{"id":21669,"date":"2022-01-06T10:00:40","date_gmt":"2022-01-06T02:00:40","guid":{"rendered":"https:\/\/www.paiqinano.com\/?p=21669"},"modified":"2022-01-04T14:40:51","modified_gmt":"2022-01-04T06:40:51","slug":"%e7%94%b5%e8%b7%af%e6%9d%bf%e7%a9%ba%e9%97%b4%e4%b8%8d%e8%b6%b3%e6%97%b6%ef%bc%8cic%e5%b7%a5%e8%89%ba%e6%80%8e%e4%b9%88%e8%a7%a3%e5%86%b3%e9%97%ae%e9%a2%98%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.paiqinano.com\/?p=21669","title":{"rendered":"\u7535\u8def\u677f\u7a7a\u95f4\u4e0d\u8db3\u65f6\uff0cIC\u5de5\u827a\u600e\u4e48\u89e3\u51b3\u95ee\u9898\uff1f"},"content":{"rendered":"<p>IC \u52a0\u5de5\u5de5\u827a\u51e0\u4f55\u56fe\u5f62\u5916\u5f62\u5c3a\u5bf8\u7684\u65e5\u76ca\u53d8\u5c0f\u4fc3\u8fdb\u73b0\u5982\u4eca\u7535\u5b50\u8bbe\u5907\u7684\u5de5\u4f5c\u4e2d\u7535\u6d41\u81f3\u8fdc\u8fdc\u5730\u5c0f\u4e8e 2V \u7684\u6c34\u51c6\uff0c\u4ece\u800c\u4ea7\u751f\u4e86\u4f17\u591a\u7684\u8bbe\u8ba1\u65b9\u6848\u8bd5\u70bc\u3002\u4e00\u4e2a\u666e\u904d\u7684\u95ee\u9898\u662f\u5fc5\u987b\u597d\u51e0\u4e2a\u7535\u6e90\u7535\u538b\uff0c\u6bd4\u5982\uff1a\u4e00\u4e2a\u5de5\u4f5c\u7535\u538b\u7528\u4ee5 CPU \u6838\u5fc3\uff0c\u53e6\u4e00\u4e2a\u5de5\u4f5c\u7535\u538b\u7528\u4ee5 I\/O\uff0c\u4e5f\u6709\u5176\u4ed6\u4e00\u4e9b\u5de5\u4f5c\u7535\u538b\u5219\u7528\u4ee5\u5916\u63a5\u8bbe\u5907\u3002\u6bd4\u8f83\u654f\u611f\u7684 RF\u3001\u58f0\u9891\u548c\u6a21\u62df\u4eff\u771f\u7535\u6e90\u7535\u8def\u6709\u53ef\u80fd\u5fc5\u987b\u6b64\u5916\u7684\u4e13\u7528\u578b\u4f4e\u566a\u97f3\u5f00\u5173\u7535\u6e90 (\u8fd9\u79cd\u5f00\u5173\u7535\u6e90\u4e0e\u8fd9\u4e9b\u5bf9\u566a\u97f3\u4e0d\u7279\u522b\u654f\u611f\u7684\u6570\u5b57\u7535\u8def\u8bbe\u8ba1\u662f\u5206\u79bb\u7684)\u3002\u4f34\u968f\u7740\u5f00\u5173\u7535\u6e90\u6570\u989d\u7684\u63d0\u5347\uff0c\u4e3a\u6bcf\u4e00\u4e2a\u5de5\u4f5c\u7535\u538b\u548c\u5177\u5907\u7279\u522b\u8981\u6c42\u7684\u5206\u7cfb\u7edf\u5e94\u7528\u4e00\u4e2a\u76f4\u63a5\u7684\u5f00\u5173\u7535\u6e90 IC \u8d8a\u6765\u8d8a\u8131\u79bb\u5b9e\u9645\u3002\u7ebf\u8def\u677f\u7684\u603b\u9762\u79ef\u5c06\u8fc5\u901f\u7684\u88ab\u65e5\u6e10\u589e\u52a0\u7684\u5f00\u5173\u7535\u6e90\u6240\u5360\u6709\u3002\u5bf9\u4e8e\u5185\u5b58\u4e0d\u8db3\u7684\u4e00\u79cd\u89e3\u51b3\u65b9\u6cd5\u662f\u4f7f\u7528\u4e00\u4e2a\u4e09\u8def\u7a33\u538b\u7535\u6e90 (\u6bd4\u5982\uff1aLTC\u00ae3446\uff0c\u53ef\u7531\u5355\u73e0 IC \u96c6\u6210ic\u7ed9\u4e88 3 \u79cd\u5de5\u4f5c\u7535\u538b) \u6765\u5b8c\u6210\u5f00\u5173\u7535\u6e90\u96c6\u6210\u5316\u3002<\/p>\n<p>\u5185\u653e\u7f6e\u4e00\u4e2a\u7ea4\u67d4\u578b\u5c01\u88c5\u5f62\u5f0f\u4e2d\u7684\u4e09\u8def\u5f00\u5173\u7535\u6e90<\/p>\n<p>LTC3446 \u96c6\u6210\u5316\u4e86\u4e00\u4e2a 1A \u540c\u6b69\u964d\u8840\u538b\u578b\u7a33\u538b\u7535\u6e90\u548c2\u4e2a 300mA \u5341\u5206\u4f4e\u7535\u538b\u5dee VLDO&#x2122; \u7ebf\u5f62\u7a33\u538b\u7535\u6e90\uff0c\u4ee5\u4ece\u5355\u72ec\u4e00\u4e2a\u952e\u5165\u5de5\u4f5c\u7535\u538b\u7ed9\u4e88\u9ad8\u8fbe\u4e09\u79cd\u964d\u8840\u538b\u8f93\u51fa\u7535\u538b\uff0c\u8be5\u5143\u5668\u4ef6\u9009\u7528\u4e86\u7ea4\u67d4\u578b 3mm x 4mm DFN \u5c01\u88c5\u5f62\u5f0f\u30022.7V \u81f3 5.5V \u7684\u952e\u5165\u7535\u6d41\u7535\u538b\u8303\u7574\u7279\u522b\u9002\u5408\u4e8e\u78f7\u9178\u94c1\u9502\/\u9502\u805a\u5408\u7269\u7535\u6c60\u914d\u7535\u578b\u8fd0\u7528\uff0c\u53ca\u5176\u4ece 5V \u6216 3.3V \u5f00\u5173\u7535\u6e90\u8f68\u6765\u4e3a\u4f4e\u538b\u65f6\u5e8f\u903b\u8f91\u7535\u8def\u914d\u7535\u3002\u8f93\u51fa\u7535\u538b\u8303\u7574\u5f80\u4e0b\u62d3\u5c55\u81f3 0.4V (\u7528\u4ee5 VLDO \u7a33\u538b\u7535\u6e90) \u548c 0.8V (\u7528\u4ee5\u964d\u8840\u538b\u578b\u8f6c\u5316\u5668)\u3002<\/p>\n<p>\u6bcf\u4e00\u4e2a\u5bfc\u51fa\u5747\u6839\u636e\u5176\u81ea\u8eab\u7684\u4e5f\u5c31\u80fd\u7ba1\u811a\u6765\u5355\u72ec\u5730\u5f00\u542f\u6216\u5173\u95ed\u3002\u5f53\u5168\u90e8\u7684\u5bfc\u51fa\u5747\u88ab\u5173\u95ed\u65f6\uff0cVIN \u9759\u6001\u6570\u636e\u7535\u6d41\u91cf\u5c06\u964d\u5230 1\u03bcA \u6216\u66f4\u4f4e\uff0c\u8fdb\u800c\u50a8\u5b58\u4e86\u5145\u7535\u7535\u6c60\u8f93\u51fa\u529f\u7387\u3002\u6bcf\u4e00\u4e2a\u5bfc\u51fa\u7684\u8c03\u6574\u5de5\u4f5c\u7535\u538b\u7531\u5916\u754c\u7535\u963b\u5206\u538b\u5668\u6765\u8bbe\u5b9a\u3002\u53ef\u5229\u7528\u8c03\u6574 ITH \u7ba1\u811a\u4e0a\u7684 RC \u4e92\u8054\u7f51\u6765\u4f7f\u964d\u8840\u538b\u7a33\u538b\u7535\u6e90\u73af\u57ce\u8def\u56de\u5e94\u4e0e\u8d1f\u8377\u76f8\u4e00\u81f4\u3002<\/p>\n<p>\u6548\u7387\u9ad8\u548c\u4f4e\u566a\u97f3<\/p>\n<p>1A \u540c\u6b69\u964d\u8840\u538b\u578b\u8f6c\u5316\u5668\u4ee5\u6548\u7387\u9ad8 (\u8fbe 90%) \u7ed9\u4e88\u4e86\u4e3b\u5bfc\u51fa\u3002\u8be5\u964d\u8840\u538b\u578b\u8f6c\u5316\u5668\u5b9e\u884c 2.25MHz \u7684\u5300\u901f\u8fd0\u52a8\u5de5\u4f5c\u9891\u7387\u7535\u6d41\u91cf\u65b9\u5f0f\u5b9e\u9645\u64cd\u4f5c\uff0c\u56e0\u6b64\u5bb9\u8bb8\u5e94\u7528\u5c0f\u7684\u53d8\u538b\u5668\u548c\u7535\u611f\u30022\u4e2a 300mA VLDO \u7a33\u538b\u7535\u6e90\u53ef\u4ee5\u76f8\u4e92\u8fde\u63a5\uff0c\u4ee5\u628a\u964d\u8840\u538b\u8f6c\u5316\u5668\u5bfc\u51fa\u505a\u4e3a\u5de5\u4f5c\u4e2d\u5f00\u5173\u7535\u6e90\uff0c\u4ee5\u7ed9\u4e882\u4e2a\u9644\u52a0\u7684\u8f83\u4f4e\u538b\u5bfc\u51fa\u3002\u90a3\u6837\uff0c\u964d\u8840\u538b\u8f6c\u5316\u5668\u5c06\u4ee5\u6548\u7387\u9ad8 (\u8fd9\u4e5f\u662f\u7535\u6e90\u5f00\u5173\u7a33\u538b\u7535\u6e90\u7684\u7279\u70b9) \u6765\u5b9e\u884c\u7edd\u5927\u591a\u6570\u964d\u8840\u538b\u5b9e\u9645\u64cd\u4f5c\uff0c\u800c VLDO \u7a33\u538b\u7535\u6e90\u5219\u4ee5\u4e0a\u4f73\u7684\u6548\u679c\u548c\u975e\u5e38\u4f4e\u7684\u566a\u97f3\u8109\u51b2\u4fe1\u53f7 (\u8fd9\u4e5f\u662f\u7ebf\u5f62\u7a33\u538b\u7535\u6e90\u7684\u7279\u70b9) \u7ed9\u4e88\u4e86\u9644\u52a0\u7684\u8f83\u4f4e\u538b\u3002<\/p>\n<p>\u56fe 1 \u4e2d\u7684\u7535\u8def\u8bbe\u8ba1\u56fe\u6807\u660e\u4e86 LTC3446 \u88ab\u914d\u5907\u4e3a\u4ece\u964d\u8840\u538b\u7a33\u538b\u7535\u6e90\u7ed9\u4e88 1.8V \u5bfc\u51fa\u3001\u4ece\u7b2c\u4e00\u4e2a VLDO \u7a33\u538b\u7535\u6e90\u7ed9\u4e88 1.5V \u5bfc\u51fa\u3001\u4ece\u7b2c\u4e8c\u4e2a VLDO \u7a33\u538b\u7535\u6e90\u7ed9\u4e88 1.2V \u5bfc\u51fa\u65f6\u7684\u60c5\u51b5\u3002\u56fe 2 \u793a\u51fa\u4e86\u5b89\u88c5\u5728\u4e00\u5757\u5370\u5237\u7ebf\u8def\u677f\u4e0a\u7684\u56fe 1 \u7535\u6e90\u7535\u8def\u3002<\/p>\n<p><img decoding=\"async\" src=\"\/wp-content\/uploads\/2021\/12\/20211215132238-61b9ec1ee89fb.jpg\" border=\"0\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"\/wp-content\/uploads\/2021\/12\/20211215132239-61b9ec1f14755.jpg\" alt=\"\u88c5\u914d\u5728\u4e00\u5757\u5370\u5237\u7535\u8def\u677f\u4e0a\u7684 LTC3446 \u4e09\u8def\u7535\u6e90\" width=\"334\" height=\"256\" \/><\/p>\n<p>\u56fe 2\uff1a\u5b89\u88c5\u5728\u4e00\u5757\u5370\u5237\u7ebf\u8def\u677f\u4e0a\u7684 LTC3446 \u4e09\u8def\u5f00\u5173\u7535\u6e90<\/p>\n<p>\u5728\u8f7b\u8d1f\u8377\u6807\u51c6\u4e0b\u53ef\u6311\u9009\u5b9e\u884c\u7a81\u53d1\u6027\u65b9\u5f0f (Burst Mode\u00ae) \u5b9e\u9645\u64cd\u4f5c\u6216\u5355\u8109\u51b2\u5f39\u8df3\u5b9e\u9645\u64cd\u4f5c<\/p>\n<p>LTC3446 \u7684\u964d\u8840\u538b\u578b\u7a33\u538b\u7535\u6e90\u5177\u5907\u7a81\u53d1\u6027\u65b9\u5f0f\u5b9e\u9645\u64cd\u4f5c\u4f5c\u7528\uff0c\u5728\u8f7b\u8d1f\u8377\u6807\u51c6\u4e0b\u8fd0\u884c\u65f6\u53ef\u5b8c\u6210\u6700\u597d\u7684\u9ad8\u6548\u7387\uff0c\u56e0\u6b64\u52aa\u529b\u7684\u7ed3\u679c\u662f\u5bfc\u51fa\u8c10\u6ce2\u5931\u771f\u6269\u5927\uff0c\u5e76\u9020\u6210\u4e86\u5c0f\u4e8e 2.25MHz \u65f6\u949f\u9891\u7387\u7684\u5f00\u5173\u566a\u97f3\u3002\u53ef\u6839\u636e\u628a MODESEL \u7ba1\u811a\u62c9\u81f3\u9ad8\u7535\u5e73\u6765\u505c\u6b62\u4f7f\u7528\u7a81\u53d1\u6027\u65b9\u5f0f\u5b9e\u9645\u64cd\u4f5c\uff0c\u8fd9\u5c06\u4f7f LTC3446 \u4ee5 2.25MHz \u7684\u65f6\u949f\u9891\u7387\u6301\u7eed\u5b9e\u884c\u7535\u6e90\u5f00\u5173\u5b9e\u9645\u64cd\u4f5c (\u76f4\u5230\u8d1f\u8377\u5341\u5206\u8f7b\u7684\u524d\u63d0\u4e0b)\uff0c\u8fdb\u800c\u4f9d\u636e\u5fc5\u987b\u7ed5\u8fc7\u4e00\u4e9b\u5355\u8109\u51b2\uff0c\u4ee5\u4fdd\u6301\u7a33\u538b\u7ba1\u529f\u6548\u3002\u56fe 3 \u52fe\u52d2\u4e86\u964d\u8840\u538b\u578b\u7a33\u538b\u7535\u6e90\u7684\u9ad8\u6548\u7387\u4e0e\u8d1f\u8377\u7535\u6d41\u91cf\u7684\u5f71\u54cd\u66f2\u7ebf\u56fe\uff0c\u800c\u4e14\u793a\u51fa\u4e86\u6839\u636e\u5728\u8d1f\u8377\u7535\u6d41\u91cf\u5c0f\u4e8e 100mA \u7684\u524d\u63d0\u4e0b\u5b9e\u884c\u7a81\u53d1\u6027\u65b9\u5f0f\u5b9e\u9645\u64cd\u4f5c\u800c\u5b8c\u6210\u7684\u5178\u578b\u6027\u9ad8\u6548\u7387\u63d0\u9ad8\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"\/wp-content\/uploads\/2021\/12\/20211215132239-61b9ec1f2d55c.jpg\" alt=\"LTC3446 \u7684\u964d\u538b\u578b\u7a33\u538b\u5668\u4e0e\u8d1f\u8f7d\u7535\u6d41\u7684\u5173\u7cfb\u66f2\u7ebf\" width=\"304\" height=\"275\" \/><\/p>\n<p>\u56fe 3\uff1aLTC3446 \u7684\u964d\u8840\u538b\u578b\u7a33\u538b\u7535\u6e90\u4e0e\u8d1f\u8377\u7535\u6d41\u91cf\u7684\u5f71\u54cd\u66f2\u7ebf\u56fe<\/p>\n<p>\u5341\u5206\u4f4e\u7535\u538b\u5dee (VLDO) \u7ebf\u5f62\u7a33\u538b\u7535\u6e90<\/p>\n<p>LTC3446 \u4e2d\u7684 VLDO 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