时基电路555 555时基电路的工作原理
\u4ec0\u4e48\u662f555\u65f6\u57fa\u7535\u8def555\u65f6\u57fa\u7535\u8def\u53c8\u53eb555\u5b9a\u65f6\u5668\u3002555\u5b9a\u65f6\u5668\u662f\u4e00\u79cd\u6a21\u62df\u548c\u6570\u5b57\u529f\u80fd\u76f8\u7ed3\u5408\u7684\u4e2d\u89c4\u6a21\u96c6\u6210\u5668\u4ef6\u3002\u7528\u53cc\u6781\u578b(TTL)\u5de5\u827a\u5236\u4f5c\u7684\u79f0\u4e3a 555\uff0c\u7528 \u4e92\u8865\u91d1\u5c5e\u6c27\u5316\u7269(CMOS )\u5de5\u827a\u5236\u4f5c\u7684\u79f0\u4e3a 7555\u3002\u9664\u5355\u5b9a\u65f6\u5668\u5916\uff0c\u8fd8\u6709\u5bf9\u5e94\u7684\u53cc\u5b9a\u65f6\u5668 556/7556\u3002555 \u5b9a\u65f6\u5668\u7684\u7535\u6e90\u7535\u538b\u8303\u56f4\u5bbd\uff0c\u53ef\u5728 4.5V~16V \u5de5\u4f5c\uff0c7555 \u53ef\u5728 3~18V \u5de5\u4f5c\uff0c\u8f93\u51fa\u9a71\u52a8\u7535\u6d41\u7ea6\u4e3a 200mA\uff0c\u56e0\u800c\u5176\u8f93\u51fa\u53ef\u4e0e TTL\u3001CMOS \u6216\u8005\u6a21\u62df\u7535\u8def\u7535\u5e73\u517c\u5bb9\u3002
A1\u4e0eA2\u7684\u8f93\u51fa\u7aef\u63a7\u5236RS\u89e6\u53d1\u5668\u72b6\u6001\u548c\u653e\u7535\u7ba1\u5f00\u5173\u72b6\u6001\u3002\u5f53\u8f93\u5165\u4fe1\u53f7\u81ea6\u811a\uff0c\u5373\u9ad8\u7535\u5e73\u89e6\u53d1\u8f93\u5165\u5e76\u8d85\u8fc7\u53c2\u8003\u7535\u5e732/3VCC\u65f6\uff0c\u89e6\u53d1\u5668\u590d\u4f4d\uff0c555\u7684\u8f93\u51fa\u7aef3\u811a\u8f93\u51fa\u4f4e\u7535\u5e73\uff0c\u540c\u65f6\u653e\u7535\u5f00\u5173\u7ba1\u5bfc\u901a\uff1b\u5f53\u8f93\u5165\u4fe1\u53f7\u81ea2\u811a\u8f93\u5165\u5e76\u4f4e\u4e8e1/3VCC\u8fdb\uff0c\u89e6\u53d1\u5668\u590d\u4f4d\uff0c555\u76843\u811a\u8f93\u51fa\u9ad8\u7535\u5e73\uff0c\u540c\u65f6\u653e\u7535\u5f00\u5173\u7ba1\u622a\u6b62\u3002RD\u662f\u590d\u4f4d\u7aef\uff084\u811a\uff09\uff0c\u5f53RD=0,555\u8f93\u51fa\u4f4e\u7535\u5e73\u3002\u5e73\u65f6RD\u7aef\u5f00\u8def\u6216\u63a5VCC\u3002Vc\u662f\u63a7\u5236\u7535\u538b\u7aef\uff085\u811a\uff09\uff0c\u5e73\u65f6\u8f93\u51fa2/3VCC\u4f5c\u4e3a\u6bd4\u8f83\u5668A1\u7684\u53c2\u8003\u7535\u5e73\uff0c\u5f535\u811a\u5916\u63a5\u4e00\u4e2a\u8f93\u5165\u7535\u538b\uff0c\u5373\u6539\u53d8\u4e86\u6bd4\u8f83\u5668\u7684\u53c2\u8003\u7535\u5e73\uff0c\u4ece\u800c\u5b9e\u73b0\u5bf9\u8f93\u51fa\u7684\u53e6\u4e00\u79cd\u63a7\u5236\uff0c\u5728\u4e0d\u63a5\u5916\u52a0\u7535\u538b\u65f6\uff0c\u901a\u5e38\u63a5\u4e000.01uF\u7684\u7535\u5bb9\u5668\u5230\u5730\uff0c\u8d77\u6ee4\u6ce2\u4f5c\u7528\uff0c\u4ee5\u6d88\u9664\u5916\u6765\u7684\u5e72\u6270\uff0c\u4ee5\u786e\u4fdd\u53c2\u8003\u7535\u5e73\u7684\u7a33\u5b9a\u3002T\u4e3a\u653e\u7535\u7ba1\uff0c\u5f53T\u5bfc\u901a\u65f6\uff0c\u5c06\u7ed9\u63a5\u4e8e\u811a7\u7684\u7535\u5bb9\u5668\u63d0\u4f9b\u4f4e\u963b\u653e\u7535\u901a\u8def\u3002555\u5b9a\u65f6\u5668\u4e3b\u8981\u662f\u4e0e\u7535\u963b\u3001\u7535\u5bb9\u6784\u6210\u5145\u653e\u7535\u7535\u8def\uff0c\u5e76\u7531\u4e24\u4e2a\u6bd4\u8f83\u5668\u6765\u68c0\u6d4b\u7535\u5bb9\u5668\u4e0a\u7684\u7535\u538b\uff0c\u4ee5\u786e\u5b9a\u8f93\u51fa\u7535\u5e73\u7684\u9ad8\u4f4e\u548c\u653e\u7535\u5f00\u5173\u7ba1\u7684\u901a\u65ad\u3002\u8fd9\u5c31\u5f88\u65b9\u4fbf\u5730\u6784\u6210\u4ece\u5fae\u79d2\u5230\u6570\u5341\u5206\u949f\u7684\u5ef6\u65f6\u7535\u8def\uff0c\u53ef\u65b9\u4fbf\u5730\u6784\u6210\u5355\u7a33\u6001\u89e6\u53d1\u5668\uff0c\u591a\u8c10\u632f\u8361\u5668\uff0c\u65bd\u5bc6\u7279\u89e6\u53d1\u5668\u7b49\u8109\u51b2\u4ea7\u751f\u6216\u6ce2\u5f62\u53d8\u6362\u7535\u8def\u3002
这个电路是一个不实用的电路，那里写50mA是夸张说法，如果想稳定输出14.3V，3mA就差不多是极限了。还有就是，如果正负电压负载电阻不相等，正负电压可能不相等。所以还不如加一个DC-DC做负电压。
绛旓細555-VIRTUAL锛堝畾鏃跺櫒锛夊伐浣滃師鐞嗭細555闆嗘垚鏃跺熀鐢佃矾绉颁负闆嗘垚瀹氭椂鍣紝鏄竴绉嶆暟瀛椼佹ā鎷熸贩鍚堝瀷鐨勪腑瑙勬ā闆嗘垚鐢佃矾锛屽叾搴旂敤鍗佸垎骞挎硾銆傝鐢佃矾浣跨敤鐏垫椿銆佹柟渚匡紝鍙渶澶栨帴灏戦噺鐨勯樆瀹瑰厓浠跺氨鍙互鏋勬垚鍗曠ǔ銆佸璋愬拰鏂藉瘑鐗硅Е鍙戝櫒锛屽洜鑰屽箍娉涚敤浜庝俊鍙风殑浜х敓銆佸彉鎹佹帶鍒朵笌妫娴嬨傚畠鐨勫唴閮ㄧ數鍘嬫爣鍑嗕娇鐢ㄤ簡涓変釜5K鐨勭數闃伙紝鏁呭彇鍚55...
绛旓細妯℃嫙鐢佃矾銆傞噰鐢555鏃跺熀闆嗘垚鐢佃矾鍜屽緢灏戠殑澶栧洿鍏冧欢缁勬垚鐨勪竴涓俯搴﹁嚜鍔ㄦ帶鍒跺櫒銆傚洜涓虹數璺腑鍚勭偣鐢靛帇閮芥潵鑷悓涓鐩存祦鐢垫簮锛屾墍浠ヤ笉闇瑕佹ц兘寰堝ソ鐨勭ǔ鍘嬬數婧愶紝鐢ㄧ數瀹归檷鍘嬫硶渚胯兘鍙潬鍦板伐浣溿傜數璺厓浠朵环鏍间綆銆佷綋绉皬銆佷究浜庡湪涓氫綑鏉′欢涓嬭嚜鍒躲傝鐢佃矾鍒朵綔鐨勬俯搴﹁嚜鍔ㄦ帶鍒跺櫒鍙敤浜庡伐涓氱敓浜у拰瀹剁敤鐨勭數鍔犵儹鎺у埗锛屾晥鏋滆壇濂姐
绛旓細555鏃跺熀鐢佃矾鍘熺悊鏄埄鐢ㄤ袱涓瘮杈冨櫒鏉ユ娴嬭緭鍏ョ數鍘嬬殑楂樹綆锛岄氳繃RS瑙﹀彂鍣ㄦ潵鎺у埗鐢佃矾鐨勭姸鎬侊紝瀹炵幇瀹氭椂銆佸欢杩熴佹尟鑽＄瓑鍔熻兘銆555鏃跺熀鐢佃矾鍐呴儴鐨勪笁涓5k惟鐢甸樆缁勬垚浜嗗垎鍘嬬綉缁滐紝涓変釜鐢甸樆鍒嗗緱鐨2/3Vcc鍜1/3Vcc涓烘瘮杈冨櫒A1A2鎻愪緵鐢靛帇鍩哄噯銆備袱涓瘮杈冨櫒鐨勮緭鍑虹涓嶳S瑙﹀彂鍣ㄧ殑杈撳叆绔浉杩烇紝鎺у埗鍏剁疆浣嶇S鍜屽浣嶇R锛...
绛旓細555鏃跺熀鐢佃矾鍙堝彨555瀹氭椂鍣ㄣ555瀹氭椂鍣ㄦ槸涓绉嶆ā鎷熷拰鏁板瓧鍔熻兘鐩哥粨鍚堢殑涓妯￠泦鎴愬櫒浠躲傜敤鍙屾瀬鍨(TTL)宸ヨ壓鍒朵綔鐨勭О涓 555锛岀敤 浜掕ˉ閲戝睘姘у寲鐗(CMOS )宸ヨ壓鍒朵綔鐨勭О涓 7555銆傞櫎鍗曞畾鏃跺櫒澶栵紝杩樻湁瀵瑰簲鐨勫弻瀹氭椂鍣 556/7556銆555 瀹氭椂鍣ㄧ殑鐢垫簮鐢靛帇鑼冨洿瀹斤紝鍙湪 4.5V~16V 宸ヤ綔锛7555 鍙湪 3~18V 宸ヤ綔锛岃緭...
绛旓細555鏃跺熀鐢佃矾鏄竴绉嶅父鐢ㄧ殑璁℃椂鍣ㄧ數璺紝瀹冪敱涓変釜杈撳叆绔紙瑙﹀彂绔侀噸缃鍜屾帶鍒剁锛夊拰涓涓緭鍑虹缁勬垚銆傞氬父浣跨敤555IC锛堥泦鎴愮數璺級鏉ュ疄鐜拌繖绉嶇數璺傝Е鍙戠鐢ㄤ簬鍚姩璁℃椂锛岄噸缃鐢ㄤ簬鍋滄璁℃椂骞跺皢杈撳嚭閲嶇疆涓轰綆鐢靛钩锛屾帶鍒剁鐢ㄤ簬璋冩暣璁℃椂鏃堕棿銆傝緭鍑虹浼氬湪瑙﹀彂绔帴鍙楀埌淇″彿鍚庡彉涓洪珮鐢靛钩锛屽湪璁℃椂缁撴潫鍚庡彉鍥炰綆鐢靛钩銆...
绛旓細瀵逛簬鎶ヨ鍣ㄥ拰鑷姩鎺у埗鐢佃矾锛555闆嗘垚鐢佃矾鏇存槸濡傝檸娣荤考锛岄氳繃瀹冪殑瑙﹀彂鏈哄埗锛岃兘澶熷疄鐜扮簿纭殑瑙﹀彂鍜屽搷搴旓紝鎻愬崌绯荤粺鐨勬櫤鑳藉寲姘村钩銆傚湪浠櫒浠〃鐢佃矾涓紝瀹冪殑绮剧‘搴︿负娴嬮噺鍜屾娴嬫彁渚涗簡鍙潬淇濋殰銆傝嚦浜庡厖鐢靛櫒鍜岀數婧愮數璺紝555鏃跺熀闆嗘垚鐢佃矾鐨勭數鍘嬫帶鍒跺姛鑳戒娇鍏舵垚涓烘瀯寤虹ǔ瀹氱數婧愮郴缁熺殑鍏抽敭鍏冧欢銆傛荤殑鏉ヨ锛555鏃跺熀闆嗘垚鐢佃矾鏄...
绛旓細555鏃跺熀鐢佃矾鍒╃敤涓や釜姣旇緝鍣ㄦ潵妫娴嬭緭鍏ヤ俊鍙风數鍘嬶紝骞堕氳繃鎺у埗瑙﹀彂鍣ㄧ殑缃綅鍜屽浣嶆潵浜х敓杈撳嚭淇″彿銆傚唴閮ㄧ殑鍒嗗帇缃戠粶鎻愪緵鐢靛帇鍩哄噯缁欐瘮杈冨櫒锛屾瘮杈冨櫒鐨勮緭鍑轰俊鍙锋帶鍒惰Е鍙戝櫒鐨勭姸鎬併傚綋杈撳叆鐢靛帇瓒呰繃鍩哄噯鐢靛帇鏃讹紝姣旇緝鍣ㄨ緭鍑洪珮鐢靛钩锛岃Е鍙戝櫒琚疆浣嶏紱褰撹緭鍏ョ數鍘嬩綆浜庡熀鍑嗙數鍘嬫椂锛屾瘮杈冨櫒杈撳嚭浣庣數骞筹紝瑙﹀彂鍣ㄨ澶嶄綅銆傝Е鍙戝櫒鐨...
绛旓細555鏃跺熀鐢佃矾鏄竴绉嶅父鐢ㄧ殑銆佺伒娲荤殑鍗曡姱鐗囪鏃跺櫒锛屽彲鐢ㄤ簬澶氱搴旂敤锛屽璁℃椂銆佽鏁般佹尟鑽°佹帶鍒剁瓑銆傚畠鐢变笁涓鍙ｏ紙瑙﹀彂銆佹秷闅愩侀噸缃級鍜屼袱涓ā鎷熻緭鍏ョ锛堟帶鍒跺拰鐢靛帇杈撳叆锛夌粍鎴愩傚伐浣滃師鐞嗭細褰撹Е鍙戠鍙ｏ紙TRIG锛変粠楂樼數骞冲彉鎴愪綆鐢靛钩鏃讹紝555鏃跺熀鐢佃矾灏变細琚Е鍙戯紝鍚姩璁℃椂銆傝鏃惰繃绋嬩腑锛岀數鍘嬭緭鍏ョ锛圱HR锛夊拰鎺у埗绔...
绛旓細555鏃跺熀鐢佃矾鏄竴绉嶅父鐢ㄧ殑鍗曡姱鐗囧畾鏃跺櫒IC锛屽畠鍙互鐢ㄦ潵鐢熸垚绠鍗曠殑鏃堕棿闂撮殧鎴栬剦鍐层傚畠鍖呭惈浜嗕笁涓被姣斿缓绔嬬殑绋冲帇鍣紝涓涓簩鏋佺锛屼袱涓泦鐢垫瀬鏅朵綋绠″拰涓涓彲缂栫▼鐨勯棬鐢佃矾銆傚畠鍙互宸ヤ綔鍦ㄤ笁绉嶆ā寮忎笅:鍗曠ǔ鎬併佺绾垮拰閲嶅鑴夊啿锛屽苟鍙互閫氳繃澶栭儴鐢佃矾鏉ヨ皟鏁磋緭鍑哄懆鏈熴傞氬父锛555鏃跺熀鐢佃矾浼氳鐢ㄥ湪鏃堕棿鐭紝绮惧害楂橈紝绠鍗...
绛旓細R1 鏁板间笉鑳藉皬鏂1k , R2 鍜孋 鍐冲畾瑕佹眰鏂规尝棰戠巼锛孯2鏁板煎姣擱1瓒婂ぇ锛屽崰绌烘瘮瓒婃帴杩50%銆俁1=1.2k , R2=75k ,C= 0.01uF >>棰戠巼=952Hz , 鍗犵┖姣=50%銆
