LP87524BRNFRQ1 VQFN-HR26 Izixhobo ezitsha zoQoqosho eziDityanisiweyo zeSekethe ye-IC LP87524BRNFRQ1

1.

Umsebenzi wokuguqula

Isiguquli sisixhobo esiguqula umqondiso ube ngolunye uphawu.Isiginali luhlobo okanye umthwali wolwazi olukhoyo, kwaye kwisixhobo sokwenza izixhobo ezizenzekelayo kunye neenkqubo zolawulo oluzenzekelayo, isiginali isoloko iguqulelwa kolunye umqondiso oluthelekiswa nomgangatho okanye ubungakanani bereferensi yokudibanisa ezi ntlobo zimbini zesixhobo kunye, umguquli udla ngokuba likhonkco eliphakathi phakathi kwezixhobo ezibini (okanye izixhobo).

2.

Zisebenza njani iziguquli zemali

Isiguquli se-buck yindlela yokutshintsha amandla ombane, iklasi yesixhobo equlethe iswitshi (ngokuqhelekileyo i-MOSFET) ukucima ngokukhawuleza isekethe, oku kutshintsha ngokukhawuleza kuvelisa i-square wave, ukuba umjikelo womsebenzi wokutshintsha usetelwe ukuya. I-50%, oko kukuthi i-switch ikwi-50% yexesha, i-voltage ephakathi iya kuba yi-50% yegalelo.

I-square wave kufuneka igudiswe ukuze inike amandla aluncedo kwaye kaninzi i-inductors kunye ne-capacitors zisetyenziselwa uchungechunge ukufezekisa lo msebenzi.Olu luhlu lubizwa ngokuba yi-LC low-pass filter, apho iimpawu ze-inductor zigudisa ngoku kwaye i-capacitor imelana nokutshintsha ngokukhawuleza kumbane.Isiphumo esidityanisiweyo sivelisa imveliso yombane egudileyo kunye ne-ripple ephantsi.Ngokomzekelo, ukuba i-voltage yegalelo yi-10V kwaye iswitshi isebenzisa umjikelezo we-50% womsebenzi, i-voltage ephumayo iya kuba yi-5V.

Elinye icandelo eliyimfuneko le-buck converter yi-diode okanye enye iswitshi edibeneyo ngokuhambelana ne-inductor.Oku kukuhlawula umsebenzi we-inductor, apho i-current in inductor ayikwazi ukutshintshwa ngokukhawuleza, ukukhusela iibhubhu zokutshintsha kumonakalo ngokugqithisa.

I-buck converter iqulethe i-circuitry eyongezelelweyo ukuqinisekisa i-voltage ephumayo ezinzileyo.Umguquli usebenzisa iskimu sokulawula i-loop evaliweyo kunye nengxelo engalunganga yokubeka iliso kwi-voltage output kunye nokulungelelanisa ngokuguquguqukayo umjikelezo womsebenzi wokutshintsha ukulawula umbane wokuphuma.

3.

Iingqwalasela zoyilo zabaguquli bebhaka

iziguquli zebhaki zisebenza kakuhle kakhulu, kwaye ezinye izixhobo zisebenza ngempumelelo ngaphezulu kwe-95%.

abaguquli be-buck babiza imali eninzi kunabalawuli bemigca kumanqanaba aphezulu ombane, apho ixabiso lokupholisa lomlawuli womgama linokuba ngaphantsi kweendleko zokusebenzisa isiguquli sebhaki.

imveliso yoguqulo lwebhaki iqulathe ingxolo, nto leyo ethetha ukuba imveliso yolawulo lomgama izinzile kwaye ifaneleke ngcono kwizicelo ezifuna ingxolo esezantsi.

abalawuli bemigca banokuphendula ngokukhawuleza kwigalelo kunye notshintsho lwemveliso xa kuthelekiswa nabaguquli bebhaki.