Indlela yokukhetha i-MOSFET?

1. Qinisekisa uhlobo

 

-N-channel okanye i-P-channel: Khetha phakathi kwe-N-channel okanye i-P-channel MOSFET ngokusekelwe kuyilo lwesekethe. Ngokuqhelekileyo, ii-MOSFET ze-N-channel zisetyenziselwa ukutshintshela kwicala elisezantsi, ngelixa ii-MOSFET ze-P-channel zisetyenziselwa ukutshintshela kwicala eliphezulu.

 

2. Amanqaku ombane

 

- Ubuninzi boMbane woMbane woMbane (i-VDS): Misela owona mbane uphezulu wokukhupha amanzi ukuya kumthombo. Eli xabiso kufuneka lidlule uxinzelelo lwe-voltage yangempela kwisekethe kunye nomda owaneleyo wokhuseleko.

- Maximum Gate-Source Voltage (VGS): Qinisekisa ukuba iMOSFET iyahlangabezana neemfuno zombane wesekethe yokuqhuba kwaye ayigqithi kumda wombane wesango lomthombo.

 

3. Ubunakho bangoku

 

- Ireyithiweyo yangoku (ID): Khetha i-MOSFET enomthamo olinganisiweyo omkhulu kuno okanye olingana nowona mgangatho uphezulu ulindelekileyo kwisekethe. Qwalasela i-pulse peak current ukuqinisekisa ukuba i-MOSFET inokusingatha ubuninzi bangoku phantsi kwezi meko.

 

4. Ukuchasa (i-RDS(kwi))

 

- On-Resistance: I-on-resistance kukuxhathisa kweMOSFET xa iqhuba. Ukukhetha i-MOSFET ene-RDS ephantsi (kwi) kunciphisa ilahleko yamandla kwaye iphucula ukusebenza kakuhle.

 

5. Ukutshintsha ukusebenza

 

- Ukutshintsha iSpeed: Qwalasela i-switching frequency (FS) kunye nexesha lokunyuka / lokuwa kwe-MOSFET. Kwizicelo ze-frequency ephezulu, khetha i-MOSFET eneempawu zokutshintsha ngokukhawuleza.

- I-Capacitance: I-gate-drain, i-gate-source, kunye ne-drain-source capacitances ichaphazela isantya sokutshintsha kunye nokusebenza kakuhle, ngoko ke oku kufuneka kuqwalaselwe ngexesha lokukhetha.

 

6. Iphakheji kunye noLawulo lwe-Thermal

 

- Uhlobo lwePackage: Khetha uhlobo lwephakheji olufanelekileyo olusekwe kwisithuba sePCB, iimfuno zobushushu, kunye nenkqubo yokuvelisa. Ubungakanani kunye nokusebenza kwe-thermal yephakheji kuya kuba nefuthe ekunyuseni nasekupholiseni ukusebenza kakuhle kwe-MOSFET.

- Iimfuno ze-Thermal: Hlalutya iimfuno ze-thermal zenkqubo, ngakumbi phantsi kweemeko ezimbi kakhulu. Khetha i-MOSFET enokusebenza ngokuqhelekileyo phantsi kwezi meko ukunqanda ukusilela kwenkqubo ngenxa yobushushu obugqithisileyo.

 

7. Uluhlu lobushushu

 

- Qinisekisa ukuba uluhlu lobushushu obusebenzayo lweMOSFET luhambelana neemfuno zokusingqongileyo zenkqubo.

 

8. Ukuqwalaselwa kweSicelo esiKhethekileyo

 

- Usetyenziso lweVoltage ephantsi: Kusetyenziso olusebenzisa i-5V okanye i-3V amandla ombane, nikela ingqalelo kakhulu kwimida yombane wesango le-MOSFET.

- Usetyenziso olubanzi lweVolthage: I-MOSFET enediode eyakhelweyo yeZener inokufuneka ukuba icuthe ujingi wesango lombane.

- Ukusetyenziswa kweVoltage ephindwe kabini: Uyilo lweesekethe ezikhethekileyo lunokufuneka ukulawula i-MOSFET ekwicala eliphezulu ngokufanelekileyo ukusuka kwicala elisezantsi.

 

9. Ukuthembeka kunye noMgangatho

 

- Qwalasela igama lomenzi, ukuqinisekiswa komgangatho, kunye nokuzinza kwexesha elide lecandelo. Kwizicelo ezithembeke kakhulu, ibakala lemoto okanye ezinye ii-MOSFETs eziqinisekisiweyo zinokufuneka.

 

10. Iindleko kunye nokufumaneka

 

- Qwalasela iindleko ze-MOSFET kunye namaxesha okukhokela umboneleli kunye nozinzo lokubonelela, ukuqinisekisa ukuba icandelo lihlangabezana neemfuno zokusebenza kunye nebhajethi.

 

Isishwankathelo saManyathelo okuKhetha:

 

- Qinisekisa ukuba i-N-channel okanye i-P-channel MOSFET iyafuneka.

- Ukuseka amandla ombane aphezulu okukhutshwa kwamanzi (VDS) kunye nesango lomthombo wombane (VGS).

- Khetha i-MOSFET ene-rate yangoku (ID) enokusingatha imisinga ephezulu.

- Khetha i-MOSFET ene-RDS ephantsi (kwi) yokuphucula ukusebenza kakuhle.

- Qwalasela isantya sokutshintsha kwe-MOSFET kunye nefuthe lesakhono ekusebenzeni.

- Khetha uhlobo lwephakheji olufanelekileyo olusekwe kwisithuba, iimfuno zobushushu, kunye noyilo lwePCB.

- Qinisekisa ukuba ubushushu bokusebenza buhambelana neemfuno zenkqubo.

-Iakhawunti yeemfuno ezizodwa, ezifana nokunciphisa amandla ombane kunye noyilo lwesekethe.

- Vavanya ukuthembeka komenzi kunye nomgangatho.

- Umba weendleko kunye nozinzo lwekhonkco lonikezelo.

 

Xa ukhetha i-MOSFET, kuyacetyiswa ukuba ukhangele idatadata yesixhobo kwaye uqhube uhlalutyo olunzulu lwesekethe kunye nokubala ukuqinisekisa ukuba ihlangabezana nazo zonke iimeko zoyilo. Ukwenza ukulinganisa kunye novavanyo linyathelo elibalulekileyo lokuqinisekisa ukuchaneka kokhetho lwakho.