脉冲充电器UC3842A贴片第7脚接三级管是啥作用，三级管是啥型号。请知道的大神指点一下？ 电动车充电器中UC3842B各脚电压是多少？
\u7535\u52a8\u8f66\u5145\u7535\u5668UC3842\uff0c7\u811a\u7535\u538b\u4e3a13v\u30028\u811a\u65e0\u7535\u538b\u662f\u4ec0\u4e48\u539f\u56e0\u5145\u7535\u5668\u8f93\u5165\u5f00\u8def\u6216\u8005\u5f00\u5173\u7535\u8def\u4e0d\u80fd\u5de5\u4f5c\u3002\u7528\u6237\u66f4\u6362\u5145\u7535\u5668\u5373\u53ef\u3002
\u82e5\u5145\u7535\u5668\u65e0\u8f93\u51fa\uff0c\u53ef\u4ee5\u6839\u636e\u7535\u6e90\u6307\u793a\u706f\u7684\u53d1\u5149\u72b6\u51b5\u5224\u65ad\u6545\u969c\u90e8\u4f4d\u3002\u8fd9\u79cd\u7535\u52a8\u8f66\u5145\u7535\u5668\u7ef4\u4fee\u5206\u4e24\u79cd\u60c5\u51b5\uff0c\u7535\u52a8\u8f66\u5982\u679c\u7535\u6e90\u6307\u793a\u706f\u4e0d\u4eae\uff0c\u8bf4\u660e\u5145\u7535\u5668\u8f93\u5165\u5f00\u8def\u6216\u8005\u5f00\u5173\u7535\u8def\u4e0d\u80fd\u5de5\u4f5c\u3002
\u5982\u679c\u7535\u6e90\u6307\u793a\u706f\u53d1\u5149\u6b63\u5e38\uff0c\u800c\u5145\u7535\u6307\u793a\u706f\u4e0d\u4eae\u6216\u5145\u7535\u6307\u793a\u706f\u5728\u63a5\u5165\u7535\u6c60\u65f6\u4e0d\u53d8\u8272\uff0c\u8bf4\u660e\u9ad8\u538b\u90e8\u5206\u5f00\u5173\u7535\u8def\u5de5\u4f5c\uff0c\u6545\u969c\u51fa\u73b0\u5728\u4f4e\u538b\u6574\u6d41\u548c\u5145\u7535\u8f93\u51fa\u90e8\u5206\u3002\u5bf9\u4e8e\u786e\u5b9a\u635f\u574f\u7684\u5143\u4ef6\u8fdb\u884c\u66f4\u6362\uff0c\u5bf9\u4e8e\u6000\u7591\u800c\u5c1a\u672a\u786e\u5b9a\u7684\u5143\u5668\u4ef6\uff0c\u91c7\u7528\u66ff\u6362\u8fdb\u4e00\u6b65\u786e\u5b9a\u635f\u574f\u7684\u5143\u5668\u4ef6\u540e\u66f4\u6362\u5143\u5668\u4ef6\u3002
\u6269\u5c55\u8d44\u6599
\u5145\u7535\u5668\u7684\u6ce8\u610f\u4e8b\u9879
1\u3001\u5145\u7535\u73af\u5883
\u7535\u52a8\u8f66\u5145\u7535\u5668\u7684\u8bbe\u8ba1\u662f\u6839\u636e\u73af\u5883\u6e29\u5ea625\u2103\uff0c\u6240\u4ee5\u572825\u2103\u6761\u4ef6\u4e0b\u5145\u7535\u6bd4\u8f83\u597d\u3002\u7136\u800c\uff0c\u5f53\u73af\u5883\u6e29\u5ea6\u786e\u5b9e\u662f25\u6444\u6c0f\u5ea6\u65f6\uff0c\u73af\u5883\u6e29\u5ea6\u76f8\u5bf9\u8f83\u5c0f\uff0c\u56e0\u6b64\u5728\u51ac\u5b63\u5145\u7535\u4e0d\u8db3\u65f6\u5fc5\u7136\u5b58\u5728\u590f\u5b63\u8fc7\u5145\u7535\u7684\u95ee\u9898\u3002\u56e0\u6b64\uff0c\u5728\u5145\u7535\u65f6\uff0c\u6700\u597d\u5c06\u7535\u6c60\u548c\u5145\u7535\u5668\u5e03\u7f6e\u5728\u901a\u98ce\u548c\u5ba4\u6e29\u73af\u5883\u4e2d\u3002
2\u3001\u5145\u7535\u65f6\u95f4
\u4e3a\u4e86\u7701\u4e8b\uff0c\u5f88\u591a\u7528\u6237\u4f1a\u9009\u62e9\u591c\u95f4\u7ed9\u7535\u52a8\u8f66\u5145\u7535\uff0c\u7ecf\u5e38\u4e00\u5145\u5c31\u662f\u4e00\u4e2a\u665a\u4e0a\uff0c\u5145\u7535\u5668\u957f\u65f6\u95f4\u5de5\u4f5c\u6781\u6613\u53d1\u70ed\u53d7\u635f\uff0c\u7535\u6c60\u4e5f\u4f1a\u56e0\u7ecf\u5e38\u8fc7\u5145\u800c\u53d8\u9f13\u3002\u8981\u60f3\u4fdd\u62a4\u5145\u7535\u5668\u548c\u7535\u6c60\uff0c\u5ef6\u957f\u5176\u5bff\u547d\uff0c\u6700\u597d\u5c06\u5145\u7535\u65f6\u95f4\u4fdd\u6301\u57288-10\u5c0f\u65f6\u4e4b\u5185\uff0c\u9632\u6b62\u5145\u7535\u65f6\u95f4\u8fc7\u957f\u3002
3\u3001\u907f\u514d\u98a0\u7c38
\u5f88\u591a\u7528\u6237\u4e3a\u4e86\u65b9\u4fbf\u5145\u7535\uff0c\u7535\u52a8\u8f66\u5145\u7535\u5668\u968f\u8f66\u643a\u5e26\uff0c\u8fd9\u6837\u505a\u867d\u7136\u65b9\u4fbf\u4e86\u81ea\u5df1\uff0c\u4f46\u5f80\u5f80\u4f1a\u5e26\u6765\u4e00\u4e9b\u95ee\u9898\u3002\u5145\u7535\u5668\u6280\u672f\u7b80\u5355\uff0c\u957f\u65f6\u95f4\u9707\u52a8\u53ef\u80fd\u4f1a\u635f\u574f\u5145\u7535\u5668\u5185\u7684\u5143\u4ef6\uff0c\u6bd4\u5982\u9ad8\u9891\u53d8\u538b\u5668\u7684\u78c1\u82af\u7834\u788e\u6216\u5927\u7535\u5bb9\u8131\u843d\uff0c\u51fa\u73b0\u865a\u63a5\u7b49\u60c5\u51b5\uff0c\u5176\u5185\u90e8\u7535\u4f4d\u5668\u4f1a\u6f02\u79fb\uff0c\u4f7f\u6574\u4e2a\u53c2\u6570\u53d1\u751f\u53d8\u5316\uff0c\u5bfc\u81f4\u5145\u7535\u72b6\u6001\u5f02\u5e38\u3002
\u56e0\u6b64\u5145\u7535\u5668\u4e00\u822c\u4e0d\u5efa\u8bae\u968f\u8f66\u643a\u5e26\uff0c\u5982\u679c\u4e00\u5b9a\u8981\u643a\u5e26\uff0c\u5e94\u5305\u88f9\u7f13\u51b2\u7269\u653e\u7f6e\u5728\u8f66\u4e0a\u5de5\u5177\u7bb1\u5185\uff0c\u53ef\u4ee5\u6709\u6548\u9632\u6b62\u98a0\u7c38\u5bf9\u5145\u7535\u5668\u7684\u635f\u574f\u3002
\u53c2\u8003\u8d44\u6599\u6765\u6e90\uff1a\u767e\u5ea6\u767e\u79d1-\u6c7d\u8f66\u53d1\u52a8\u673a\u7535\u8111\u9488\u811a\u7535\u538b\u901f\u67e5\u624b\u518c
\u53c2\u8003\u8d44\u6599\u6765\u6e90\uff1a\u767e\u5ea6\u767e\u79d1-\u7535\u6e90\u6307\u793a\u706f
\u53c2\u8003\u8d44\u6599\u6765\u6e90\uff1a\u767e\u5ea6\u767e\u79d1-\u7535\u52a8\u8f66\u5145\u7535\u5668
\u4e00\u822c\u4e3a10-30V\u4e4b\u95f4\u3002
7\u4e3a\u7535\u6e90\u811a\uff0c20v\u5c5e\u6b63\u5e38\u503c\u3002\u4e00\u822c\u60c5\u51b5\uff0c\u76f4\u63a5\u6362\u4e00\u4e2a3842\uff0c\u786e\u4fddmos\u6ca1\u6709\u51fb\u7a7f\uff0c\u65ad\u5f00\u6805\u6781\uff0c\u901a\u7535\uff0c\u4e07\u7528\u8868\u6d4b\u8bd53842\u76846\u811a\u6709\u6446\u52a8\u7684\u7535\u538b\u57fa\u672c\u5c31\u53ef\u4ee5\u4e86\u3002UC3842B\u5404\u811a\u5de5\u4f5c\u7535\u538b\u5982\u4e0b:
1\u811aCOMP-OUT\uff1a3.5V\uff1b2\u811a FB(-)IN\uff1a2.5V\uff1b3\u811a LSNS-IN\uff1a0.5mV\uff1b4\u811a RT/CT\uff1a2.4V\uff1b5\u811a GND\uff1a0V\uff1b6\u811a V-OUT\uff1a1.2V\uff1b7\u811a Vcc-IN\uff1a14V\uff1b8\u811a VREF-OUT\uff1a5V\u3002
\u6269\u5c55\u8d44\u6599\uff1a\u8bbe\u8ba1\u5f00\u5173\u7535\u6e90\u6216\u7ef4\u4fee\u5f00\u5173\u7535\u6e90\u7684\u80af\u5b9a\u77e5\u9053\uff0cUC3842\u662f\u7535\u6d41\u63a7\u5236\u578b\u8109\u5bbd\u8c03\u5236\u82af\u7247\uff0c\u5355\u7aef\u8f93\u51fa\uff0c\u53ef\u4ee5\u76f4\u63a5\u9a71\u52a8\u53cc\u6781\u578b\u7684\u529f\u7387\u7ba1\u6216\u573a\u6548\u5e94\u7ba1\u3002\u8be5\u82af\u7247\u53ea\u67098\u4e2a\u5f15\u811a\uff0c\u5916\u56f4\u8bbe\u8ba1\u4e0d\u590d\u6742\uff0c\u4e13\u95e8\u4e3a\u5f00\u5173\u7535\u6e90\u8bbe\u8ba1\u7684\u4e00\u6b3e\u82af\u7247\uff0c\u5728\u8ba1\u7b97\u673a\u3001\u663e\u793a\u5668\u3001\u7535\u74f6\u5145\u7535\u5668\u7b49\u5f00\u5173\u7535\u6e90\u4e2d\u5341\u5206\u5e38\u89c1\uff0c\u4e3b\u8981\u4f5c\u4e3a\u5f00\u5173\u7535\u6e90\u7684\u9a71\u52a8\u5668\u3002
UC3842B\u82af\u7247\u5404\u5f15\u811a\u7684\u5b9a\u4e49:
1\u811a\uff1a\u662f\u8865\u507f\u811a\uff0c\u8bef\u5dee\u653e\u5927\u5668\u7684\u8f93\u51fa\u7aef\uff0c\u5916\u63a5\u963b\u5bb9\u5143\u4ef6\u7528\u4e8e\u6539\u5584\u8bef\u5dee\u653e\u5927\u5668\u7684\u589e\u76ca\u548c\u9891\u7387\u7279\u6027\uff1b
2\u811a\uff1a\u662f\u7535\u538b\u7248\u9988\u8f93\u5165\u7aef,\u6b64\u811a\u7535\u538b\u4e0e\u8bef\u5dee\u653e\u5927\u5668\u540c\u76f8\u7aef\u76842.5V\u57fa\u51c6\u7535\u538b\u8fdb\u884c\u6bd4\u8f83,\u4ea7\u751f\u8bef\u5dee\u7535\u538b,\u4ece\u800c\u63a7\u5236\u8109\u51b2\u5bbd\u5ea6\uff1b
3\u811a\uff1a\u7535\u6d41\u53d6\u6837\u8f93\u5165\u7aef\uff0c\u5f53\u68c0\u6d4b\u7535\u538b\u8d85\u8fc71V\u65f6\u7f29\u5c0f\u8109\u51b2\u5bbd\u5ea6 \u4f7f\u7535\u6e90\u5904\u4e8e\u95f4\u6b47\u5de5\u4f5c\u72b6\u6001\uff1b
4\u811a\uff1a\u5b9a\u65f6\u7aef\uff0c\u5185\u90e8\u632f\u8361\u5668\u7684\u5de5\u4f5c\u9891\u7387\u7531\u5916\u63a5\u7684\u963b\u5bb9\u65f6\u95f4\u5e38\u6570\u51b3\u5b9a\uff0cf=1.72/(RTxCT)\uff1b
6\u811a\uff1a\u63a8\u633d\u8f93\u51fa\u7aef\uff0c\u5185\u90e8\u4e3a\u56fe\u817e\u67f1\u5f0f\uff0c\u5347\u3001\u4e0b\u964d\u65f6\u95f4\u4ec5\u4e3a50ns \u9a71\u52a8\u80fd\u529b\u4e3a+1A\uff1b
7\u811a\uff1aVCC,\u5373\u4f9b\u7535\u7535\u6e90\uff0c\u7535\u538b\u8303\u56f410V~ 30V\u4ee5\u5185\uff1b
8\u811a\uff1a5V\u57fa\u51c6\u7535\u538b\u8f93\u51fa\u7aef\uff0c\u5177\u670950mA\u7684\u5e26\u8f7d\u80fd\u529b\u3002
7脚应该是芯片的供电脚，一般是没有三极管的。如果有三极管，应该是起稳压作用的。看看下面的电路图。
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