Ƙofar capacitance, kan-juriya da sauran sigogi na MOSFETs

I. Ƙofar capacitance

Ƙofar capacitance ya haɗa da ƙarfin shigarwa (Ciss), ƙarfin fitarwa (Coss) da ƙarfin canja wuri (Crss, kuma aka sani da Miller capacitance).

Ƙarfin shigarwa (Ciss):

BAYANI: Matsakaicin ƙarfin shigarwa shine jimlar ƙarfin da ke tsakanin ƙofar da tushen da magudanar ruwa, kuma ya ƙunshi ƙarfin tushen ƙofar ƙofar (Cgs) da ƙarfin magudanar ruwa (Cgd) wanda aka haɗa a layi daya, watau Ciss = Cgs + Cgd.

Aiki: Ƙarfin shigarwa yana rinjayar saurin sauyawa na MOSFET. Lokacin da aka yi cajin ƙarfin shigarwar zuwa wutar lantarki na kofa, ana iya kunna na'urar; fitarwa zuwa wani ƙima, ana iya kashe na'urar. Saboda haka, da'irar tuƙi da Ciss suna da tasiri kai tsaye akan kunnawa da jinkirin kashe na'urar.

Ƙarfin fitarwa (Coss):

Ma'anar: Ƙarfin fitarwa shine jimlar ƙarfin da ke tsakanin magudanar ruwa da tushen, kuma ya ƙunshi magudanar ruwa-source capacitance (Cds) da ƙarfin magudanar ruwa (Cgd) a layi daya, watau Coss = Cds + Cgd.

Matsayi: A cikin aikace-aikace masu sauƙi-canzawa, Coss yana da mahimmanci sosai saboda yana iya haifar da resonance a cikin kewaye.

Ƙarfin Isar da Juya (Crss):

Ma'anar: Ƙarfin canja wuri na baya yana daidai da ƙarfin magudanar ruwa (Cgd) kuma galibi ana kiransa capacitance Miller.

Matsayi: Ƙaƙƙarfan ƙarfin canja wuri shine muhimmin ma'auni don lokacin tashi da faɗuwar canjin, kuma yana rinjayar lokacin jinkirin kashewa. Ƙimar ƙarfin ƙarfin ƙarfi yana raguwa yayin da ƙarfin magudanar ruwa ya karu.

II. Kan-juriya (Rds(on))

Ma'anar: Kan-juriya shine juriya tsakanin tushe da magudanar ruwa na MOSFET a cikin kan-jihar a ƙarƙashin takamaiman yanayi (misali, ƙayyadaddun yayyan halin yanzu, wutar lantarki, da zafin jiki).

Abubuwan da ke tasiri: Juriya ba ƙayyadaddun ƙima ba ne, zafin jiki yana shafar shi, mafi girman zafin jiki, mafi girma Rds (on). Bugu da ƙari, mafi girman ƙarfin juriya, mafi girman tsarin ciki na MOSFET, mafi girma daidai da juriya.

Muhimmanci: Lokacin zayyana wutar lantarki mai sauyawa ko da'irar direba, ya zama dole a yi la'akari da juriya na MOSFET, saboda halin yanzu da ke gudana ta MOSFET zai cinye makamashi akan wannan juriya, kuma ana kiran wannan ɓangaren makamashin da ake amfani da shi. juriya hasara. Zaɓin MOSFET tare da ƙarancin juriya na iya rage asarar juriya.

Na uku, wasu muhimman sigogi

Baya ga iyawar ƙofar kofa da juriya, MOSFET tana da wasu mahimman sigogi kamar:

V(BR) DSS (Tsarin Ƙarfafa wutar lantarki):Wutar wutar lantarki ta magudanar ruwa wanda halin yanzu ke gudana ta cikin magudanar ya kai takamaiman ƙima a takamaiman zafin jiki kuma tare da gajeriyar hanyar ƙofar. Sama da wannan ƙimar, bututu na iya lalacewa.

VGS(th) (Tsarin Wutar Lantarki):Wutar lantarkin ƙofar da ake buƙata don haifar da tashar gudanarwa ta fara farawa tsakanin tushen da magudanar ruwa. Don daidaitaccen tashar N-tashar MOSFET, VT yana kusan 3 zuwa 6V.

ID (Mafi girman Cigaban Ruwa na Ci gaba):Matsakaicin ci gaba na DC na yanzu wanda guntu zai iya ba da izini a matsakaicin matsakaicin zafin mahaɗa.

IDM (Mafi Girman Ruwan Ruwa na Yanzu):Yana nuna matakin bugun halin yanzu wanda na'urar za ta iya ɗauka, tare da juzu'in halin yanzu mafi girma fiye da ci gaba da halin yanzu na DC.

PD (mafi girman watsawar wutar lantarki):na'urar zata iya watsar da matsakaicin yawan wutar lantarki.

A taƙaice, ƙarfin ƙofar ƙofar, juriya da sauran sigogi na MOSFET suna da mahimmanci ga aikinta da aikace-aikacen sa, kuma suna buƙatar zaɓi da ƙira bisa takamaiman yanayin aikace-aikacen da buƙatu.