Bokhoni ba heke, ho hanyetsa le likarolo tse ling tsa MOSFET

I. Bokgoni ba heke

Bophahamo ba heke haholo-holo bo kenyelletsa bokhoni ba ho kenya (Ciss), bokhoni ba tlhahiso (Coss) le bokhoni ba phetisetso ea morao (Crss, eo hape e tsejoang e le Miller capacitance).

 

Matla a Kenyeletso (Ciss):

 

TLHALOSO: The input capacitance ke kakaretso ea capacitance pakeng tsa heke le mohloli le drain, 'me e na le capacitance mohloli oa heke (Cgs) le heke drain capacitance (Cgd) e kopantsoeng ka tsela e tšoanang, ke hore Ciss = Cgs + Cgd.

 

Mosebetsi: Matla a ho kenya a ama lebelo la ho fetoha ha MOSFET. Ha matla a ho kenya a lefisoa ho motlakase oa monyako, sesebelisoa se ka buloa; e ntšitsoeng ho boleng bo itseng, sesebelisoa se ka tima. Ka hona, potoloho ea ho khanna le Ciss e na le tšusumetso e tobileng ho ho lieha ha sesebelisoa le ho tima.

 

Matla a tlhahiso (Coss):

Tlhaloso: The capacitance output ke kakaretso ea capacitance pakeng tsa drain le mohloli, 'me e na le drain-source capacitance (Cds) le heke-drain capacitance (Cgd) ka tsela e tšoanang, ke hore Coss = Cds + Cgd.

 

Karolo: Lits'ebetsong tse feto-fetohang habonolo, Coss e bohlokoa haholo hobane e ka baka molumo oa potoloho.

 

Matla a Phetiso ea Reverse (Crss):

Tlhaloso: The reverse transfer capacitance e lekana le gate drain capacitance (Cgd) mme hangata e bitsoa Miller capacitance.

 

Karolo: The reverse transfer capacitance ke parameter ea bohlokoa bakeng sa linako tsa ho phahama le ho oa ha switch, hape e ama nako ea ho lieha ho tima. Boleng ba capacitance bo fokotseha ha motlakase oa mohloli oa metsi o ntse o eketseha.

II. On-resistance (Rds(on))

 

Tlhaloso: On-resistance ke ho hanyetsana pakeng tsa mohloli le metsi a MOSFET sebakeng sa boemo bo itseng tlas'a maemo a itseng (mohlala, leakage current, motlakase oa heke, le mocheso).

 

Lintho tse susumetsang: Ho hanyetsa ha se boleng bo tsitsitseng, bo angoa ke mocheso, mocheso o phahameng, ho feta Rds(on). Ho feta moo, ha matla a ho mamella a phahame, ho ba le sebopeho se ka hare sa MOSFET, ho ba le matla a ho hanyetsa a holimo.

 

 

Bohlokoa: Ha ho etsoa moralo oa phepelo ea motlakase kapa potoloho ea mokhanni, hoa hlokahala ho nahana ka ho hanyetsa ha MOSFET, hobane hona joale ho phallang ka MOSFET ho tla sebelisa matla ho hanyetsa sena, 'me karolo ena ea matla a sebelisoang e bitsoa - tahlehelo ea ho hanyetsa. Ho khetha MOSFET e nang le khanyetso e tlase ho ka fokotsa tahlehelo ea ho hanyetsa.

 

Ea boraro, li-parameter tse ling tsa bohlokoa

Ntle le matla a heke le ho hanyetsa, MOSFET e na le lintlha tse ling tsa bohlokoa tse kang:

V(BR)DSS (Drain Source Breakdown Voltage):Matla a matla a metsi ao hona joale a phallang ka har'a drain a fihla boleng bo itseng mochesong o itseng 'me mohloli oa heke o khutsufalitsoe. Ka holim'a boleng bona, tube e ka 'na ea senyeha.

 

VGS(th) (Threshold Voltage):Matla a heke a hlokahalang ho etsa hore mocha oa tsamaiso o qale ho theha pakeng tsa mohloli le drain. Bakeng sa li-MOSFET tse tloaelehileng tsa N-channel, VT e ka ba 3 ho isa ho 6V.

 

ID (Boemo bo ka Feletseng bo Tsoelang Pele ho Khala Hona Joale):Boholo bo tsoelang pele ba DC hona joale bo ka lumelloang ke chip ka mocheso o phahameng o lekantsoeng oa mateano.

 

IDM (Boemo bo Fetang ba Mokelikeli oa Hona Joale):E bonts'a boemo ba pulsed hona joale boo sesebelisoa se ka bo sebetsanang, ha pulsed current e phahame haholo ho feta DC e tsoelang pele hona joale.

 

PD (matla a phahameng a ho felloa ke matla):sesebelisoa se ka senya boholo ba tšebeliso ea matla.

 

Ka kakaretso, matla a heke, ho hanyetsa le likarolo tse ling tsa MOSFET li bohlokoa ts'ebetsong le ts'ebetsong ea eona, 'me li hloka ho khethoa le ho raloa ho latela maemo le litlhoko tse khethehileng tsa kopo.