Idan aka kwatanta da LDO, da'irar DC-DC ta fi rikitarwa da hayaniya, kuma shimfidawa da buƙatun shimfidawa sun fi girma. Ingancin shimfidawa kai tsaye yana rinjayar aikin DC-DC, don haka yana da matukar muhimmanci a fahimci shimfidar DC-DC

1. Mummunan shimfidar wuri
●EMI, DC-DC SW fil zai sami mafi girma dv/dt, in mun gwada da babban dv/dt zai haifar da tsangwama mai girma na EMI;
● Ƙarƙashin ƙasa, layin ƙasa ba shi da kyau, zai haifar da ƙararrawa mai girma a kan waya ta ƙasa, kuma waɗannan kararraki za su shafi wasu sassa na kewaye;
● Ana haifar da raguwar wutar lantarki akan wayoyi. Idan na'urar ta yi tsayi da yawa, za a haifar da raguwar wutar lantarki a kan wayoyi, kuma za a rage ingancin duk DC-DC.

2. Gabaɗaya ka'idoji
● Canja babban da'irar halin yanzu a takaice kamar yadda zai yiwu;
● Ƙasar sigina da ƙasa mai girma (ƙasa mai ƙarfi) an lalata su daban kuma an haɗa su a wuri ɗaya a guntu GND.

① Gajeren madauki mai sauyawa
Jajayen LOOP1 a cikin hoton da ke ƙasa shine jagorar gudana na yanzu lokacin da babban gefen bututun DC-DC yana kunne kuma ƙananan bututun gefen yana kashe. Green LOOP2 shine jagorar gudana na yanzu lokacin da babban bututun gefen ke rufe kuma an buɗe ƙananan bututun gefe;

Domin sanya madaukai biyu ƙanƙanta gwargwadon yiwuwa kuma a gabatar da ƙarancin tsangwama, ana buƙatar bin ka'idodi masu zuwa:

●Inductance kusa da SW fil kamar yadda zai yiwu;
●Input capacitance a matsayin kusa da VIN fil kamar yadda zai yiwu;
●Ƙasa na abubuwan shigar da fitarwa ya kamata su kasance kusa da fil ɗin PGND.
●Yi amfani da hanyar shimfiɗa wayar tagulla;

Me yasa za ku yi haka?

●Mai kyau da tsayi da yawa layin zai ƙara haɓaka, kuma babban ƙarfin wuta zai haifar da ƙananan ƙarfin lantarki a cikin wannan babban impedance;
●Mai kyau da tsayi da yawa waya za ta ƙara yawan inductance na parasitic, kuma sautin haɗakarwa a kan inductance zai yi tasiri ga kwanciyar hankali na DC-DC kuma ya haifar da matsalolin EMI.
● The parasitic capacitance da impedance zai kara da sauyawa asara da kuma on-kashe hasara da kuma tasiri yadda ya dace na DC-DC

② saukowa wuri guda
Ƙaddamar da maki ɗaya yana nufin ƙaddamar da maki guda ɗaya tsakanin ƙasan sigina da ƙasa mai ƙarfi. Za a sami ƙaramar ƙarar ƙarar ƙararrawa a ƙasan wutar lantarki, don haka ya zama dole a guji haifar da tsangwama ga ƙananan sigina masu mahimmanci, kamar fil ɗin amsa FB.

● Babban ƙasa na yanzu: L, Cin, Cout, Cboot haɗi zuwa cibiyar sadarwa na ƙasa mai girma;
● Ƙananan ƙasa na yanzu: Css, Rfb1, Rfb2 an haɗa su daban zuwa cibiyar sadarwar ƙasa;

Mai zuwa shine tsarin hukumar haɓaka TI. Ja ita ce hanya ta yanzu lokacin da aka buɗe bututu na sama, kuma blue shine hanyar yanzu lokacin da aka buɗe ƙananan bututu. Tsarin shimfidar wuri yana da fa'idodi masu zuwa:

●GND na shigarwar shigarwa da masu samar da kayan aiki an haɗa su da jan karfe. Lokacin shigar da guda, ƙasa na biyu ya kamata a haɗa tare gwargwadon yiwuwar.
●Hanyar halin yanzu na Dc-Dc-ton da Toff gajere ne;
●Ƙananan siginar da ke hannun dama shine ƙasa mai tushe guda ɗaya, wanda ke da nisa daga tasirin babban amo na yanzu a hagu;

3. Misalai

An ba da tsarin da'irar DC-DC BUCK na yau da kullun a ƙasa, kuma ana ba da maki masu zuwa a cikin SPEC:
●Input capacitors, babban-baki MOS tubes, da diodes samar da sauyawa madaukai waɗanda suke da ƙanana da gajere kamar yadda zai yiwu;
● Input capacitance kamar yadda zai yiwu zuwa Vin Pin fil;
●Tabbatar da cewa duk hanyoyin haɗin kai gajere ne kuma kai tsaye, kuma cewa masu adawa da martani da abubuwan ramuwa suna kusa da guntu kamar yadda zai yiwu;
●SW nesa da sigina masu mahimmanci kamar FB;
●Haɗa VIN, SW, kuma musamman GND daban zuwa babban yanki na jan karfe don kwantar da guntu da inganta aikin zafi da aminci na dogon lokaci;

4. Takaitacce

layout na DC-DC kewaye yana da matukar muhimmanci, wanda kai tsaye rinjayar aiki da kwanciyar hankali da kuma aiki na DC-DC. Gabaɗaya, SPEC na guntu na DC-DC zai ba da jagorar shimfidawa, wanda za'a iya magana da shi don ƙira.