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UC3842 \u91c7\u7528\u56fa\u5b9a\u5de5\u4f5c\u9891\u7387\u8109\u51b2\u5bbd\u5ea6\u53ef\u63a7\u8c03\u5236\u65b9\u5f0f\uff0c\u5171\u67098 \u4e2a\u5f15\u811a\uff0c\u5404\u811a\u529f\u80fd\u5982\u4e0b\uff1a\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\u76842.5V \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\u4e3a50ns \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
若外接RC相同，3842/3/4/5的振荡频率是一样的，且3842/3的输出频率与振荡频率相同，而3844/5输出频率为振荡频率的一半。4脚处接的电阻，电容都一样，振荡频率也一样。
绛旓細鑻ュ鎺C鐩稿悓锛3842/3/4/5鐨勬尟鑽￠鐜囨槸涓鏍风殑锛屼笖3842/3鐨勮緭鍑洪鐜囦笌鎸崱棰戠巼鐩稿悓锛岃3844/5杈撳嚭棰戠巼涓烘尟鑽￠鐜囩殑涓鍗娿
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绛旓細UC3842鐢垫簮鑴氾紙7鑴氾級鐢靛帇寮鍚榾鍊16V锛屽叧闂榾鍊10V锛屾渶楂樼數鍘嬩笉寰楄秴杩34V銆俇C3842 閲囩敤鍥哄畾宸ヤ綔棰戠巼鑴夊啿瀹藉害鍙帶璋冨埗鏂瑰紡锛屽叡鏈8 涓紩鑴氾紝鍚勮剼鍔熻兘濡備笅锛1銆佽剼鏄宸斁澶у櫒鐨勮緭鍑虹锛屽鎺ラ樆瀹瑰厓浠剁敤浜庢敼鍠勮宸斁澶у櫒鐨勫鐩婂拰棰戠巼鐗规э紱2銆佽剼鏄弽棣堢數鍘嬭緭鍏ョ锛屾鑴氱數鍘嬩笌璇樊鏀惧ぇ鍣ㄥ悓鐩哥鐨2.5V 鍩哄噯...
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绛旓細TL494鏄數鍘嬮┍鍔鍨嬭剦瀹借皟鍒鍣紝涔熷氨鏄帶鍒惰緭鍑虹數鍘嬶紝鍔熺巼绠¤鏈夐┍鍔ㄧ數璺俇C3842 鏄鐢垫祦鎺у埗鍨嬭剦瀹借皟鍒惰姱鐗囷紝鍙互鐩存帴椹卞姩鍔熺巼绠
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绛旓細1锛氱敤鏁板瓧涓囩敤琛ㄤ簩鏋佺妗ｆ祴3842绗5鑴氬湴涓庡悇鑴氱殑闃诲煎簲鍩烘湰鏈変簩鏋佺鐨勭壒鎬э紝涓鑸敤娴嬪ソ鐨勪笌涔嬪姣斻2:鐢佃溅鍏呯數鍣ㄤ竴鑸敤3842.鎶婂畠鐒婁笅鏉ヨ鍥濱C搴с傛妸寰呮祴3842鎵︿笂鍘伙紝涓茶仈100W鐏场鍚庨氱數姝ｅ父灏辨槸濂界殑銆
绛旓細UC3842鏄敱Unitrode鍏徃寮鍙戠殑鏂板瀷鎺у埗鍣ㄤ欢,鏄浗鍐呭簲鐢ㄦ瘮杈冨箍娉涚殑涓绉嶇數娴佹帶鍒跺瀷鑴夊璋冨埗鍣ㄣ傛墍璋鐢垫祦鍨嬭剦瀹借皟鍒鍣ㄦ槸鎸夊弽棣堢數娴佹潵璋冭妭鑴夊鐨勩傚湪鑴夊姣旇緝鍣ㄧ殑杈撳叆绔洿鎺ョ敤娴佽繃杈撳嚭鐢垫劅绾垮湀鐢垫祦鐨勪俊鍙蜂笌璇樊鏀惧ぇ鍣ㄨ緭鍑轰俊鍙疯繘琛屾瘮杈,浠庤岃皟鑺傚崰绌烘瘮浣胯緭鍑虹殑鐢垫劅宄板肩數娴佽窡闅忚宸數鍘嬪彉鍖栬屽彉鍖栥傜敱浜庣粨鏋勪笂鏈夌數鍘嬬幆銆佺數娴佺幆鍙岀幆...
