97\u6b65\u9aa4\u81f3\u5173\u91cd\u8981\u3002\u672c\u6587\u5c06\u4ecb\u7ecd\\(R_{DS(on)}\\)\u7684\u89e3\u8bfb\u65b9\u6cd5\u3001\u5bfc\u901a\u635f\u8017\u7684\u8ba1\u7b97\u65b9\u6cd5\u4ee5\u53ca\u6839\u636e\u7528\u9014\u9009\u62e9\u5668\u4ef6\u7684\u8981\u70b9\u3002<\/p>\n<h2 id=\"toc1\">MOSFET\u7684\u5bfc\u901a\u7535\u963b\u4e0e\u5bfc\u901a\u635f\u8017\u7684\u5173\u7cfb<\/h2>\n<p>MOSFET\u7684\u5bfc\u901a\u7535\u963b\uff08\\(R_{DS(on)}\\)\uff09\u662f\u4f30\u7b97\u5bfc\u901a\u65f6\u635f\u8017\u7684\u57fa\u51c6\u3002\u76f8\u6bd4\u4e4b\u4e0b\uff0c\u53cc\u6781\u7ed3\u578b\u6676\u4f53\u7ba1\uff08BJT\uff09\u4f5c\u4e3a\u9971\u548c\u5f00\u5173\u4f7f\u7528\u65f6\uff0c\u5176\u5bfc\u901a\u65f6\u7684\u635f\u8017\u4e3b\u8981\u7531\u96c6\u7535\u6781-\u53d1\u5c04\u6781\u95f4\u7684\u9971\u548c\u7535\u538b\uff08\\(V_{CE(sat)}\\)\uff09\u51b3\u5b9a\u3002\u800cMOSFET\u5728\u5bfc\u901a\u72b6\u6001\u4e0b\u4f1a\u50cf\u7535\u963b\u4e00\u6837\u5de5\u4f5c\uff0c\u56e0\u6b64\u5176\u635f\u8017\u4f1a\u4e0e\u7535\u6d41\u7684\u5e73\u65b9\u6210\u6b63\u6bd4\u589e\u52a0\u3002\u4e0b\u9762\u5217\u51fa\u4e86\u635f\u8017\u8868\u793a\u65b9\u5f0f\u7684\u5dee\u5f02\u3002<\/p>\n<h3 id=\"toc2\">MOSFET\u4e0eBJT\u7684\u635f\u8017\u8868\u793a\u65b9\u5f0f\u5dee\u5f02<\/h3>\n<p>\u53cc\u6781\u7ed3\u578b\u6676\u4f53\u7ba1\uff08BJT\uff09\u5728\u4f5c\u4e3a\u5f00\u5173\u4f7f\u7528\u5e76\u5904\u4e8e\u9971\u548c\u72b6\u6001\u65f6\uff0c\u5176\u5bfc\u901a\u65f6\u7684\u5bfc\u901a\u635f\u8017\u53ef\u901a\u8fc7\u4ee5\u4e0b\u516c\u5f0f\u8ba1\u7b97\u5f97\u51fa\u3002<\/p>\n<p><!-- \u6570\u5f0f --><\/p>\n<p>\u96c6\u7535\u6781\u635f\u8017\uff1a\u3000<span class=\"mathjax-text\">\\(P_C=V_{CE(sat)} \u00d7I_C\\)<\/span><\/p>\n<p>\u5bf9\u4e8eMOSFET\u800c\u8a00\uff0c\u5728\u5bfc\u901a\u72b6\u6001\u4e0b\uff0c\u5176\u6f0f\u6781-\u6e90\u6781\u95f4\u4f5c\u4e3a\u7535\u963b\uff08\\(R_{DS(on)}\\)\uff09\u5de5\u4f5c\uff0c\u56e0\u6b64\u5bfc\u901a\u65f6\u7684\u5bfc\u901a\u635f\u8017\u53ef\u901a\u8fc7\u4ee5\u4e0b\u516c\u5f0f\u8fd1\u4f3c\u8ba1\u7b97\u3002<\/p>\n<p><!-- \u6570\u5f0f --><\/p>\n<p>\u5bfc\u901a\u635f\u8017\uff1a\u3000<span class=\"mathjax-text\">\\(P_D\u2248I_D^2\u00d7R_{DS(on)}\\)<\/span><\/p>\n<p>\u8fd9\u79cd\u635f\u8017\u4ee5\u70ed\u7684\u5f62\u5f0f\u5728MOSFET\u5185\u90e8\u4ea7\u751f\uff0c\u5e76\u901a\u8fc7\u5c01\u88c5\u548c\u7535\u8def\u677f\u6563\u53d1\u51fa\u6765\u3002\u56e0\u6b64\uff0c\\(R_{DS(on)}\\)\u8d8a\u5c0f\uff0c\u5bfc\u901a\u635f\u8017\u5c31\u8d8a\u4f4e\uff0c\u4ece\u800c\u66f4\u5bb9\u6613\u6291\u5236\u53d1\u70ed\u91cf\u3002\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u5b9e\u9645\u7684\u6e29\u5347\uff0c\u8fd8\u4f1a\u53d7\u5230\u5143\u5668\u4ef6\u6e29\u5ea6\u3001\u7535\u8def\u677f\u8bbe\u8ba1\u3001\u6563\u70ed\u6761\u4ef6\u3001\u5f00\u5173\u9891\u7387\u7b49\u56e0\u7d20\u7684\u5f71\u54cd\u3002<\/p>\n<p><!-- \u753b\u50cf --><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/techclass.wfjydl.com\/wp-content\/uploads\/2026\/08\/01-difference-in-on-state-loss-between-mosfets-and-bjts.png\" alt=\"MOSFET\u4e0eBJT\u7684\u5bfc\u901a\u635f\u8017\u5dee\u5f02\" width=\"700\" height=\"394\" \/><\/p>\n<p>&nbsp;<\/p>\n<h2 id=\"toc3\">\u5bfc\u901a\u7535\u963b\uff08\\(R_{DS(on)}\\)\uff09\u7684\u7535\u6c14\u7279\u6027<\/h2>\n<h3 id=\"toc4\">\u7ed3\u5408\u6d4b\u91cf\u6761\u4ef6\uff08\\(V_{GS}\\) \/ \\(I_D\\) \/ \\(T_J\\)\uff09\u8fdb\u884c\u89e3\u8bfb<\/h3>\n<p>\u5bfc\u901a\u7535\u963b\\(R_{DS(on)}\\)\u5e76\u975e\u56fa\u5b9a\u503c\uff0c\u5176\u503c\u4f1a\u968f\u6805-\u6e90\u7535\u538b\uff08\\(V_{GS}\\)\uff09\u3001\u6f0f\u6781\u7535\u6d41\uff08\\(I_D\\)\uff09\u3001\u7ed3\u6e29\uff08\\(T_J\\)\uff09\u7b49\u6761\u4ef6\u7684\u53d8\u5316\u800c\u6539\u53d8\u3002\u6280\u672f\u89c4\u683c\u4e66\u4e2d\u8bb0\u8f7d\u7684\\(R_{DS(on)}\\)\u5fc5\u7136\u4e0e\u5176\u6d4b\u91cf\u6761\u4ef6\u76f8\u5e94\u51fa\u73b0\uff0c\u56e0\u6b64\u5728\u8bbe\u8ba1\u65f6\u9700\u8981\u5728\u8fd9\u4e9b\u76f8\u540c\u6761\u4ef6\u8fdb\u884c\u6bd4\u8f83\uff0c\u5e76\u7ed3\u5408\u5b9e\u9645\u8fd0\u884c\u73af\u5883\u9884\u7559\u5145\u8db3\u7684\u88d5\u91cf\u3002<\/p>\n<h3 id=\"toc5\">\\(V_{GS}\\)\u548c\\(I_D\\)\u5f15\u8d77\u7684\u5bfc\u901a\u7535\u963b\u53d8\u5316\uff1a\u7528\u4e8e\u635f\u8017\u8ba1\u7b97\u7684\\(R_{DS(on)}\\)\u7684\u9009\u62e9\u65b9\u6cd5<\/h3>\n<p><!-- \u753b\u50cf --><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/techclass.wfjydl.com\/wp-content\/uploads\/2026\/08\/02-conceptual-diagram-showing-vgs-dependence-of-rds-on.png\" alt=\"RDS(on)\u7684VGS\u4f9d\u8d56\u6027\u6982\u5ff5\u56fe\" width=\"700\" height=\"394\" \/><\/p>\n<p>\u5982\u4e0a\u8ff0\u7279\u6027\u66f2\u7ebf\u6240\u793a\uff0c\u5bfc\u901a\u7535\u963b\u968f\u6805-\u6e90\u7535\u538b\u7684\u5347\u9ad8\u800c\u51cf\u5c0f\u3002\u53e6\u5916\uff0c\u5373\u4f7f\u5728\u76f8\u540c\u7684\u6805-\u6e90\u7535\u538b\u6761\u4ef6\u4e0b\uff0c\u5bfc\u901a\u7535\u963b\u4e5f\u4f1a\u968f\u6f0f\u6781\u7535\u6d41\u7684\u53d8\u5316\u800c\u53d8\u5316\u3002\u5728\u8ba1\u7b97\u635f\u8017\u65f6\uff0c\u5e94\u4f7f\u7528\u4e0e\u5b9e\u9645\u65bd\u52a0\u7684\u6805-\u6e90\u7535\u538b\uff08\\(V_{GS}\\)\uff09\u548c\u9884\u671f\u6f0f\u6781\u7535\u6d41\uff08\\(I_D\\)\uff09\u76f8\u8fd1\u6761\u4ef6\u4e0b\u7684\u5bfc\u901a\u7535\u963b\\(R_{DS(on)}\\)\u3002\u5f53\u6280\u672f\u89c4\u683c\u4e66\u4e2d\u7ed9\u51fa\u591a\u4e2a\\(V_{GS}\\)\u6761\u4ef6\u65f6\uff0c\u5e94\u4ee5\u6700\u63a5\u8fd1\u5b9e\u9645\u6805\u6781\u9a71\u52a8\u7535\u538b\uff08\u4f8b\u5982\uff1a4.5V\/5V\/10V\uff09\u6761\u4ef6\u7684\u503c\u6216\u7279\u6027\u66f2\u7ebf\u4e3a\u57fa\u51c6\u3002<\/p>\n<h3 id=\"toc6\">\u7535\u963b\u533a\uff08\u6b27\u59c6\u533a\uff09\u7684\u8fd1\u4f3c\u516c\u5f0f\u53ca\u5176\u4e0e\u5bfc\u901a\u635f\u8017\u7684\u5173\u8054<\/h3>\n<p>\u5f53MOSFET\u5904\u4e8e\u5bfc\u901a\u72b6\u6001\u5e76\u4f5c\u4e3a\u7535\u963b\u5de5\u4f5c\u65f6\uff0c\u5728\u6f0f-\u6e90\u7535\u538b\uff08\\(V_{DS}\\)\uff09\u76f8\u5bf9\u8f83\u5c0f\u7684\u533a\u57df\uff08\u7535\u963b\u533a\uff0c\u4e5f\u79f0\u6b27\u59c6\u533a\uff09\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8fd1\u4f3c\u516c\u5f0f\u3002<\/p>\n<p><!-- \u6570\u5f0f --><\/p>\n<p><span class=\"mathjax-text\">\\(R_{DS(on)} \u2248 \\displaystyle\\frac{V_{DS}}{I_D} \\)<\/span><\/p>\n<p><!-- \u753b\u50cf --><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/techclass.wfjydl.com\/wp-content\/uploads\/2026\/08\/03-mosfet-ohmic-region.png\" alt=\"MOSFET\u7684\u7535\u963b\u533a\" width=\"700\" height=\"394\" \/><\/p>\n<p>\u4e0b\u9762\u5c06\u4f7f\u7528\u8be5\\(R_{DS(on)}\\)\u4f30\u7b97\u5bfc\u901a\u635f\u8017\uff08\u7535\u6d41\u53d8\u5316\u65f6\uff0c\u4f7f\u7528\u6709\u6548\u503cIRMS\uff09\u3002<\/p>\n<p>&nbsp;<\/p>\n<h3 id=\"toc7\">\\(R_{DS(on)}\\) \u968f\u6e29\u5ea6\u5347\u9ad8\u800c\u589e\u5927<\/h3>\n<p>\\(R_{DS(on)}\\)\u4e5f\u4f1a\u968f\u6e29\u5ea6\u800c\u53d8\u5316\u3002\u901a\u5e38\u6e29\u5ea6\u5347\u9ad8\u65f6\\(R_{DS(on)}\\)\u4f1a\u589e\u5927\uff08\u5448\u73b0\u6b63\u6e29\u5ea6\u7cfb\u6570\uff09\uff0c\u56e0\u6b64\u5728\u8ba1\u7b97\u635f\u8017\u65f6\u9700\u8981\u8003\u8651\u5230\u5de5\u4f5c\u65f6\u7684\u6e29\u5347\u3002<\/p>\n<p><!-- \u753b\u50cf --><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/techclass.wfjydl.com\/wp-content\/uploads\/2026\/08\/04-conceptual-diagram-showing-temperature-dependence-of-rds-on.png\" alt=\"RDS(on)\u6e29\u5ea6\u4f9d\u8d56\u6027\u7684\u6982\u5ff5\u56fe\" width=\"700\" height=\"394\" \/><\/p>\n<p>&nbsp;<\/p>\n<h3 id=\"toc8\">\u6280\u672f\u89c4\u683c\u4e66\u4e2d\u7684\u503c\uff08typ\/max\uff09\u53ca\u8bbe\u8ba1\u88d5\u91cf\u7684\u53d6\u6cd5<\/h3>\n<p>\u5728\u7535\u6c14\u7279\u6027\u8868\u4e2d\uff0c\u901a\u5e38\u4f1a\u540c\u65f6\u7ed9\u51fa\\(R_{DS(on)}\\)\u7684typ\uff08\u5178\u578b\u503c\uff09\u548cmax\uff08\u6700\u5927\u503c\uff09\u3002\u5728\u8fdb\u884c\u635f\u8017\u548c\u6e29\u5347\u8bbe\u8ba1\u65f6\uff0c\u539f\u5219\u4e0a\u4ee5\u6700\u5927\u503c\uff08max\uff09\u4e3a\u57fa\u51c6\uff0c\u5e76\u5728\u6b64\u57fa\u7840\u4e0a\uff0c\u7ed3\u5408\u6e29\u5ea6\u7279\u6027\uff08\\(R_{DS(on)}\\)\u7684\u6e29\u5ea6\u4f9d\u8d56\u6027\uff09\u8003\u8651\u5230\u9884\u671f\u7ed3\u6e29\uff08\\(T_J\\)\uff09\u4e0b\u7684\u589e\u52a0\u91cf\uff0c\u4ee5\u786e\u4fdd\u8bbe\u8ba1\u66f4\u5b89\u5168\u3002\u5178\u578b\u503c\uff08typ\uff09\u53ef\u4ee5\u4f5c\u4e3a\u8861\u91cf\u201c\u8be5\u4ea7\u54c1\u6613\u4e8e\u5b9e\u73b0\u591a\u4f4e\u7684\u7535\u963b\u201d\u7684\u53c2\u8003\u6307\u6807\uff0c\u4f46\u5728\u9700\u8981\u8003\u8651\u91cf\u4ea7\u5dee\u5f02\u548c\u9ad8\u6e29\u52a3\u5316\u7684\u5e94\u7528\u573a\u666f\uff08\u6700\u5dee\u6761\u4ef6\u4e0b\u7684\u635f\u8017\u8ba1\u7b97\uff09\u4e2d\uff0c\u4e0d\u5efa\u8bae\u76f4\u63a5\u4f7f\u7528\u5178\u578b\u503c\u3002<\/p>\n<p>&nbsp;<\/p>\n<h2 id=\"toc9\">\u5bfc\u901a\u635f\u8017\u7684\u5b9e\u9645\u8ba1\u7b97\u65b9\u6cd5\uff08\u7ed3\u5408\u5360\u7a7a\u6bd4\u548c\u6e29\u5ea6\uff09<\/h2>\n<h3 id=\"toc10\">\u57fa\u672c\u516c\u5f0f\uff1a\u5bfc\u901a\u635f\u8017\u4e3a \\(I^2\\) \u00d7 \\(R_{DS(on)}\\)<\/h3>\n<p>MOSFET\u7684\u5bfc\u901a\u635f\u8017\uff0c\u57fa\u672c\u4e0a\u53ef\u4ee5\u901a\u8fc7\u4e0b\u5217\u516c\u5f0f\u6c42\u5f97\uff1a<\/p>\n<p><!-- \u6570\u5f0f --><\/p>\n<p><span class=\"mathjax-text\">\\(P_D =I^2\u00d7R_{DS(on)} \\)<\/span><\/p>\n<p>\u5176\u4e2d\uff0cI\u8868\u793a\u5728\u5bfc\u901a\u72b6\u6001\u4e0b\u6d41\u7ecfMOSFET\u7684\u7535\u6d41\u3002<\/p>\n<h3 id=\"toc11\">\u7ed3\u5408\u5360\u7a7a\u6bd4\u548c\u6709\u6548\u503c\uff08IRMS\uff09\u8ba1\u7b97\u5e73\u5747\u635f\u8017<\/h3>\n<p>\u5728\u7535\u8def\u8bbe\u8ba1\u4e2d\uff0c\u672a\u5fc5\u603b\u662f\u5728\u6052\u6d41\u6052\u538b\u72b6\u6001\u4e0b\u5de5\u4f5c\uff08\u76f4\u6d41\u7535\u8def\uff09\u3002\u5728\u8fdb\u884cPWM\u9a71\u52a8\u6216\u65ad\u7eed\u5de5\u4f5c\u65f6\uff0c\u9700\u8981\u8003\u8651\u5230MOSFET\u5bfc\u901a\u65f6\u95f4\u6240\u5360\u7684\u6bd4\u4f8b\uff08\u5360\u7a7a\u6bd4\uff09\u3002\u56e0\u6b64\uff0c\u5e73\u5747\u5bfc\u901a\u635f\u8017\u53ef\u901a\u8fc7\u4e0b\u9762\u7684\u516c\u5f0f\u6c42\u5f97\uff1a<\/p>\n<p><!-- \u6570\u5f0f --><\/p>\n<p><span class=\"mathjax-text\">\\(P_{avg} =I^2\u00d7R_{DS(on)} \u00d7D\\)<\/span><\/p>\n<p>\u5176\u4e2d\uff0cD\u8868\u793a\u5360\u7a7a\u6bd4\uff08\u5bfc\u901a\u6bd4\u7387\uff09\u3002\u5728\u76f4\u6d41\u5de5\u4f5c\u72b6\u6001\u4e0b\uff0cD=1\uff08100%\uff09\u3002<\/p>\n<p>\u53e6\u5916\uff0c\u5982\u679c\u7535\u6d41\u53d1\u751f\u53d8\u5316\uff0c\u5219\u5e94\u4f7f\u7528\u5bfc\u901a\u671f\u95f4\u6240\u6d41\u8fc7\u7535\u6d41\u7684\u6709\u6548\u503c\uff08IRMS\uff09\uff0c\u901a\u8fc7\u4e0b\u9762\u7684\u516c\u5f0f\u6c42\u5f97\uff1a<\/p>\n<p><!-- \u6570\u5f0f --><\/p>\n<p><span class=\"mathjax-text\">\\(P_{avg} =I_{RMS}^2\u00d7R_{DS(on)} \u00d7D\\)<\/span><\/p>\n<p><!-- \u753b\u50cf --><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/techclass.wfjydl.com\/wp-content\/uploads\/2026\/08\/05-averaging-of-mosfet-conduction-loss-in-pwm-operation.png\" alt=\"PWM\u5de5\u4f5c\u4e2dMOSFET\u5bfc\u901a\u635f\u8017\u7684\u5e73\u5747\u5316\u5904\u7406\" width=\"700\" height=\"394\" \/><\/p>\n<h3 id=\"toc12\">\u6e29\u5347\u5bfc\u81f4\u7684\\(R_{DS(on)}\\)\u589e\u52a0\u7684\u90e8\u5206\uff0c\u901a\u8fc7\u201c\u6e29\u5ea6\u7cfb\u6570k\u201d\u8fdb\u884c\u8865\u507f<\/h3>\n<p>\u5728\u5b9e\u9645\u7535\u8def\u4e2d\uff0cMOSFET\u81ea\u8eab\u7684\u53d1\u70ed\u4f1a\u5bfc\u81f4\u7ed3\u6e29\uff08\\(T_J\\)\uff09\u4e0a\u5347\uff0c\u4ece\u800c\u4f7f\u5bfc\u901a\u7535\u963b\u5927\u4e8e\u89c4\u683c\u4e66\u4e2d\u7684\u503c\uff08\u901a\u5e38\u572825\u2103\u4e0b\u6d4b\u5f97\uff09\u3002\u8981\u60f3\u6b63\u786e\u4f30\u7b97\u635f\u8017\uff0c\u9700\u8981\u53c2\u8003\u6280\u672f\u89c4\u683c\u4e66\u4e2d\u7684\u6e29\u5ea6\u7279\u6027\uff0c\u5c06\\(R_{DS(on)}\\)\u7684\u589e\u52a0\u89c6\u4e3a\u201c\u6e29\u5ea6\u7cfb\u6570k\u201d\uff0c\u5e76\u91c7\u7528\u4ee5\u4e0b\u516c\u5f0f\u8fdb\u884c\u8ba1\u7b97\uff1a<\/p>\n<p><!-- \u6570\u5f0f --><\/p>\n<p><span class=\"mathjax-text\">\\(P_{avg(&#8220;\u5b9e\u9645\u5de5\u4f5c&#8221; )}\\ =I_{RMS}^2\u00d7R_{DS(on)} \u00d7D\u00d7k\\)<\/span><\/p>\n<p>\u6e29\u5ea6\u7cfb\u6570 (k) \u53ef\u6839\u636e\u6280\u672f\u89c4\u683c\u4e66\u4e2d\u7684\u6e29\u5ea6\u7279\u6027\u56fe\u8868\uff0c\u6309\u4e0b\u9762\u7684\u516c\u5f0f\u8fdb\u884c\u4f30\u7b97\u3002<\/p>\n<p>\u4f8b\u5982\uff0c\u5982\u679c25\u2103\u65f6\u7684\\(R_{DS(on)}\\)\u4e3a10m\u03a9\uff0c\u5b9e\u9645\u5de5\u4f5c\u6e29\u5ea6100\u2103\u65f6\u7684\\(R_{DS(on)}\\)\u4e3a15m\u03a9\uff0c\u5219\uff1a<\/p>\n<p><!-- \u6570\u5f0f --><\/p>\n<p><span class=\"mathjax-text\">\\(k=\\displaystyle\\frac{15}{10}=1.5\\)<\/span><\/p>\n<p>\u5728\u5b9e\u9645\u8bbe\u8ba1\u4e2d\uff0c\u9700\u8981\u9002\u5f53\u8003\u8651\u201c\u5360\u7a7a\u6bd4\u201d\u548c\u201c\u6e29\u5ea6\u7cfb\u6570\u201d\u6765\u8ba1\u7b97\u5bfc\u901a\u635f\u8017\u3002<\/p>\n<p>&nbsp;<\/p>\n<h3 id=\"toc13\">\u5c06\u5b89\u88c5\u7535\u963b\u548c\u81ea\u53d1\u70ed\uff08\u70ed\u963b\uff09\u7eb3\u5165\u4f30\u7b97<\/h3>\n<p>\u5728\u4f30\u7b97\u5bfc\u901a\u635f\u8017\u65f6\uff0c\u4e0d\u4ec5\u9700\u8981\u8003\u8651MOSFET\u7684\\(R_{DS(on)}\\)\uff0c\u7531\u5b89\u88c5\u4ea7\u751f\u7684\u4e32\u8054\u7535\u963b\uff08\u5982\u7535\u8def\u677f\u5e03\u7ebf\u3001\u8fc7\u5b54\u3001\u8fde\u63a5\u5668\u7b49\uff09\u6709\u65f6\u4e5f\u4e0d\u5bb9\u5ffd\u89c6\u3002\u5728m\u03a9\u7ea7\u7684\u5e94\u7528\u4e2d\uff0c\u7535\u8def\u6574\u4f53\u7684\u5bfc\u901a\u635f\u8017\u901a\u5e38\u53ef\u4ee5\u4f5c\u4e3a\u5408\u6210\u7535\u963b\u8fdb\u884c\u4f30\u7b97\uff0c\u5373\\(P\\) \u2248 \\(I_{RMS^2}\\) \u00d7\uff08\\(R_{DS(on)}\\)\uff0bR\u5e03\u7ebf\uff09\u00d7 D\uff0c\u8fd9\u6837\u4e0e\u8ba1\u7b97\u51fa\u7684\u503c\u4e0e\u5b9e\u9645\u8bbe\u5907\u7684\u5b9e\u6d4b\u503c\u4e4b\u95f4\u7684\u504f\u5dee\u4f1a\u66f4\u5c0f\u3002<\/p>\n<p>\u53e6\u5916\uff0c\u8981\u60f3\u6b63\u786e\u9009\u62e9\u6e29\u5ea6\u7cfb\u6570k\uff0c\u9996\u5148\u9700\u8981\u4f30\u7b97\u51fa\u5de5\u4f5c\u65f6\u7684\\(T_J\\)\uff08\u7ed3\u6e29\uff09\u3002\u6700\u7b80\u5355\u7684\u65b9\u6cd5\u662f\u4ee5\u73af\u5883\u6e29\u5ea6T&lt;sub&gt;A&lt;\/sub&gt;\u4e3a\u57fa\u51c6\uff0c\u901a\u8fc7 \\(T_J\\) \u2248 T&lt;sub&gt;A&lt;\/sub&gt; + Ptotal \u00d7 R\u03b8JA\uff08\u6216\u8005\u5982\u679c\u5df2\u77e5\u5916\u58f3\u6e29\u5ea6TC\uff0c\u5219\u4f7f\u7528TJ \u2248 TC + Ptotal \u00d7 R\u03b8JC\uff09\u6765\u4f30\u7b97\u3002\u8fd9\u91cc\u7684Ptotal\u662f\u6307\u603b\u635f\u8017\uff0c\u4e0d\u4ec5\u5305\u62ec\u5bfc\u901a\u635f\u8017\uff0c\u8fd8\u5305\u62ec\u5f00\u5173\u635f\u8017\u3002<\/p>\n<ol class=\"ordered-list\">\n<li style=\"list-style-type: none;\">\n<ol class=\"ordered-list\">\n<li>\u9996\u5148\uff0c\u6839\u636e25\u2103\u9644\u8fd1\u7684\\(R_{DS(on)}\\)\uff08\u6280\u672f\u89c4\u683c\u4e66\uff09\u8ba1\u7b97\u5bfc\u901a\u635f\u8017\uff0c\u5982\u6709\u5fc5\u8981\u518d\u52a0\u4e0a\u5f00\u5173\u635f\u8017\uff0c\u5f97\u51faP_total\u3002<\/li>\n<li>\u63a5\u4e0b\u6765\uff0c\u6839\u636eP_total\u548c\u70ed\u963bR\u03b8\u6765\u4f30\u7b97TJ\u3002<\/li>\n<\/ol>\n<\/li>\n<\/ol>\n<ol class=\"ordered-list\">\n<li>\u6700\u540e\uff0c\u6839\u636e\u6e29\u5ea6\u7279\u6027\u66f4\u65b0\u4e3a\u5bf9\u5e94TJ\u7684\\(R_{DS(on)}\\)\uff08\u6e29\u5ea6\u7cfb\u6570\u500d\u7387k\uff09\uff0c\u5e76\u5728\u5fc5\u8981\u65f6\u91cd\u65b0\u8ba1\u7b97P_total\u3002<\/li>\n<\/ol>\n<p>\u50cf\u8fd9\u6837\u901a\u8fc7\u54ea\u6015\u4e00\u6b21\u201c\u635f\u8017\u2192\u6e29\u5ea6\u2192\\(R_{DS(on)}\\)\u201d\u7684\u8fed\u4ee3\u6536\u655b\uff0c\u5c31\u80fd\u66f4\u8f7b\u677e\u5730\u83b7\u5f97\u5305\u542b\u6e29\u5347\u5728\u5185\u7684\u8bbe\u8ba1\u88d5\u91cf\u3002<\/p>\n<p>&nbsp;<\/p>\n<h2 id=\"toc14\">\u4e0d\u80fd\u4ec5\u51ed\u5bfc\u901a\u7535\u963b\u505a\u9009\u62e9\uff1a\u5bfc\u901a\u635f\u8017\u4e0e\u5f00\u5173\u635f\u8017\u7684\u6743\u8861<\/h2>\n<h3 id=\"toc15\">\u964d\u4f4e \\(R_{DS(on)}\\) \u5bb9\u6613\u5bfc\u81f4 \\(Q_g\\) \u548c\u5bc4\u751f\u7535\u5bb9\u589e\u52a0<\/h3>\n<p>\u964d\u4f4e\u5bfc\u901a\u7535\u963b\uff08\\(R_{DS(on)}\\)\uff09\u53ef\u4ee5\u51cf\u5c11\u5bfc\u901a\u635f\u8017\uff08\\(I^2R\\)\uff09\uff0c\u4f46\u5728\u67d0\u4e9b\u5e94\u7528\u4e2d\uff0c\u5f00\u5173\u635f\u8017\u7684\u5f71\u54cd\u4e5f\u4e0d\u5bb9\u5ffd\u89c6\u3002\u901a\u5e38\uff0c\u964d\u4f4e\u5bfc\u901a\u7535\u963b\u5f80\u5f80\u4f34\u968f\u7740\u82af\u7247\u9762\u79ef\u7684\u589e\u52a0\uff0c\u8fd9\u6700\u7ec8\u4f1a\u5bfc\u81f4\u6805\u6781\u7535\u8377\\(Q_g\\)\u548c\u5bc4\u751f\u7535\u5bb9\u589e\u52a0\uff0c\u4ece\u800c\u53ef\u80fd\u5f15\u8d77\u5f00\u5173\u635f\u8017\u548c\u6805\u6781\u9a71\u52a8\u635f\u8017\u4e0a\u5347\u3002<\/p>\n<h3 id=\"toc16\">\u901a\u8fc7\\(R_{DS(on)}\\)\u00d7\\(Q_g\\)\uff08\u6216 \\(R_{DS(on)}\\)\u00d7\\(Q_{gd}\\)\uff09\u6743\u8861\u8003\u91cf<\/h3>\n<p>\u5c24\u5176\u5728\u5f00\u5173\u9891\u7387\u8f83\u9ad8\u7684\u7535\u6e90\u7535\u8def\u4e2d\uff0c\u4e0d\u5e94\u4ec5\u5173\u6ce8\\(R_{DS(on)}\\)\uff0c\u8fd8\u5e94\u901a\u8fc7\u8bf8\u5982\\(R_{DS(on)}\\)\u00d7\\(Q_g\\)\uff08\u6216\\(R_{DS(on)}\\)\u00d7\\(Q_{gd}\\)\uff09\u8fd9\u7c7b\u6307\u6807\u6765\u770b\u201c\u5bfc\u901a\u635f\u8017\u4e0e\u5f00\u5173\u635f\u8017\u7684\u5e73\u8861\u201d\uff0c\u8fd9\u6837\u66f4\u5bb9\u6613\u9009\u62e9\u603b\u635f\u8017\u6700\u5c0f\u7684\u5668\u4ef6\u3002\u5bfc\u901a\u7535\u963b\u6700\u5c0f\u7684\u5668\u4ef6\uff0c\u672a\u5fc5\u80fd\u4f7f\u7535\u8def\u6574\u4f53\u7684\u635f\u8017\u6700\u5c0f\uff0c\u8fd9\u662f\u5b9e\u9645\u5e94\u7528\u4e2d\u7684\u5173\u952e\u70b9\u3002<\/p>\n<p><!-- \u753b\u50cf --><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/techclass.wfjydl.com\/wp-content\/uploads\/2026\/08\/06-conceptual-diagram-trade-off-between-conduction-loss-and-switching-loss.png\" alt=\"\u5bfc\u901a\u635f\u8017\u4e0e\u5f00\u5173\u635f\u8017\u6743\u8861\u7684\u6982\u5ff5\u56fe\" width=\"700\" height=\"394\" \/><\/p>\n<p>&nbsp;<\/p>\n<h2 id=\"toc17\">\u5c01\u88c5\u5bf9\u5bfc\u901a\u7535\u963b\u503c\u7684\u6bd4\u8f83<\/h2>\n<h3 id=\"toc18\">\u82af\u7247\u5c3a\u5bf8\uff08\u8868\u9762\u79ef\uff09\u4e0e\u5c01\u88c5\u5c3a\u5bf8\u7684\u5173\u7cfb<\/h3>\n<p>\u7ecf\u5e38\u542c\u5230\u201c\u5c01\u88c5\u8d8a\u5927\u5bfc\u901a\u7535\u963b\u8d8a\u5c0f\u201d\u7684\u8bf4\u6cd5\uff0c\u4f46\u8fd9\u91cc\u8d77\u4e3b\u8981\u4f5c\u7528\u7684\u5e76\u975e\u201c\u5c01\u88c5\u8868\u9762\u79ef\u672c\u8eab\u201d\uff0c\u800c\u662f\u8be5\u5c01\u88c5\u4e2d\u80fd\u5bb9\u7eb3\u7684\u7845\u82af\u7247\uff08Die\uff09\u7684\u6709\u6548\u9762\u79ef\u3002\u7531\u4e8e\u529f\u7387MOSFET\u91c7\u7528\u7684\u662f\u5927\u91cf\u5355\u5143\u5e76\u8054\u7684\u7ed3\u6784\uff0c\u56e0\u6b64\u82af\u7247\u9762\u79ef\u8d8a\u5927\uff0c\u7535\u6d41\u8def\u5f84\u7684\u5e76\u8054\u6570\u91cf\u5c31\u8d8a\u591a\uff0c\u6700\u7ec8\u5bfc\u81f4\\(R_{DS(on)}\\)\u66f4\u5bb9\u6613\u964d\u4f4e\u3002<\/p>\n<p>\u53e6\u5916\uff0c\u6280\u672f\u89c4\u683c\u4e66\u4e2d\u8bb0\u8f7d\u7684\\(R_{DS(on)}\\)\u5e76\u975e\u4ec5\u6307\u7845\u82af\u7247\u5185\u90e8\u7684\u7535\u963b\uff0c\u800c\u662f\u6d4b\u91cf\u81ea\u6f0f\u6781\u5f15\u811a\u81f3\u6e90\u6781\u5f15\u811a\u7684\u7535\u6d41\u8def\u5f84\u4e2d\u6240\u5305\u542b\u7535\u963b\u7684\u603b\u548c\uff08\u5f15\u811a\u95f4\u7535\u963b\uff09\u6240\u5f97\u7684\u503c\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c\u5176\u4e2d\u5305\u62ec\u82af\u7247\u5185\u90e8\u7684\u6c9f\u9053\u7535\u963b\u3001\u6f02\u79fb\u5c42\u7535\u963b\u3001\u91d1\u5c5e\u5e03\u7ebf\u7535\u963b\uff0c\u4ee5\u53ca\u5c01\u88c5\u4fa7\u7684\u5f15\u7ebf\u6846\u67b6\/\u952e\u5408\u7ebf\uff08\u6216\u94dc\u5939\u7247\uff09\u548c\u5f15\u811a\u710a\u76d8\u7684\u7535\u963b\uff0c\u6240\u6709\u8fd9\u4e9b\u7684\u603b\u548c\u3002\u56e0\u6b64\uff0c\u5982\u679c\u5c01\u88c5\u6539\u53d8\uff0c\u4e0d\u4ec5\u53ef\u5bb9\u7eb3\u82af\u7247\u9762\u79ef\u7684\u4e0a\u9650\u4f1a\u6539\u53d8\uff0c\u800c\u4e14\u53d7\u5c01\u88c5\u81ea\u8eab\u7684\u7535\u963b\u548c\u6563\u70ed\u6027\u80fd\u4e24\u4e2a\u65b9\u9762\u7684\u5f71\u54cd\uff0c\\(R_{DS(on)}\\) \u4e5f\u4f1a\u53d1\u751f\u53d8\u5316\u3002<\/p>\n<p><!-- \u753b\u50cf --><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/techclass.wfjydl.com\/wp-content\/uploads\/2026\/08\/07-relationship-between-die-size-and-package-size.png\" alt=\"\u82af\u7247\u5c3a\u5bf8\u4e0e\u5c01\u88c5\u5c3a\u5bf8\u7684\u5173\u7cfb\" width=\"700\" height=\"394\" \/><\/p>\n<p>&nbsp;<\/p>\n<h3 id=\"toc19\">\u5927\u7535\u6d41\u5e94\u7528\u4e2d\u5f15\u811a\u7ed3\u6784\u548c\u5e03\u5c40\uff08\u5f00\u5c14\u6587\u6e90\u6781\uff09\u7684\u4f5c\u7528<\/h3>\n<p>\u5728m\u03a9\u7ea7\u7684\u5927\u7535\u6d41\u5f00\u5173\u4e2d\uff0c\u7531\u4e8e\u7535\u8def\u677f\u5e03\u7ebf\u548c\u5c01\u88c5\u7684\u7535\u611f\uff08\u5c01\u88c5\u5bc4\u751f\u7535\u611f\uff08\u516c\u5171\u6e90\u6781\u7535\u611f\uff09\u7684\u5f71\u54cd\uff0c\u6e90\u6781\u7535\u4f4d\u4f1a\u53d1\u751f\u6ce2\u52a8\uff0c\u4ece\u800c\u5bfc\u81f4\u8868\u8c61\u4e0a\\(V_{GS}\\)\u4e0b\u964d\uff0c\u5bfc\u901a\u72b6\u6001\u6076\u5316\u3002\u4e3a\u6291\u5236\u8fd9\u4e00\u5f71\u54cd\uff0c\u6709\u6548\u7684\u65b9\u6cd5\u5305\u62ec\u91c7\u7528\u652f\u6301\u5f00\u5c14\u6587\u6e90\u6781\u7684\u5c01\u88c5\uff08\u53ef\u5c06\u529f\u7387\u6e90\u6781\u5f15\u811a\u4e0e\u6805\u6781\u9a71\u52a8\u57fa\u51c6\u6e90\u6781\u5206\u79bb\uff09\uff0c\u4ee5\u53ca\u5c06\u6805\u6781\u53cd\u9988\uff08\u6e90\u6781\uff09\u5e03\u7ebf\u4ece\u7535\u6e90\u73af\u8def\u4e2d\u5206\u79bb\u51fa\u6765\u7684\u5e03\u5c40\u8bbe\u8ba1\u3002\u5728\u8bc4\u4f30\u65f6\u4e0d\u4ec5\u8981\u5173\u6ce8\\(R_{DS(on)}\\)\u7684\u6570\u503c\u6307\u6807\uff0c\u8fd8\u9700\u7efc\u5408\u8003\u91cf\u5f15\u811a\u7ed3\u6784\u548c\u5b9e\u9645\u5b89\u88c5\u4fbf\u5229\u6027\uff0c\u8fd9\u6837\u624d\u80fd\u6709\u6548\u51cf\u5c11\u5b9e\u9645\u5b89\u88c5\u540e\u7684\u6027\u80fd\u6ce2\u52a8\u3002<\/p>\n<p><strong>\u76f8\u5173\u6587\u7ae0<\/strong><br \/>\n<a href=\"https:\/\/techclass.wfjydl.com\/knowledge\/transistors-diodes\/transistors\/23714\/\">\u6676\u4f53\u7ba1\u8be6\u89e3\uff1a\u7ed3\u6784\u3001\u5206\u7c7b\u53ca\u5de5\u4f5c\u539f\u7406\u57fa\u7840<\/a><br \/>\n<a href=\"https:\/\/techclass.wfjydl.com\/knowledge\/transistors\/transistors-basic\/5277\/\">MOSFET\u57fa\u7840\uff5c\u5bc4\u751f\u7535\u5bb9\u3001Qg\u3001\u7c73\u52d2\u5e73\u53f0\u3001\u9608\u503c<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"MOSFET\u7684\u5bfc\u901a\u7535\u963b\uff08\\(R_{DS(on)}\\)\uff09\u662f\u6307MOSFET\u5904\u4e8e\u5bfc\u901a\u72b6\u6001\u65f6\u6f0f\u6781\u4e0e\u6e90\u6781\u4e4b\u95f4\u7684\u7535\u963b\uff0c\u662f\u5f71\u54cd\u5bfc\u901a\u635f\u8017\u548c\u53d1\u70ed\u7684\u91cd\u8981\u53c2\u6570\u3002\u5bfc\u901a\u7535\u963b\uff08\\(R_{DS(on)}\\)\uff09\u4f1a\u968f\u7740\u6805\u6781-\u6e90\u6781\u7535\u538b\uff08\\(V_{GS}\\) [&hellip;]","protected":false},"author":4,"featured_media":30402,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[2713],"tags":[],"class_list":["post-30396","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-transistors-basic"],"acf":[],"wps_subtitle":"","_links":{"self":[{"href":"https:\/\/techclass.wfjydl.com\/wp-json\/wp\/v2\/posts\/30396","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/techclass.wfjydl.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/techclass.wfjydl.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/techclass.wfjydl.com\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/techclass.wfjydl.com\/wp-json\/wp\/v2\/comments?post=30396"}],"version-history":[{"count":12,"href":"https:\/\/techclass.wfjydl.com\/wp-json\/wp\/v2\/posts\/30396\/revisions"}],"predecessor-version":[{"id":30435,"href":"https:\/\/techclass.wfjydl.com\/wp-json\/wp\/v2\/posts\/30396\/revisions\/30435"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/techclass.wfjydl.com\/wp-json\/wp\/v2\/media\/30402"}],"wp:attachment":[{"href":"https:\/\/techclass.wfjydl.com\/wp-json\/wp\/v2\/media?parent=30396"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/techclass.wfjydl.com\/wp-json\/wp\/v2\/categories?post=30396"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/techclass.wfjydl.com\/wp-json\/wp\/v2\/tags?post=30396"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}