{"id":17240,"date":"2026-11-10T17:43:43","date_gmt":"2026-11-10T09:43:43","guid":{"rendered":"http:\/\/www.szryc.com\/?p=17240"},"modified":"2026-11-10T17:43:43","modified_gmt":"2026-11-10T09:43:43","slug":"mp2307dn-%e5%ba%94%e7%94%a8%e7%94%b5%e8%b7%af%e5%9b%be%e8%a7%a3","status":"publish","type":"post","link":"http:\/\/www.szryc.com\/?p=17240","title":{"rendered":"MP2307DN \u5e94\u7528\u7535\u8def\u56fe\u89e3"},"content":{"rendered":"

MPS 3A \/ 23V \/ 340kHz \u540c\u6b65\u6574\u6d41\u964d\u538b\u8f6c\u6362\u5668 \u00b7 8 \u5f15\u811a SOIC-8\uff08\u5e26\u88f8\u9732\u710a\u76d8\uff09\u3002\u672c\u6587\u7528\u56db\u5f20\u56fe\u8bb2\u6e05\u695a\uff1a\u5f15\u811a\u600e\u4e48\u63a5\u3001\u5916\u56f4\u600e\u4e48\u914d\u3001\u5f00\u5173\u600e\u4e48\u5de5\u4f5c\u3001\u4e0a\u7535\u600e\u4e48\u8d77\u6765\uff0c\u5e76\u9644\u5143\u4ef6\u6e05\u5355\u3001\u8bbe\u8ba1\u516c\u5f0f\u4e0e\u5e03\u5c40\u8981\u70b9\u3002<\/p>\n

VIN 4.75\u201323 V<\/span>VOUT 0.925\u201320 V<\/span>IOUT 3 A\uff08\u5cf0\u503c 4 A\uff09<\/span>fSW<\/sub> 340 kHz \u56fa\u5b9a<\/span>\u6548\u7387\u6700\u9ad8 95%<\/span><\/div>\n
\n

1<\/span>\u5f15\u811a\u5b9a\u4e49\uff08\u9876\u89c6\u56fe\uff09<\/h2>\n

8 \u4e2a\u529f\u80fd\u811a + \u5e95\u90e8\u88f8\u9732\u710a\u76d8\uff08EP\uff09\u3002EP \u5fc5\u987b\u710a\u5230\u5927\u9762\u79ef GND \u94dc\u7b94\uff0c\u65e2\u662f\u5730\u56de\u8def\u4e5f\u662f\u4e3b\u8981\u6563\u70ed\u901a\u9053\u3002<\/p>\n

\"\"<\/div>\n

2<\/span>\u5178\u578b\u5e94\u7528\u7535\u8def\uff0812 V \u2192 3.3 V \/ 3 A\uff09<\/h2>\n

\u8fd9\u662f\u6570\u636e\u624b\u518c\u5b98\u65b9\u8bc4\u4f30\u677f EV2307DN-00A \u7684\u7535\u8def\uff0c\u4e5f\u662f\u7edd\u5927\u591a\u6570\u5b9e\u9645\u4ea7\u54c1\u7684\u539f\u578b\uff1a\u5355\u7535\u611f\u3001\u5168\u9676\u74f7\u7535\u5bb9\u3001\u65e0\u9700\u5916\u90e8\u4e8c\u6781\u7ba1\u5373\u53ef\u5de5\u4f5c\u3002\u56fe\u4e2d\u6570\u5b57\u6807\u8bb0\u5bf9\u5e94\u4e0b\u65b9\u8981\u70b9\u8bf4\u660e\u3002<\/p>\n

\"\"<\/div>\n\n\n\n\n\n\n\n\n\n\n\n
\u7f16\u53f7<\/th>\n\u4f4d\u7f6e<\/th>\n\u4e3a\u4ec0\u4e48\u8fd9\u6837\u63a5 \/ \u8bbe\u8ba1\u8981\u70b9<\/th>\n<\/tr>\n<\/thead>\n
\u2460<\/b><\/td>\n\u8f93\u5165\u65c1\u8def C1\uff082\u00d710 \u00b5F\uff09<\/td>\nBuck \u7684\u8f93\u5165\u7535\u6d41\u662f\u8109\u51b2\u7684\uff0cC1 \u63d0\u4f9b\u5f00\u5173\u77ac\u95f4\u7684 AC \u7535\u6d41\u3002\u5fc5\u987b\u7d27\u8d34 IN \u811a\u4e0e GND \u811a<\/b>\u653e\u7f6e\uff0c\u56de\u8def\u9762\u79ef\u8d8a\u5c0f\u8d8a\u597d\uff1b\u5efa\u8bae\u518d\u5e76 1 \u9897 0.1 \u00b5F \u9ad8\u9891\u9676\u74f7\u3002RMS \u7535\u6d41\u989d\u5b9a\u503c\u5e94 \u2265 \u8d1f\u8f7d\u7535\u6d41\u7684\u4e00\u534a\u3002<\/td>\n<\/tr>\n
\u2461<\/b><\/td>\n\u81ea\u4e3e\u7535\u5bb9 C5\uff0810 nF\uff09<\/td>\n\u63a5\u5728 BS \u4e0e SW \u4e4b\u95f4\uff0c\u4e3a\u5185\u90e8\u9ad8\u4fa7 N-MOS \u63d0\u4f9b\u6d6e\u5730\u6805\u9a71\u52a8\u7535\u538b\uff08\u7ea6 5 V\uff09\u3002\u7f3a\u8fd9\u9897\u7535\u5bb9\u82af\u7247\u5b8c\u5168\u4e0d\u51fa\u5f00\u5173\u6ce2\u5f62<\/b>\uff0c\u662f\u6700\u5e38\u89c1\u7684\"\u6ca1\u8f93\u51fa\"\u539f\u56e0\u3002<\/td>\n<\/tr>\n
\u2462<\/b><\/td>\n\u7535\u611f L1\uff0810 \u00b5H \/ 4 A\uff09<\/td>\n\u51b3\u5b9a\u7eb9\u6ce2\u7535\u6d41\u4e0e\u7eb9\u6ce2\u7535\u538b\u3002\u9971\u548c\u7535\u6d41\u5fc5\u987b\u5927\u4e8e\u5cf0\u503c\u7535\u611f\u7535\u6d41\uff083 A \u8d1f\u8f7d\u65f6\u7ea6 3.6 A\uff09\uff0c\u4e14\u4f18\u4e8e 5.8 A \u7684\u5f00\u5173\u9650\u6d41\u70b9\uff1bDCR \u8d8a\u4f4e\u6548\u7387\u8d8a\u9ad8\u3002<\/td>\n<\/tr>\n
\u2463<\/b><\/td>\n\u53cd\u9988\u5206\u538b R1 \/ R2<\/td>\nVOUT<\/sub> = 0.925 \u00d7 (1 + R1\/R2)\u3002R2 \u53d6 10 k\u03a9 \u4e3a\u6807\u51c6\u503c\uff0cR1 = 10.81 \u00d7 (VOUT<\/sub> \u2212 0.925) k\u03a9\u3002\u8d70\u7ebf\u8981\u77ed\u3001\u8fdc\u79bb SW\uff0c\u5426\u5219\u8f93\u51fa\u6296\u52a8\u3002<\/td>\n<\/tr>\n
\u2464<\/b><\/td>\n\u8865\u507f\u7f51\u7edc R3 + C3<\/td>\nCOMP \u662f\u5185\u90e8\u8de8\u5bfc\u8bef\u5dee\u653e\u5927\u5668\u8f93\u51fa\uff0cR3 \u4e0e C3 \u4e32\u8054\u5230 GND<\/b> \u4ea7\u751f\u4e00\u4e2a\u96f6\u70b9\uff0c\u4fdd\u8bc1\u76f8\u4f4d\u88d5\u5ea6\u3002C3 \u592a\u5927\u54cd\u5e94\u6162\u3001\u592a\u5c0f\u6613\u632f\u8361\uff1b\u8f93\u51fa\u7535\u5bb9\u6539\u7528\u5927\u5bb9\u91cf\u7535\u89e3\u65f6\u8fd8\u8981\u5e76 C6\u3002<\/td>\n<\/tr>\n
\u2465<\/b><\/td>\n\u8f6f\u542f\u52a8\u7535\u5bb9 C4\uff080.1 \u00b5F\uff09<\/td>\nSS \u811a\u7528 6 \u00b5A \u6052\u6d41\u5145\u7535\uff0c0.1 \u00b5F \u5bf9\u5e94\u7ea6 15 ms \u542f\u52a8\u65f6\u95f4\uff0c\u6291\u5236\u4e0a\u7535\u6d6a\u6d8c\u3002\u60ac\u7a7a\u5219\u5173\u95ed\u8f6f\u542f\u52a8\u529f\u80fd\u3002<\/td>\n<\/tr>\n
\u2466<\/b><\/td>\n\u4f7f\u80fd\u4e0a\u62c9 R4\uff08100 k\u03a9\uff09<\/td>\nEN \u662f\u6570\u5b57\u8f93\u5165\uff0c\u9ad8\u7535\u5e73\u5f00\u542f\uff08\u9608\u503c\u7ea6 1.5 V\uff09\u3002\u63a5 VIN \u5b9e\u73b0\u81ea\u52a8\u542f\u52a8\uff1b\u63a5 MCU GPIO \u53ef\u505a\u5f00\u5173\u63a7\u5236\uff0c\u6b64\u65f6 R4 \u53ef\u4fdd\u7559\u505a\u9ed8\u8ba4\u4e0a\u7535\u3002<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u53ef\u9009\u589e\u5f3a\uff1a<\/b>\u2460 \u5728 SW\u2013GND \u4e4b\u95f4\u5e76\u4e00\u9897\u8096\u7279\u57fa\uff08B130 \/ SK13\uff0c30 V 1 A\uff09\uff0c\u53ef\u63d0\u5347\u4f4e\u5360\u7a7a\u6bd4\u4e0b\u7684\u6548\u7387\uff1b\u2461 \u5f53 VOUT<\/sub> \u4e3a 5 V\/3.3 V \u4e14\u5360\u7a7a\u6bd4 > 65% \u65f6\uff0c\u4ece VOUT<\/sub> \u5230 BS \u52a0\u4e00\u9897 1N4148\uff0c\u53ef\u8ba9\u81ea\u4e3e\u7535\u5bb9\u5145\u5f97\u66f4\u6ee1\uff0c\u6548\u7387\u518d\u63d0\u5347 1\u20132 \u4e2a\u767e\u5206\u70b9\uff08\u6b64\u65f6\u81ea\u4e3e\u7535\u5bb9\u53ef\u53d6 0.1\u20131 \u00b5F\uff09\u3002<\/p>\n

3<\/span>\u5b83\u600e\u4e48\u5de5\u4f5c\uff1a\u4e24\u4e2a\u5f00\u5173\u72b6\u6001<\/h2>\n

MP2307 \u5185\u90e8\u96c6\u6210\u4e86\u4e0a\u7ba1 Q1 \u4e0e\u4e0b\u7ba1 Q2\uff08\u5404\u7ea6 100 m\u03a9\uff09\uff0c\u7528 PWM \u63a7\u5236 Q1 \u7684\u5bfc\u901a\u5360\u7a7a\u6bd4 D \u2248 VOUT<\/sub>\/VIN<\/sub>\uff0c\u7535\u611f\u4e0e\u8f93\u51fa\u7535\u5bb9\u628a\u65b9\u6ce2\u6ee4\u6210\u76f4\u6d41\u3002<\/p>\n

\"\"<\/div>\n

\u7531\u4e8e\u4e0b\u7ba1\u662f MOSFET \u800c\u4e0d\u662f\u8096\u7279\u57fa\u4e8c\u6781\u7ba1\uff0c\u7eed\u6d41\u538b\u964d\u53ea\u6709 I\u00d7RDS(on)<\/sub>\uff083 A \u65f6\u7ea6 0.3 V\uff09\uff0c\u8fd9\u6b63\u662f\u5b83\u80fd\u505a\u5230 95% \u6548\u7387\u7684\u539f\u56e0\u3002\u4e24\u4e2a\u72b6\u6001\u4ea4\u66ff\uff0c\u5360\u7a7a\u6bd4\u7531\u53cd\u9988\u73af\u8def\u81ea\u52a8\u8c03\u8282\uff1a\u8f93\u51fa\u8dcc\u843d\u5c31\u52a0\u5bbd Q1 \u5bfc\u901a\u65f6\u95f4\uff0c\u8f93\u51fa\u504f\u9ad8\u5c31\u7f29\u7a84\u3002<\/p>\n

4<\/span>\u4e0a\u7535\u65f6\u5e8f\uff1aEN\u3001\u8f6f\u542f\u52a8\u4e0e\u8f93\u51fa\u5efa\u7acb<\/h2>\n

C4 = 0.1 \u00b5F \u65f6\u8f6f\u542f\u52a8\u7ea6 15 ms\uff08SS \u811a\u5185\u90e8 6 \u00b5A \u6052\u6d41\u5145\u7535\u5230 0.925 V \u9644\u8fd1\uff09\u3002\u8fd9\u6bb5\u659c\u5761\u628a\u8f93\u5165\u6d6a\u6d8c\u7535\u6d41\u538b\u4e0b\u6765\uff0c\u907f\u514d 12 V \u9002\u914d\u5668\u88ab\"\u62c9\u6b7b\"\u3002<\/p>\n

\"\"<\/div>\n

\u6ce8\u610f EN \u7531\u5185\u90e8 1.5 V\/2.5 V \u6bd4\u8f83\u5668\u4e0e\u9501\u5b58\u903b\u8f91\u7ba1\u7406\uff0c\u5e76\u6709 7 V \u9f50\u7eb3\u94b3\u4f4d\u4fdd\u62a4\uff0c\u6240\u4ee5 EN \u53ef\u4ee5\u76f4\u63a5\u63a5 VIN\uff08\u7ecf 100 k\u03a9\uff09\u6216\u63a5 3.3 V\/5 V \u903b\u8f91\u3002\u82e5 EN \u60ac\u7a7a\u6216\u9a71\u52a8\u80fd\u529b\u4e0d\u8db3\uff0c\u82af\u7247\u4e0d\u4f1a\u542f\u52a8\u2014\u2014\u8fd9\u662f\"\u710a\u63a5\u6ca1\u95ee\u9898\u4f46\u6ca1\u8f93\u51fa\"\u7684\u7b2c\u4e8c\u5927\u539f\u56e0\u3002<\/p>\n

5<\/span>\u5143\u4ef6\u6e05\u5355\u4e0e\u53c2\u6570\u8ba1\u7b97<\/h2>\n

3.3 V \/ 3 A \u914d\u7f6e BOM<\/h3>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\u4f4d\u53f7<\/th>\n\u89c4\u683c<\/th>\n\u4f5c\u7528\u4e0e\u9009\u578b\u63d0\u9192<\/th>\n<\/tr>\n<\/thead>\n
C1<\/td>\n2 \u00d7 10 \u00b5F \/ 25 V\uff0cX5R\/X7R \u9676\u74f7<\/td>\n\u8f93\u5165\u65c1\u8def\uff0c\u7d27\u8d34 IN \u4e0e GND\uff1bRMS \u7535\u6d41 \u2265 1.5 A\uff0c\u53ef\u518d\u52a0 0.1 \u00b5F<\/td>\n<\/tr>\n
C2<\/td>\n2 \u00d7 22 \u00b5F \/ 6.3 V\uff0cX5R \u9676\u74f7<\/td>\n\u8f93\u51fa\u6ee4\u6ce2\uff0c\u4f4e ESR\uff1b\u82af\u7247\u5bf9\u9676\u74f7\u7535\u5bb9\u7a33\u5b9a\uff0c\u65e0\u9700\u989d\u5916 ESR \u7535\u963b<\/td>\n<\/tr>\n
C3<\/td>\n3.9 nF \u9676\u74f7<\/td>\n\u4e0e R3 \u4e32\u8054\u6784\u6210\u8865\u507f\u96f6\u70b9\uff0c\u9760\u8fd1 COMP \u811a<\/td>\n<\/tr>\n
C4<\/td>\n0.1 \u00b5F \u9676\u74f7<\/td>\n\u8f6f\u542f\u52a8\u7535\u5bb9\uff0c\u5bf9\u5e94 \u224815 ms<\/td>\n<\/tr>\n
C5<\/td>\n10 nF \u9676\u74f7<\/td>\n\u81ea\u4e3e\u7535\u5bb9\uff0c\u8de8\u63a5 BS\u2013SW\uff0c\u8010\u538b \u2265 16 V<\/td>\n<\/tr>\n
C6<\/td>\n\uff08\u53ef\u9009\uff09\u6309\u516c\u5f0f\u8ba1\u7b97<\/td>\n\u8f93\u51fa\u7528\u5927\u5bb9\u91cf\u7535\u89e3\/\u94bd\u7535\u5bb9\u65f6\u624d\u9700\u8981\uff0c\u4e0e R3 \u5e76\u8054\u6784\u6210\u9ad8\u9891\u6781\u70b9<\/td>\n<\/tr>\n
R1<\/td>\n26.1 k\u03a9\uff0c1%<\/td>\n\u53cd\u9988\u4e0a\u504f\u7f6e\uff08\u5bf9\u5e94 3.3 V\uff09<\/td>\n<\/tr>\n
R2<\/td>\n10 k\u03a9\uff0c1%<\/td>\n\u53cd\u9988\u4e0b\u504f\u7f6e\uff08\u6807\u51c6\u503c\uff0c\u6700\u9ad8\u53ef\u7528 100 k\u03a9\uff09<\/td>\n<\/tr>\n
R3<\/td>\n6.8 k\u03a9\uff0c1%<\/td>\n\u8865\u507f\u7535\u963b\uff0c\u8bbe\u5b9a\u73af\u8def\u4ea4\u8d8a\u9891\u7387<\/td>\n<\/tr>\n
R4<\/td>\n100 k\u03a9<\/td>\nEN \u4e0a\u62c9\u5230 VIN\uff0c\u5b9e\u73b0\u81ea\u52a8\u542f\u52a8<\/td>\n<\/tr>\n
L1<\/td>\n10 \u00b5H\uff0cIsat<\/sub> \u2265 4 A\uff0cDCR \u4f4e<\/td>\n\u5c4f\u853d\u5f0f\u529f\u7387\u7535\u611f\uff1b\u9971\u548c\u7535\u6d41\u987b\u9ad8\u4e8e\u5cf0\u503c\u7535\u6d41\uff08\u7ea6 3.6 A\uff09<\/td>\n<\/tr>\n
D1<\/td>\n\uff08\u53ef\u9009\uff09B130 \/ SK13\uff0c30 V 1 A<\/td>\nSW\u2013GND \u5e76\u8054\u8096\u7279\u57fa\uff0c\u6539\u5584\u6548\u7387\uff1b\u6216 1N4148 \u4ece VOUT \u5230 BS \u589e\u5f3a\u81ea\u4e3e<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u5e38\u7528\u8f93\u51fa\u7535\u538b\u5bf9\u5e94\u7684\u5206\u538b\u7535\u963b<\/h3>\n\n\n\n\n\n\n\n\n\n
VOUT<\/sub><\/th>\nR1\uff081%\uff09<\/th>\nR2<\/th>\n\u5b9e\u9645\u8f93\u51fa<\/th>\n\u5178\u578b\u7528\u9014<\/th>\n<\/tr>\n<\/thead>\n
1.8 V<\/td>\n9.53 k\u03a9<\/td>\n10 k\u03a9<\/td>\n1.806 V<\/td>\nDDR \/ FPGA \u5185\u6838 \/ MCU \u4f4e\u529f\u8017\u57df<\/td>\n<\/tr>\n
2.5 V<\/td>\n16.9 k\u03a9<\/td>\n10 k\u03a9<\/td>\n2.488 V<\/td>\n\u63a5\u53e3\u7535\u5e73\u3001\u4f20\u611f\u5668\u4f9b\u7535<\/td>\n<\/tr>\n
3.3 V<\/td>\n26.1 k\u03a9<\/td>\n10 k\u03a9<\/td>\n3.339 V<\/td>\nMCU \/ \u6811\u8393\u6d3e \/ \u903b\u8f91\u4e3b\u7535\u6e90<\/td>\n<\/tr>\n
5.0 V<\/td>\n44.2 k\u03a9<\/td>\n10 k\u03a9<\/td>\n5.014 V<\/td>\nUSB \u4f9b\u7535\u3001\u7ee7\u7535\u5668\u3001\u98ce\u6247<\/td>\n<\/tr>\n
12 V<\/td>\n121 k\u03a9<\/td>\n10 k\u03a9<\/td>\n12.12 V<\/td>\n12 V \u4e2d\u95f4\u6bcd\u7ebf\uff08\u9700 VIN<\/sub> > 13.5 V\uff09<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u6838\u5fc3\u516c\u5f0f<\/h3>\n
VOUT<\/sub> = 0.925 \u00d7 (1 + R1 \/ R2)\u3000\u3000\u2192\u3000\u3000R1 = 10.81 \u00d7 (VOUT<\/sub> \u2212 0.925) k\u03a9\uff08R2 = 10 k\u03a9\uff09
\nL = VOUT<\/sub><\/em> \/ (fS<\/sub> \u00b7 \u0394IL<\/sub>) \u00d7 (1 \u2212 VOUT<\/sub>\/VIN<\/sub>)\u3000\uff0c\u0394IL<\/sub> \u53d6\u5f00\u5173\u9650\u6d41\u7684 30%\uff08\u7ea6 1.7 A\uff09
\nILP<\/sub> = ILOAD<\/sub> + VOUT<\/sub>\/(2\u00b7fS<\/sub>\u00b7L) \u00d7 (1 \u2212 VOUT<\/sub>\/VIN<\/sub>)\u3000\u2192\u3000\u7535\u611f\u9971\u548c\u7535\u6d41\u5fc5\u987b > \u6b64\u503c
\n\u0394VOUT<\/sub> \u2248 VOUT<\/sub> \/ (8 \u00b7 fS<\/sub>\u00b2 \u00b7 L \u00b7 C2) \u00d7 (1 \u2212 VOUT<\/sub>\/VIN<\/sub>)\u3000\uff08\u9676\u74f7\u7535\u5bb9\uff09<\/div>\n
\n
\n
3.3V \u65f6\u5360\u7a7a\u6bd4<\/div>\n
\u2248 27.5%<\/div>\n<\/div>\n
\n
\u7535\u611f\u7eb9\u6ce2 \u0394IL<\/sub>\uff0812V \u8f93\u5165\uff09<\/div>\n
\u2248 0.87 A<\/div>\n<\/div>\n
\n
\u5cf0\u503c\u7535\u611f\u7535\u6d41 @3A<\/div>\n
\u2248 3.44 A<\/div>\n<\/div>\n
\n
\u8f93\u51fa\u7eb9\u6ce2\uff0844 \u00b5F\uff09<\/div>\n
\u2248 8 mV<\/div>\n<\/div>\n<\/div>\n

\u4ee5\u4e0a\u6309 fS<\/sub>=340 kHz\u3001L=10 \u00b5H\u3001C2=44 \u00b5F \u8ba1\u7b97\uff0c\u4f9b\u5feb\u901f\u6838\u7b97\uff0c\u5b9e\u9645\u4ee5\u5b9e\u6d4b\u4e3a\u51c6\u3002<\/p>\n

6<\/span>Layout \u5e03\u5c40\u8981\u70b9\uff08\u51b3\u5b9a\u6210\u8d25\uff09<\/h2>\n
\n
\n

\u5fc5\u987b\u505a\u5230\u7684 5 \u6761<\/h3>\n
    \n
  • \u8f93\u5165\u56de\u8def\u6700\u5c0f<\/b>\uff1aC1 \u2192 IN \u2192 \u82af\u7247\u5185\u90e8\u4e0a\u7ba1 \u2192 GND \u2192 C1 \u56f4\u6210\u7684\u73af\u8def\u9762\u79ef\u8d8a\u5c0f\u8d8a\u597d\uff08\u8fd9\u662f\u552f\u4e00\u7684 di\/dt \u5927\u7535\u6d41\u56de\u8def\uff09\u3002<\/li>\n
  • \u65c1\u8def\u7535\u5bb9\u8d34\u811a<\/b>\uff1a0.1 \u00b5F \u9ad8\u9891\u9676\u74f7\u7d27\u9760 IN \u5f15\u811a\uff0c\u5148\u8fc7\u7535\u5bb9\u518d\u8fdb\u82af\u7247\u3002<\/li>\n
  • FB \u77ed\u800c\u76f4<\/b>\uff1aR1\/R2 \u4e0e COMP \u5143\u4ef6\u5c3d\u91cf\u9760\u8fd1\u82af\u7247\uff0cFB \u8d70\u7ebf\u8fdc\u79bb SW \u8282\u70b9\uff0c\u7edd\u4e0d\u4ece\u7535\u611f\u4e0b\u65b9\u7a7f\u8fc7\u3002<\/li>\n
  • SW \u94dc\u7b94\u5c0f\u800c\u77ed<\/b>\uff1aSW \u662f dv\/dt \u6700\u5927\u7684\u8282\u70b9\uff0c\u9762\u79ef\u5927 = \u8f90\u5c04\u5927\uff1b\u53ea\u505a\u5230\u6ee1\u8db3\u8f7d\u6d41\u5373\u53ef\u3002<\/li>\n
  • GND \u4e0e EP \u5927\u9762\u79ef\u94fa\u94dc<\/b>\uff1aEP \u6253 9 \u4e2a\u4ee5\u4e0a\u8fc7\u5b54\u5230\u5185\u5c42\/\u5e95\u5c42\u5730\u5e73\u9762\uff0c\u517c\u987e\u6563\u70ed\u4e0e\u56de\u6d41\u3002<\/li>\n<\/ul>\n<\/div>\n
    \n

    \u6563\u70ed\u6821\u6838<\/h3>\n

    \u03b8JA<\/sub> \u2248 50 \u00b0C\/W\uff081 \u5e73\u65b9\u82f1\u5bf8 1 oz \u94dc\uff09\uff0c\u03b8JC<\/sub> \u2248 10 \u00b0C\/W\u300212 V\u21923.3 V\/3 A\u3001\u6548\u7387 88% \u65f6\u635f\u8017\u7ea6 1.35 W\uff0c\u6e29\u5347 \u2248 68 \u00b0C\uff0c\u73af\u5883 25 \u00b0C \u65f6\u7ed3\u6e29\u5df2\u63a5\u8fd1 95 \u00b0C\u3002<\/p>\n

    \u7ed3\u8bba\uff1a<\/b>\u6ee1\u8f7d 3 A \u4e14 VIN<\/sub> \u2265 12 V \u65f6\uff0c\u52a1\u5fc5\u94fa\u94dc + \u6253\u8fc7\u5b54\uff1b\u82e5\u5916\u58f3\u5bc6\u95ed\u6216\u73af\u5883\u6e29\u5ea6 > 50 \u00b0C\uff0c\u5efa\u8bae\u628a\u8d1f\u8f7d\u964d\u5230 2 A \u4ee5\u5185\uff0c\u6216\u6539\u7528\u6548\u7387\u66f4\u9ad8\u7684\u540c\u6b65\u65b9\u6848\u3002<\/div>\n
    \n

    7<\/span>\u5e38\u89c1\u95ee\u9898\u901f\u67e5<\/h2>\n\n\n\n\n\n\n\n\n\n\n
    \u73b0\u8c61<\/th>\n\u6700\u53ef\u80fd\u539f\u56e0<\/th>\n\u5bf9\u7b56<\/th>\n<\/tr>\n<\/thead>\n
    \u4e0a\u7535\u65e0\u8f93\u51fa\uff0cSW \u65e0\u6ce2\u5f62<\/td>\nC5\uff08\u81ea\u4e3e\u7535\u5bb9\uff09\u6f0f\u8d34 \/ \u865a\u710a\uff1bEN \u672a\u62c9\u9ad8<\/td>\n\u8865 10 nF \u5230 BS\u2013SW\uff1b\u786e\u8ba4 EN > 1.5 V\uff0c\u6216\u52a0 100 k\u03a9 \u4e0a\u62c9<\/td>\n<\/tr>\n
    \u8f93\u51fa\u53ea\u6709 0.9 V \u5de6\u53f3\u4e14\u4e0d\u5347<\/td>\nFB \u5206\u538b\u865a\u710a\u3001R1 \u5f00\u8def\uff0c\u82af\u7247\u5de5\u4f5c\u5728\u6700\u5c0f\u5360\u7a7a\u6bd4<\/td>\n\u68c0\u67e5 R1\/R2 \u710a\u63a5\u4e0e\u963b\u503c\uff0cFB \u7535\u538b\u5e94 \u2248 0.925 V<\/td>\n<\/tr>\n
    \u8f7b\u8f7d\u6216\u7a7a\u8f7d\u65f6\u8f93\u51fa\u6296\u52a8\u3001\u6709\u97f3\u9891\u566a\u58f0<\/td>\n\u5de5\u4f5c\u4e8e\u8df3\u5468\u671f\u6a21\u5f0f\u3001\u7535\u611f\u6216\u9676\u74f7\u7535\u5bb9\u5578\u53eb<\/td>\n\u5c5e\u6b63\u5e38\u73b0\u8c61\uff1b\u52a0 1\u20135 mA \u9884\u8d1f\u8f7d\uff0c\u6216\u6362\u7528\u4e00\u4f53\u6210\u578b\u7535\u611f<\/td>\n<\/tr>\n
    \u6ee1\u8f7d\u65f6\u8f93\u51fa\u8dcc\u843d\u3001\u82af\u7247\u53d1\u70eb<\/td>\n\u7535\u611f\u9971\u548c\u7535\u6d41\u4e0d\u8db3\u3001\u6563\u70ed\u4e0d\u591f\u3001\u8f93\u5165\u8d70\u7ebf\u592a\u7ec6<\/td>\n\u6362 Isat<\/sub> > 5 A \u7535\u611f\uff1b\u52a0\u5927\u94fa\u94dc\u4e0e\u8fc7\u5b54\uff1b\u52a0\u5bbd IN\/GND \u8d70\u7ebf<\/td>\n<\/tr>\n
    \u8f93\u51fa\u7eb9\u6ce2\u7279\u522b\u5927\uff08>100 mV\uff09<\/td>\n\u8f93\u51fa\u7535\u5bb9\u5bb9\u91cf\u4e0d\u8db3\u6216 ESR \u9ad8\uff1b\u6d4b\u91cf\u65b9\u6cd5\u4e0d\u5f53<\/td>\n\u52a0\u5230 2\u00d722 \u00b5F \u9676\u74f7\uff1b\u7528\u5f39\u7c27\u5730\u73af\u6d4b\u91cf\uff0c\u52ff\u7528\u957f\u5730\u7ebf\u9cc4\u9c7c\u5939<\/td>\n<\/tr>\n
    \u8f93\u5165\u7535\u538b\u4e00\u4e0a\u7535\u5c31\u635f\u574f<\/td>\nVIN<\/sub> \u8d85\u8fc7 23 V \u4e0a\u9650\uff08\u5982\u76f4\u63a5\u63a5 24 V \u84c4\u7535\u6c60\/\u5de5\u4e1a\u6bcd\u7ebf\uff09<\/td>\n24 V \u7cfb\u7edf\u5fc5\u987b\u964d\u989d\u6216\u6539\u7528\u8010\u538b \u2265 28 V \u7684\u578b\u53f7<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
    \u91cd\u8981\u63d0\u793a\uff1a<\/b>24 V \u5de5\u4e1a\u6bcd\u7ebf \/ 24 V \u84c4\u7535\u6c60\u6ee1\u7535\uff08\u53ef\u8fbe 27\u201329 V\uff09\u4e0d\u80fd<\/b>\u76f4\u63a5\u63a5 MP2307\uff08\u63a8\u8350\u4e0a\u9650 23 V\u3001\u7edd\u5bf9\u6700\u5927 26 V\uff09\u3002\u8fd9\u7c7b\u573a\u5408\u8bf7\u9009 MP2338\u3001MP4560 \u7b49\u66f4\u9ad8\u8010\u538b\u5668\u4ef6\uff1b\u65b0\u8bbe\u8ba1\u4e5f\u4e0d\u5efa\u8bae\u518d\u7528 MP2307\u2014\u2014MPS \u5df2\u5c06\u5176\u6807\u8bb0\u4e3a NRND\uff08\u4e0d\u63a8\u8350\u65b0\u8bbe\u8ba1\uff09<\/b>\uff0c\u540c\u5c01\u88c5\/\u540c\u529f\u80fd\u7684\u66ff\u4ee3\u53ef\u9009 MP2315\uff0824 V\/3 A\uff0c1 MHz\uff0c\u5916\u56f4\u66f4\u5c0f\uff09\u3002<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

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