Nzwisisa musimboti wekushanda weMOSFET uye shandisa zvinhu zvemagetsi zvinobudirira

Kunzwisisa misimboti yekushanda kweMOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistors) kwakakosha pakushandisa zvinobudirira izvi zvemagetsi zvikamu zvemagetsi. MOSFET zvinhu zvakakosha mumidziyo yemagetsi, uye kuzvinzwisisa kwakakosha kune vanogadzira.

Mukuita, kune vagadziri vanogona kusakoshesa zvizere mabasa eMOSFET panguva yekushandisa kwavo. Zvakangodaro, nekubata misimboti yekushanda kweMOSFET mumidziyo yemagetsi nemabasa anoenderana, munhu anogona kusarudza zvine hungwaru iyo yakanyanya kufanira MOSFET, achifunga nezvayo akasiyana maitiro uye chaiwo maitiro echigadzirwa. Iyi nzira inowedzera kushanda kwechigadzirwa, ichisimbisa kukwikwidza kwayo mumusika.

WINSOK SOT-23-3 pasuru MOSFET

MOSFET Misimboti Yekushanda

Kana gedhi-source voltage (VGS) yeMOSFET iri zero, kunyangwe nekushandiswa kwedrain-source voltage (VDS), panogara paine PN junction mukureverse bias, zvichikonzera kusave neconductive chiteshi (uye pasina ikozvino) pakati. iyo yekudonha uye sosi yeMOSFET. Mune ino mamiriro, iyo yekudonhedza ikozvino (ID) yeMOSFET zero. Kushandisa yakanaka voltage pakati pegedhi uye sosi (VGS> 0) inogadzira munda wemagetsi muSiO2 insulating layer pakati pegedhi reMOSFET nesilicon substrate, inotungamirwa kubva kugedhi yakananga kuP-mhando silicon substrate. Tichifunga kuti iyo oxide layer iri insulating, iyo voltage inoshandiswa kugedhi, VGS, haigone kuburitsa ikozvino muMOSFET. Pane kudaro, inoumba capacitor kuyambuka oxide layer.

Sezvo VGS ichiwedzera zvishoma nezvishoma, iyo capacitor inobhadharisa kumusoro, ichigadzira munda wemagetsi. Akwezvwa nevoltage yakanaka pagedhi, maerekitironi akawanda anoungana kune rimwe divi recapacitor, achigadzira N-mhando conductive chiteshi kubva kudhireni kuenda kutsime muMOSFET. Kana VGS ichidarika chikumbaridzo voltage VT (kazhinji yakatenderedza 2V), iyo N-chiteshi cheMOSFET inoitisa, ichitanga kuyerera kweiyo ID ikozvino. Iyo gedhi-sosi voltage painotangisa kuumbwa chiteshi inodaidzwa sechikumbaridzo voltage VT. Nekudzora ukuru hweVGS, uye nekudaro munda wemagetsi, saizi yedhinhi ikozvino ID muMOSFET inogona kugadziridzwa.

WINSOK DFN5x6-8 pasuru MOSFET

MOSFET Applications

Iyo MOSFET inozivikanwa neayo akanakisa ekuchinja maitiro, zvichiita kuti ishandiswe yakakura mumaseketi anoda ma switch emagetsi, senge switch-mode magetsi ekushandisa. Muzvishandiso zvakaderera-voltage uchishandisa magetsi e5V, kushandiswa kwezvimiro zvechinyakare kunoguma nekudonha kwevoltage pabase-emitter yebipolar junction transistor (inenge 0.7V), ichisiya 4.3V chete yemagetsi ekupedzisira anoiswa pagedhi re iyo MOSFET. Mumamiriro ezvinhu akadai, kusarudza MOSFET ine zita regedhi voltage ye4.5V kunounza dzimwe njodzi. Dambudziko iri rinoratidzirawo mumashandisirwo anosanganisira 3V kana mamwe magetsi akaderera-voltage.