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鎮ㄥソ锛屾杩庝締鍒扮董搴浕瀛愬競鍫寸恫(w菐ng) 鐧婚寗 | 鍏嶈不(f猫i)娉ㄥ唺

uc3842
闁辫畝锛�3692鏅�(sh铆)闁擄細2017-05-10 12:01:19

銆�銆�UC3842鏄竴绋�ц兘鍎�(y艒u)鑹殑闆绘祦鎺у埗鍨�鑴堝瑾�(di脿o)鍒�鑺墖銆傝┎瑾�(di脿o)鍒跺櫒鍠杓稿嚭锛岃兘鐩存帴椹�(q奴)鍕�(d貌ng)闆欐サ鍨嬬殑鍔熺巼绠�鎴�鍫存晥鎳�(y墨ng)绠�銆�

涓昏鍔熻兘

銆�銆�UC3842 閲囩敤鍥哄畾宸ヤ綔闋荤巼鑴堟矕瀵害鍙帶瑾�(di脿o)鍒舵柟寮�锛屽叡鏈�8 鍊�(g猫)寮曡叧锛屽悇鑵冲姛鑳藉涓嬶細
銆�銆�鈶犺叧鏄宸斁澶у櫒鐨勮几鍑虹锛屽鎺ラ樆瀹瑰厓浠剁敤浜庢敼鍠勮宸斁澶у櫒鐨勫鐩婂拰闋荤巼鐗规�э紱
銆�?銆佽皜_鏄弽楗嬮浕澹撹几鍏ョ锛屾鑵抽浕澹撹垏瑾ゅ樊鏀惧ぇ鍣ㄥ悓鐩哥鐨�2.5V 鍩烘簴(zh菙n)闆诲閫�(j矛n)琛屾瘮杓冿紝鐢�(ch菐n)鐢熻宸浕澹�锛屽緸鑰屾帶鍒惰剤娌栧搴︼紱
銆�?銆佸嫲_鐐洪浕娴佹娓几鍏ョ锛� 鐣�(d膩ng)妾㈡脯闆诲瓒呴亷1V鏅�(sh铆)绺皬鑴堟矕瀵害浣块浕婧愯檿浜庨枔姝囧伐浣滅媭鎱�(t脿i)锛�
銆�?銆佽嫞_鐐哄畾鏅�(sh铆)绔�锛屽収(n猫i)閮ㄦ尟钑╁櫒鐨勫伐浣滈牷鐜囩敱澶栨帴鐨勯樆瀹规檪(sh铆)闁撳父鏁�(sh霉)姹哄畾锛宖=1.72/(RT脳CT)锛�
銆�?銆佽徑_鐐哄叕鍏卞湴绔紱
銆�?銆佸紙_鐐烘帹鎸借几鍑虹锛屽収(n猫i)閮ㄧ偤鍦栭ò鏌卞紡锛屼笂鍗�銆佷笅闄嶆檪(sh铆)闁撳儏鐐�50ns 椹�(q奴)鍕�(d貌ng)鑳藉姏鐐郝�1A 锛�
銆�?銆佸悾_鏄洿娴侀浕婧愪緵闆荤锛屽叿鏈夋瑺銆侀亷澹撻帠瀹氬姛鑳�锛岃姱鐗囧姛鑰楃偤15mW锛�
銆�?銆佸梽_鐐�5V 鍩烘簴(zh菙n)闆诲杓稿嚭绔紝鏈�50mA 鐨勮矤(f霉)杓夎兘鍔�銆�
銆�銆�The UC3842 are fixed frequencycurrent-mode PWM controller. They are specially designed for Off-Line and DC to DC converter applications with minimum external components. These integrated circuits feature a trimmed oscillator for precise duty cycle control, a temperature compensated reference, high gain error amplifier, current sensing comparator and a high current totempole output for driving a Power MOSFET. The UC3842 and UC3844 have UVLO thresholds of 16V (on) and 10V (off). The UC3843 and UC3845 are 8.5V(on) and 7.9V (off). The UC3842 and UC3843 can operate within 100% duty cycle. The UC3844 and UC3845 can operate with 50% duty cycle.

宸ヤ綔鍘熺悊

銆�銆�鏄竴绋�ц兘鍎�(y艒u)鑹殑闆绘祦鎺у埗鍨嬭剤瀵(di脿o)鍒惰姱鐗�銆傝┎瑾�(di脿o)鍒跺櫒鍠杓稿嚭锛岃兘鐩存帴椹�(q奴)鍕�(d貌ng)闆欐サ鍨嬬殑鍔熺巼绠℃垨鍫存晥鎳�(y墨ng)绠°�傚叾涓昏鍎�(y艒u)榛�(di菐n)鏄叾绠¤叧鏁堟噳(y墨ng)灏�锛屽鍦嶉浕璺啊鍠�锛岄浕澹撹(di脿o)鏁寸巼鍙仈(d谩)0.01%锛屽伐浣滈牷鐜囬仈(d谩)500KHz锛屽暉鍕�(d貌ng)闆绘祦灏忎簬1mA锛屾甯稿伐浣滈浕娴佺偤5mA锛屽苟鍙埄鐢ㄩ珮闋昏畩澹撳櫒瀵�(sh铆)鐝�(xi脿n)鑸囬浕缍�(w菐ng)鐨勯殧闆�銆傝┎鑺墖闆嗘垚浜嗘尟钑╁櫒銆佸叿鏈夐珮婧(b菙)鍎�?sh霉)姣嶅挻椴嗗`宸斁澶у櫒銆侀浕娴佹娓瘮杓冨櫒銆佸湒楱版煴杓稿嚭闆绘祦銆佽几鍏ュ拰鍩烘簴(zh菙n)娆犻浕澹撻帠瀹氶浕璺互鍙奝WM閹栧瓨鍣ㄩ浕璺�銆�

鐩搁棞(gu膩n)鎺㈣◣

銆�銆�鎳�(y墨ng)鐢ㄤ簬闆诲鍙嶉闆昏矾鐨勬帰瑷�
銆�銆�閫氬父锛孭WM 鍨嬮枊闂�(gu膩n)闆绘簮鎶婅几鍑洪浕澹撶殑閲囨ǎ浣滅偤PWM 鎺у埗鍣ㄧ殑鍙嶉闆诲锛岃┎鍙嶉闆诲缍�(j墨ng)PWM 鎺у埗鍣ㄥ収(n猫i)閮ㄧ殑瑾ゅ樊鏀惧ぇ鍣ㄥ悗锛岃(di脿o)鏁撮枊闂�(gu膩n)淇¤櫉(h脿o)鐨勫崰绌烘瘮浠ュ(sh铆)鐝�(xi脿n)杓稿嚭闆诲鐨勭┅(w臎n)瀹�銆備絾涓嶅悓鐨� 闆诲鍙嶉闆昏矾锛屽叾杓稿嚭闆诲鐨勭┅(w臎n)瀹氬害鏄笉鍚岀殑銆�
銆�銆�UC3842鐨勯枊闂�(gu膩n)闆绘簮淇濊(h霉)闆昏矾鐨勬敼閫�(j矛n)
銆�銆�UC3842鐨勯枊闂�(gu膩n)闆绘簮淇濊(h霉)闆昏矾鐨勬敼閫�(j矛n)
銆�銆�鏂囦腑灏嶉浕娴佸瀷鑴堝鎺у埗鍣║C3842甯哥敤鐨勪笁绋� 绌�(w臎n)瀹氳几鍑洪浕澹撻浕璺綔浜嗕粙绱癸紝鍒嗘瀽鍏跺悇鑷殑鍎�(y艒u)缂洪粸(di菐n)锛屽湪姝ゅ熀绀�(ch菙)涓婅ō(sh猫)瑷�(j矛)浜嗕竴绋柊鐨勯浕澹撳弽楗嬮浕璺�锛屽(sh铆)椹�(y脿n)璀夋槑閫欑ó鏂扮殑闆昏矾鍏锋湁寰堝ソ鐨勭┅(w臎n)澹撴晥鏋溿��

鍎�(y艒u)榛�(di菐n)浠嬬垂

UC3842鏄枊闂�(gu膩n)闆绘簮鐢ㄩ浕娴佹帶鍒舵柟寮忕殑鑴堝瑾�(di脿o)鍒堕泦鎴愰浕璺�銆傝垏闆诲鎺у埗鏂瑰紡鐩告瘮鍦ㄨ矤(f霉)杓夐熆鎳�(y墨ng)鍜岀窔鎬ц(di脿o)
鏁村害绛夋柟闈㈡湁寰堝鍎�(y艒u)瓒婁箣铏曘��
瑭查浕璺富瑕佺壒榛�(di菐n)鏈夛細
鍏�(n猫i)鍚瑺闆诲閹栧畾闆昏矾
浣庡暉鍕�(d貌ng)闆绘祦锛堝吀鍨嬪�肩偤 0.12mA锛�
绌�(w臎n)瀹氱殑鍏�(n猫i)閮ㄥ熀婧�(zh菙n)闆诲婧�
澶ч浕娴佹帹鎸借几鍑猴紙椹�(q奴)鍕�(d貌ng)闆绘祦閬�(d谩) 1A锛�
宸ヤ綔闋荤巼鍙埌 500kHz
鑷嫊(d貌ng)璨�(f霉)鍙嶉瑁�(b菙)鍎熼浕璺�
闆欒剤娌栨姂鍒�
杓冨挤(qi谩ng)鐨勮矤(f霉)杓夐熆鎳�(y墨ng)鐗规��
鏂规鍦�

缍韩闆诲瓙閫氾紝闆诲瓙鐭ヨ瓨(sh铆)锛屼竴鏌ョ櫨閫氾紒

宸叉敹閷勮姊�160382鍊�(g猫)