uc3842开关电源的限流电阻怎么计算 uc3842过流电阻怎么算
uc3842\u5f00\u5173\u7535\u6e90\u7684\u4e3b\u7535\u8def\u5404\u4e2a\u7535\u963b\u7535\u5bb9\u7684\u8ba1\u7b97\uff0c\u6211\u628a\u7535\u8def\u8bbe\u8ba1\u597d\u4e86\uff0c\u4e0d\u77e5\u9053\u600e\u4e48\u8ba1\u7b97\u6bcf\u4e00\u4e2a\u5143\u5668\u4ef6\u7535\u5bb9\uff0c\u90a3\u4e9b\u4e0d\u90fd\u662f\u7b97\u7684\uff0c\u5728UC3842\u5e94\u7528\u624b\u518c\u4e0a\uff0c\u5e94\u8be5\u6709\u5176\u5916\u56f4\u5143\u4ef6\u5404\u503c\uff0c\u548c\u5176\u5178\u578b\u5e94\u7528\uff0c15\u523035V\u4e5f\u4f1a\u6709\u8c03\u6574\u54ea\u91cc\u4f1a\u6709\u7535\u538b\u53d8\u5316\u8303\u56f4\u503c\u3002\u592a\u5e94\u8bd5\u6559\u80b2\u4e86\uff0c\u8001\u5e08\u8c01\u5440\u5931\u804c
\u4e09\u811a\u7535\u538b\u8d85\u8fc71V\u68c0\u6d4b\u4e3a\u8fc7\u6d41 \u75281/I=R I\u4e3a\u8981\u9650\u5236\u7684\u6700\u5927\u7535\u6d41
\u2460\u811a\u662f\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
\u2461\u811a\u662f\u53cd\u9988\u7535\u538b\u8f93\u5165\u7aef\uff0c\u6b64\u811a\u7535\u538b\u4e0e\u8bef\u5dee\u653e\u5927\u5668\u540c\u76f8\u7aef\u7684 2.5V \u57fa\u51c6\u7535\u538b\u8fdb\u884c\u6bd4\u8f83\uff0c\u4ea7\u751f\u8bef\u5dee\u7535\u538b\uff0c\u4ece\u800c\u63a7\u5236\u8109\u51b2\u5bbd\u5ea6\uff1b
\u2462\u811a\u4e3a\u7535\u6d41\u68c0\u6d4b\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
\u2463\u811a\u4e3a\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=1.8/(RT\u00d7CT)\uff1b
\u2464\u811a\u4e3a\u516c\u5171\u5730\u7aef\uff1b
\u2465\u811a\u4e3a\u63a8\u633d\u8f93\u51fa\u7aef\uff0c\u5185\u90e8\u4e3a\u56fe\u817e\u67f1\u5f0f\uff0c\u4e0a\u5347\u3001\u4e0b\u964d\u65f6\u95f4\u4ec5\u4e3a 50ns \u9a71\u52a8\u80fd\u529b\u4e3a\u00b11A \uff1b
\u2466\u811a\u662f\u76f4\u6d41\u7535\u6e90\u4f9b\u7535\u7aef\uff0c\u5177\u6709\u6b20\u3001\u8fc7\u538b\u9501\u5b9a\u529f\u80fd\uff0c\u82af\u7247\u529f\u8017 \u4e3a15mW\uff1b
\u2467\u811a\u4e3a5V \u57fa\u51c6\u7535\u538b\u8f93\u51fa\u7aef\uff0c\u670950mA \u7684\u8d1f\u8f7d\u80fd\u529b\u3002
一般一欧姆以下，有0.15的，0.33欧姆的，0.5欧姆的，2w左右，功率大一点选3w，希望能帮到你
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绛旓細褰撳紑鍏崇鍙UC3842B閮芥槸鐐歌鏃,鏈濂藉湪鏇存崲鎹熷潖鐨勫厓鍣ㄤ欢涔嬪悗,鍐嶆灙鏌勫紑鍏崇G鏋(鏍呮瀬)鎵鎺鐨勯檺娴佺數闃R609鏄惁鎹熷潖,鑻ヨ繖涓數闃荤儳姣佹垨鑰呴樆鍊煎澶х殑璇,灏变細寮曡捣寮鍏崇鐨勬縺鍔变笉瓒,浠庤屽嚭鐜版洿鎹㈡柊鐨鐢垫簮寮鍏绠″悗,绠″瓙浼氬彂鐑垨鑰呯粡甯哥儳姣佺殑鏁呴殰銆傚湪鏈変簺鏈哄瀷涓,鐢垫簮寮鍏崇鐨凣鏋佸鍦颁箣闂磋繕鏈変竴涓繚鎶ょ殑绋冲帇浜屾瀬绠,鏇存崲鐢垫簮...
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绛旓細1銆佸伐浣滃師鐞 鍥1涓瑿1銆乂1锝濾4銆丆2缁勬垚婊ゆ尝鏁存祦鐢佃矾,鍙樺帇鍣═涓洪珮棰戝彉鍘嬪櫒,V5銆丷2銆丆11缁勬垚鍔熺巼寮鍏绠7鐨勪繚鎶ょ數璺,NF涓轰緵缁橧C鐢垫簮鐨缁曠粍銆傚崟绔緭鍑篒C涓UC3842,鍏8鑴氳緭鍑5V鍩哄噯鐢靛帇,2鑴氫负鍙嶇浉杈撳叆,1鑴氫负鏀惧ぇ鍣ㄨ緭鍑,4鑴氫负鎸崱鐢靛C9銆鐢甸樆R7杈撳叆绔,5鑴氫负鎺ュ湴绔,3鑴氫负杩囨祦淇濇姢绔,6鑴氫负璋冨鍗曡剦鍐茶緭鍑虹,7鑴...
绛旓細uc3842鍜実鏋佸鎺鐨勯檺娴佺數闃蹇呭潖锛庢鏃剁洿鎺ユ洿鎹㈠嵆鍙傚潎涓巙c3843锛坘a3843锛夌浉宸敋杩滐紝鍥犳锛屽畠浠箣闂存槸涓嶈兘鐩存帴浠ｆ浛鐨勶紝杩欎竴鐐瑰湪缁翠慨宸ヤ綔涓繀椤昏娉ㄦ剰銆備竴鐐硅ˉ鍏:3842绯诲垪鍜3843绯诲垪鍦ㄥ惎鍔ㄧ數鍘嬪拰鍏抽棴鐢靛帇鏂归潰涔熷瓨鍦ㄧ潃杈冨ぇ鐨勫尯鍒.鍓嶈呯殑鍚姩鐢靛帇涓16v,鍏抽棴鐢靛帇涓10v;鍚庤呯殑鍚姩鐢靛帇涓8.5v锛屽叧闂數鍘嬩负7.6v...
绛旓細鍒鐢垫簮寮鍏绠℃崯鍧忔椂锛UC3842鍜孏鏋佸鎺鐨勯檺娴佺數闃蹇呭潖锛庢鏃剁洿鎺ユ洿鎹㈠嵆鍙紟闇瑕佹敞鎰忕殑鏄紝鐢垫簮寮鍏崇婧愭瀬锛圫鏋侊級閫氬父鎺1涓皬闃诲笺澶у姛鐜囩殑鐢甸樆浣滀负杩囨祦淇濇姢妫娴嬬數闃伙紟姝ょ數闃荤殑闃诲间竴鑸湪0.2-0.6銆涔嬮棿锛屽ぇ浜庢鍊间細鍑虹幇甯︿笉璧疯礋杞界殑鐜拌薄锛堝氨鏄鏋佺數鍘嬪亸浣庯級锛庣敱浜嶶C3842锛圞A3842锛夌殑宸ヤ綔鐢靛帇鍜岃緭鍑...
绛旓細璋冩暣 RP1(510 娆у崐鍙皟鐢典綅鍣)鍙互缁嗚皟鍏呯數鍣ㄧ殑鐢靛帇,LED1鏄鐢垫簮鎸囩ず鐏.鎺ラ氱數婧愬悗璇ユ寚绀虹伅灏变細鍙戝嚭绾㈣壊鐨勫厜銆俈T1寮濮嬪伐浣滃悗,鍙樺帇鍣ㄧ殑娆＄骇6-5缁曠粍杈撳嚭鐨勭數鍘嬬粡蹇熸仮澶嶄簩鏋佺VD60鏁存祦,C18婊ゆ尝寰楀埌绋冲畾鐨勭數鍘嬨傛鐢靛帇涓璺粡浜屾瀬绠D70缁欑數姹犲厖鐢,鍙︿竴璺粡闄愭祦鐢甸樆R38,绋冲帇浜屾瀬绠ZD1,婊ゆ尝鐢礐鍜5鑴氥傛...
