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浣庡绌�(w臎n)澹撳櫒鍦ㄩ枊闂�(gu膩n)闆绘簮涓殑鎳�(y墨ng)鐢�

鏅傞枔锛�2010-04-19 16:25:07渚嗘簮锛歽angliu

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銆€銆€4 LDO绨′粙

銆€銆€LDO鏄竴绋井鍔熻€楃殑浣庡宸窔鎬х┅(w臎n)澹撳櫒锛屽畠閫氬父鍏锋湁妤典綆鐨勮嚜鏈夊櫔鑱插拰杓冮珮鐨勯浕婧愭姂鍒舵瘮PSRR(PowerSupplyRejectionRatio)銆�

銆€銆€LDO浣庡宸窔鎬х┅(w臎n)澹撳櫒鐨勭祼(ji茅)妲�(g貌u)濡傚湒(2)涓昏鍖呮嫭鍟熷嫊闆昏矾銆佹亽娴佹簮鍋忕疆鍠厓銆佷娇鑳介浕璺�銆佽(di脿o)鏁村厓浠�銆佸熀婧栨簮銆佽宸斁澶у櫒銆佸弽楗嬮浕闃荤恫(w菐ng)绲�(lu貌)鍜屼繚璀烽浕璺瓑銆傚熀鏈伐浣滃師鐞嗘槸閫欐ǎ鐨勶細绯荤当(t菕ng)鍔犻浕锛屽鏋滀娇鑳借叧铏曚簬楂橀浕骞虫檪锛岄浕璺枊濮嬪暉鍕�锛屾亽娴佹簮闆昏矾绲︽暣鍊嬮浕璺彁渚涘亸缃�锛屽熀婧栨簮闆诲蹇€熷缓绔嬶紝杓稿嚭闅ㄨ憲杓稿叆涓嶆柗涓婂崌锛岀暥杓稿嚭鍗冲皣閬斿埌瑕�(gu墨)瀹氬€兼檪锛岀敱鍙嶉缍�(w菐ng)绲�(lu貌)寰楀埌鐨勮几鍑哄弽楗嬮浕澹撲篃鎺ヨ繎浜庡熀婧栭浕澹撳€�锛屾鏅傝宸斁澶у櫒灏囪几鍑哄弽楗嬮浕澹撳拰鍩烘簴闆诲涔嬮枔鐨勮宸皬淇¤櫉閫茶鏀惧ぇ锛屽啀缍�(j墨ng)瑾�(di脿o)鏁寸鏀惧ぇ鍒拌几鍑�锛屽緸鑰屽舰鎴愯矤鍙嶉锛屼繚璀変簡杓稿嚭闆诲绌�(w臎n)瀹氬湪瑕�(gu墨)瀹氬€间笂锛屽悓鐞嗗鏋滆几鍏ラ浕澹撹畩鍖栨垨杓稿嚭闆绘祦璁婂寲锛岄€欏€嬮枆鐠�(hu谩n)鍥炶矾灏囦娇杓稿嚭闆诲淇濇寔涓嶈畩锛屽嵆锛歏out=(R1+R2)锛廟2 脳Vref

銆€銆€瀵﹂殯鐨勪綆澹撳樊绶氭€х┅(w臎n)澹撳櫒閭勫叿鏈夊璨犺級鐭矾淇濊銆侀亷澹撻棞(gu膩n)鏂枫€侀亷鐔遍棞(gu膩n)鏂�銆佸弽鎺ヤ繚璀风瓑鍏跺畠鐨勫姛鑳姐€�

      5 LDO鎳�(y墨ng)鐢ㄤ簬闁嬮棞(gu膩n)闆绘簮

銆€銆€鐩墠澶уIC瑷�(sh猫)瑷堢敘(ch菐n)鍟嗙敓鐢�(ch菐n)鐨勪綆澹撳樊绶氭€х┅(w臎n)澹撳櫒(LDO)鍏稿瀷灏佽閮芥槸SOT23-5鍜孲OT23-3锛屽鍦i偊寰浕瀛愮殑SGM2007锛孲GM2013銆傚鍦�(3)鐐篠GM2007鐨勫吀鍨嬫噳(y墨ng)鐢ㄩ浕璺湒銆�

銆€銆€鐩墠甯傚牬涓婂嚭鍞殑闁嬮棞(gu膩n)闆绘簮涓噰鐢ㄩ洐妤垫€ф櫠楂旂鍒舵垚鐨勯枊闂�(gu膩n)闋荤巼100kHz锛岀敤 MOS-FET鍒舵垚鐨勯枊闂�(gu膩n)闋荤巼500kHz闆绘簮銆傞枊闂�(gu膩n)闆绘簮鐨勭獊鍑虹己榛炴槸鐢�(ch菐n)鐢熻純寮风殑EMI銆侲MI淇¤櫉鏃㈠叿鏈夊緢瀵殑闋荤巼鑼冨湇锛屽張鏈変竴瀹氱殑骞呭害锛岀稉(j墨ng)鍌冲皫(d菐o)鍜岃蓟灏勬渻姹℃煋闆荤鐠�(hu谩n)澧�锛屽皪閫氫俊瑷�(sh猫)鍌欏拰闆诲瓙鐢�(ch菐n)鍝侀€犳垚骞叉摼銆傚鏋滆檿鐞嗕笉鐣�锛岄枊闂�(gu膩n)闆绘簮鏈韩灏辨渻璁婃垚涓€鍊嬪共鎿炬簮銆傜暥鐢ㄩ枊闂�(gu膩n)闆绘簮鍋氱偤LDO鐨勮几鍏IN鏅傝娉ㄦ剰LDO闆绘簮鎶戝埗姣斿拰鍔熻€�銆�

銆€銆€闆绘簮鎶戝埗姣擯SRR(Power supply ripple rejectionratio)鏄弽鎳�(y墨ng)LDO杓稿嚭灏嶈几鍏ョ磱娉㈡姂鍒惰兘鍔涚殑涓€鍊嬩氦娴佸弮鏁�(sh霉)锛屼竴鑸几鍑哄拰杓稿叆鐨勯牷鐜囨槸涓€妯g殑锛孭SRR鐨勫€艰秺澶ц鏄嶭DO鐨勭磱娉㈣兘鍔涜秺寮凤紝涔熷氨鏄杓稿叆灏嶈几鍑虹殑褰遍熆寰堝皬銆傜洝绠DO鐨勯浕婧愭姂鍒舵瘮寰堝挤锛屼絾閮芥槸鍦ㄤ竴瀹氶牷鐜囧収(n猫i)鐨勬姂鍒跺緢寮�锛屼竴鑸殑鍦�50KHz鍒�200kHz鐨勯浕婧愭姂鍒舵瘮閭勬槸寰堝樊鐨勫鍦�(4)鐐篠GM2007鐨凱SRR鍜岄牷鐜囨洸绶氾紝鑰岄€欐闋荤巼姝f槸澶у鏁�(sh霉)闁嬮棞(gu膩n)闆绘簮鐨勫伐浣滈牷鐜�锛屽鏋淟DO鐨勮矤杓夊拰杓稿叆杓稿嚭闆诲鍖归厤涓嶅ソ锛屽緢瀹规槗寮曡捣LDO鎸暕銆傝€岄€犳垚鏁村€婰DO渚涢浕绯荤当(t菕ng)鐨勪笉绌�(w臎n)瀹�銆�

銆€銆€鐩墠甯傚牬涓婂嚭鍞殑闁嬮棞(gu膩n)闆绘簮澶у鏁�(sh霉)閮芥槸鍥哄畾闆诲杓稿嚭鐨�锛屼竴鑸父鐢ㄩ兘鏄�5V杓稿嚭鐨勶紝鑰屼竴鑸殑LDO鎳�(y墨ng)鐢ㄦ渶澶氱殑鏄�3.3V杓稿嚭鐨�锛屽湪闁嬮棞(gu膩n)闆绘簮鐨勮几鍑哄仛鐐篖DO鐨勮几鍏ユ檪锛屽氨瀛樺湪涓€鍊嬪緢澶х殑澹撳樊锛岀偤1.7V銆傚鏋淟DO闆绘祦寰堝ぇ鐨勮┍濡� 200mA锛岄偅涔堣姱鐗囩殑婧害灏辨渻寰堥珮锛屽姛鑰楀緢澶э紝闀锋檪闁撳伐浣滃湪楂樻韩鐨勬儏娉佷笅锛屾渻褰遍熆鑺墖鐨勫伐浣滃=鍛�銆�

銆€銆€浣庡宸窔鎬х┅(w臎n)澹撳櫒鍔熻€椾富瑕佹槸杓稿叆闆诲锛岃几鍑洪浕澹撲互鍙婅几鍑洪浕娴佺殑鍑芥暩(sh霉)銆備笅鍒楁柟绋嬪紡鍙敤渚嗚▓绠楁渶鎯″姡鎯呮硜涓嬬殑鍔熻€楋細

銆€銆€PD=(VINMAX-VOUTMIN)ILMAX銆傚叾涓細PD=鏈€鎯″姡鎯呮硜涓嬬殑瀵﹂殯鍔熻€�锛孷INMAX=VIN鑵充笂鐨勬渶澶ч浕澹擄紝VOUTMIN=绌�(w臎n)澹撳櫒杓稿嚭鐨勬渶灏忛浕澹�锛孖LMAX=鏈€澶�(璨犺級)杓稿嚭闆绘祦銆�

銆€銆€鏈€澶у厑瑷卞姛鑰�(PDMAX)鏄渶澶х挵(hu谩n)澧冩韩搴�(TAMAX)锛屾渶澶у厑瑷辩祼(ji茅)婧�(TJMAX)(+125鈩�)鍜岀祼(ji茅)榛炲埌绌烘埃闁撶啽闃�(胃JA)鐨勫嚱鏁�(sh霉)銆傚皪浜庡畨瑁濆湪鍏稿瀷闆欏堡FR4闆昏В閵呴崓灞CB鏉夸笂鐨�5寮曡叧SOT-23灏佽鍣ㄤ欢锛屽叾(胃JA)绱勭偤250鈩冿紡Watt銆�

銆€銆€PDMAX=(TAMAX-TJMAX)/胃JA

銆€銆€VINMAX=3.0V+10锛�锛孷OUTMIN=2.7V-2.5锛�锛孖LOADMAX=40mA锛孴JMAX=+125鈩�锛孴AMAX=+55鈩�

銆€銆€瀵﹂殯鍔熻€桺D=26.7mW锛屾渶澶у厑瑷卞姛鑰楋細PDMAX=280mW

銆€銆€6 绲�(ji茅)璜�

銆€銆€鐣堕枊闂�(gu膩n)闆绘簮鍋氱偤浣庡宸窔鎬х┅(w臎n)澹撳櫒杓稿叆鏅�锛屼竴瀹氳娉ㄦ剰闁嬮棞(gu膩n)闆绘簮鐨勭磱娉紝闁嬮棞(gu膩n)闋荤巼灏峀DO鐨勫奖闊�锛屽強LDO璨犺級闆诲鐨勫尮閰�锛屼笉瑕佽秴閬庝粬鐨勬渶澶у姛鑰楋紝浠ュ奖闊跨郴绲�(t菕ng)鐨勭┅(w臎n)瀹氭€�銆�

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