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銆€銆€2 闁�(k膩i)闂�(gu膩n)绌�(w臎n)澹撻浕婧愮殑绲�(ji茅)妲�(g貌u)

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銆€銆€3 闁�(k膩i)闂�(gu膩n)绌�(w臎n)澹撻浕婧愮殑鍎�(y艒u)榛�(di菐n)鍜岀己榛�(di菐n)

銆€銆€3.1 闁�(k膩i)闂�(gu膩n)绌�(w臎n)澹撻浕婧愮殑鍎�(y艒u)榛�(di菐n)

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銆€銆€婵炬尝鐨勬晥鐜囧ぇ鐐烘彁楂�锛屼娇婵炬尝闆诲鐨勫閲忓拰楂旂⿳澶х偤娓涘皯銆傞枊(k膩i)闂�(gu膩n)绌�(w臎n)澹撻浕婧愮殑宸ヤ綔闋荤巼鐩墠鍩烘湰涓婃槸宸ヤ綔鍦�50kHz锛屾槸绶氭€х┅(w臎n)澹撻浕婧愮殑1000鍊�锛岄€欎娇鏁存祦鍚庣殑婵炬尝鏁堢巼骞句箮涔熸彁楂樹簡1000鍊�銆傚氨鏄噰鐢ㄥ崐娉㈡暣娴佸悗鍔犻浕瀹规烤娉紝鏁堢巼涔熸彁楂樹簡 500鍊�銆傚湪鐩稿悓鐨勭磱娉㈣几鍑洪浕澹撲笅锛岄噰鐢ㄩ枊(k膩i)闂�(gu膩n)绌�(w臎n)澹撻浕婧愭檪(sh铆)锛屾烤娉㈤浕瀹圭殑瀹归噺鍙槸绶氭€х┅(w臎n)澹撻浕婧愪腑婵炬尝闆诲鐨�1锛�5001锛�1000銆�

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      3.2 闁�(k膩i)闂�(gu膩n)绌�(w臎n)澹撻浕婧愮殑缂洪粸(di菐n)

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銆€銆€4 LDO绨�(ji菐n)浠�

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�

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銆€銆€瀵�(sh铆)闅涚殑浣庡宸窔鎬х┅(w臎n)澹撳櫒閭勫叿鏈夊璨�(f霉)杓夌煭璺繚璀�(h霉)銆侀亷(gu貌)澹撻棞(gu膩n)鏂�銆侀亷(gu貌)鐔遍棞(gu膩n)鏂枫€佸弽鎺ヤ繚璀�(h霉)绛夊叾瀹冪殑鍔熻兘銆�

銆€銆€5 LDO鎳�(y墨ng)鐢ㄤ簬闁�(k膩i)闂�(gu膩n)闆绘簮

銆€銆€鐩墠澶уIC瑷�(sh猫)瑷�(j矛)鐢�(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銆傜偤SGM2007鐨勫吀鍨嬫噳(y墨ng)鐢ㄩ浕璺湒銆�

      鐩墠甯傚牬(ch菐ng)涓婂嚭鍞殑闁�(k膩i)闂�(gu膩n)闆绘簮涓噰鐢ㄩ洐妤垫€ф櫠楂旂鍒舵垚鐨勯枊(k膩i)闂�(gu膩n)闋荤巼100kHz锛岀敤 MOS-FET鍒舵垚鐨勯枊(k膩i)闂�(gu膩n)闋荤巼500kHz闆绘簮銆傞枊(k膩i)闂�(gu膩n)闆绘簮鐨勭獊鍑虹己榛�(di菐n)鏄敘(ch菐n)鐢熻純寮�(qi谩ng)鐨凟MI銆侲MI淇¤櫉(h脿o)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(hu矛)姹℃煋闆荤鐠�(hu谩n)澧�锛屽皪(du矛)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�(d膩ng)锛岄枊(k膩i)闂�(gu膩n)闆绘簮鏈韩灏辨渻(hu矛)璁婃垚涓€鍊�(g猫)骞叉摼婧愩€傜暥(d膩ng)鐢ㄩ枊(k膩i)闂�(gu膩n)闆绘簮鍋氱偤L(zh菐ng)DO鐨勮几鍏IN鏅�(sh铆)瑕佹敞鎰廘DO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�(du矛)杓稿叆绱嬫尝鎶戝埗鑳藉姏鐨勪竴鍊�(g猫)浜ゆ祦鍙冩暩(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(shu艒)鏄嶭DO鐨勭磱娉㈣兘鍔涜秺寮�(qi谩ng)锛屼篃灏辨槸瑾�(shu艒)杓稿叆灏�(du矛)杓稿嚭鐨勫奖闊垮緢灏�銆傜洝绠DO鐨勯浕婧愭姂鍒舵瘮寰堝挤(qi谩ng)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�(qi谩ng)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�锛岃€岄€欐闋荤巼姝ｆ槸澶у鏁�(sh霉)闁�(k膩i)闂�(gu膩n)闆绘簮鐨勫伐浣滈牷鐜�锛屽鏋淟DO鐨勮矤(f霉)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€�(g猫)LDO渚涢浕绯荤当(t菕ng)鐨勪笉绌�(w臎n)瀹氥€�

銆€銆€鐩墠甯傚牬(ch菐ng)涓婂嚭鍞殑闁�(k膩i)闂�(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�锛岃€屼竴鑸殑LDO鎳�(y墨ng)鐢ㄦ渶澶氱殑鏄�3.3V杓稿嚭鐨勶紝鍦ㄩ枊(k膩i)闂�(gu膩n)闆绘簮鐨勮几鍑哄仛鐐篖(zh菐ng)DO鐨勮几鍏ユ檪(sh铆)锛屽氨瀛樺湪涓€鍊�(g猫)寰堝ぇ鐨勫宸�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(hu矛)寰堥珮锛屽姛鑰楀緢澶�锛岄暦(zh菐ng)鏅�(sh铆)闁撳伐浣滃湪楂樻韩鐨勬儏娉佷笅锛屾渻(hu矛)褰遍熆鑺墖鐨勫伐浣滃＝鍛姐€�

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�(l谩i)瑷�(j矛)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�(sh铆)闅涘姛鑰�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�(f霉)杓�)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�(di菐n)鍒扮┖姘ｉ枔鐔遍樆(胃JA)鐨勫嚱鏁�(sh霉)銆傚皪(du矛)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�(sh铆)闅涘姛鑰桺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�(d膩ng)闁�(k膩i)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�(sh铆)锛屼竴瀹氳娉ㄦ剰闁�(k膩i)闂�(gu膩n)闆绘簮鐨勭磱娉�锛岄枊(k膩i)闂�(gu膩n)闋荤巼灏�(du矛)LDO鐨勫奖闊�锛屽強LDO璨�(f霉)杓夐浕瀹圭殑鍖归厤锛屼笉瑕佽秴閬�(gu貌)浠栫殑鏈€澶у姛鑰�锛屼互褰遍熆绯荤当(t菕ng)鐨勭┅(w臎n)瀹氭€с€�