Kumvetsetsa mfundo yogwirira ntchito ya MOSFET ndikugwiritsa ntchito zida zamagetsi moyenera

Kumvetsetsa mfundo zoyendetsera ntchito za MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistors) ndikofunikira kuti tigwiritse ntchito bwino zida zamagetsi zamagetsi zamagetsi. Ma MOSFET ndi zinthu zofunika kwambiri pazida zamagetsi, ndipo kuzimvetsetsa ndikofunikira kwa opanga.

M'malo mwake, pali opanga omwe sangayamikire mokwanira ntchito za MOSFET panthawi yomwe akugwiritsa ntchito. Komabe, pogwira mfundo zogwirira ntchito za MOSFET pazida zamagetsi ndi maudindo awo ofananira, munthu amatha kusankha mwanzeru MOSFET yoyenera, poganizira mawonekedwe ake apadera komanso mawonekedwe ake enieni. Njirayi imapangitsa kuti malondawo azigwira ntchito bwino, ndikulimbitsa mpikisano wake pamsika.

WINSOK SOT-23-3 phukusi MOSFET

Mfundo Zogwirira Ntchito za MOSFET

Pamene magetsi a gate-source (VGS) a MOSFET ali ziro, ngakhale atagwiritsa ntchito mphamvu ya drain-source (VDS), nthawi zonse pamakhala phokoso la PN motsatira kukondera, zomwe zimapangitsa kuti pasakhale njira yoyendetsera (ndipo palibe panopa) pakati pawo. kukhetsa ndi gwero la MOSFET. Munthawi imeneyi, kukhetsa kwapano (ID) kwa MOSFET ndi ziro. Kugwiritsa ntchito magetsi abwino pakati pa chipata ndi gwero (VGS> 0) kumapanga malo amagetsi mu SiO2 insulating wosanjikiza pakati pa chipata cha MOSFET ndi gawo lapansi la silicon, lolunjika kuchokera pachipata kupita ku gawo la P-mtundu wa silicon. Popeza kuti oxide wosanjikiza ndi insulating, voteji ntchito pachipata, VGS, sangathe kupanga panopa mu MOSFET. M'malo mwake, amapanga capacitor kudutsa oxide wosanjikiza.

Pamene VGS ikuwonjezeka pang'onopang'ono, capacitor imakwera, ndikupanga malo amagetsi. Kukopeka ndi voteji yabwino pachipata, ma electron ambiri amaunjikana mbali ina ya capacitor, kupanga njira ya N-mtundu wa conductive kuchokera kukhetsa kupita ku gwero la MOSFET. VGS ikadutsa malire a VT (nthawi zambiri mozungulira 2V), njira ya N ya MOSFET imayendetsa, ndikuyambitsa kutuluka kwa ID yapano. Mphamvu yamagetsi yomwe njirayo imayambira imatchedwa threshold voltage VT. Poyang'anira kukula kwa VGS, ndipo chifukwa chake malo amagetsi, kukula kwa ID yomwe ilipo mu MOSFET ikhoza kusinthidwa.

WINSOK DFN5x6-8 phukusi MOSFET

Mapulogalamu a MOSFET

MOSFET imadziwika chifukwa cha mawonekedwe ake abwino osinthira, zomwe zimapangitsa kuti igwiritse ntchito kwambiri mabwalo omwe amafunikira ma switch amagetsi, monga magetsi osinthira. Pogwiritsira ntchito magetsi otsika kwambiri pogwiritsa ntchito magetsi a 5V, kugwiritsa ntchito zipangizo zamakono kumabweretsa kutsika kwa magetsi pamtunda wa bipolar junction transistor (pafupifupi 0.7V), kusiya 4.3V yokha yamagetsi omaliza omwe amagwiritsidwa ntchito pachipata cha MOSFET. Muzochitika zotere, kusankha MOSFET yokhala ndi voteji yachipata cha 4.5V kumabweretsa zoopsa zina. Vutoli limawonekeranso pamapulogalamu okhudzana ndi 3V kapena magetsi ena otsika kwambiri.