Binciken muhimman abubuwan da ke haifar da samar da zafi na MOSFET

Nau'in N, nau'in P nau'in MOSFET ainihin aiki iri ɗaya ne, MOSFET galibi ana ƙara shi zuwa ɓangaren shigar da wutar lantarkin ƙofar don samun nasarar sarrafa sashin fitarwa na magudanar yanzu, MOSFET na'urar sarrafa wutar lantarki ne, ta hanyar ƙarfin lantarki da aka ƙara. zuwa ƙofa don sarrafa halayen na'urar, sabanin triode don yin lokacin sauyawa saboda tushen halin yanzu da tasirin cajin caji ya haifar, a cikin sauya aikace-aikacen, MOSFET's A cikin sauya aikace-aikacen,MOSFET saurin sauyawa yana da sauri fiye da na triode.

A cikin wutar lantarki mai sauyawa, MOSFET bude magudanar ruwa da aka saba amfani da shi, ana haɗa magudanar da kaya kamar yadda ake kira buɗaɗɗen ruwa, buɗaɗɗen magudanar ruwa, ana haɗa nauyin da girman ƙarfin lantarki, yana iya kunnawa, kashe wutar lantarki. Load current, shine na'urar sauyawa ta analog mai kyau, wanda shine ka'idar MOSFET don yin na'urori masu sauyawa, MOSFET don yin sauyawa a cikin nau'ikan ƙarin da'irori.

Dangane da sauya aikace-aikacen samar da wutar lantarki, wannan aikace-aikacen yana buƙata MOSFETs don gudanar da aiki lokaci-lokaci, kashewa, kamar wutar lantarki ta DC-DC da aka saba amfani da ita a cikin ainihin buck Converter yana dogara da MOSFET guda biyu don aiwatar da aikin sauyawa, waɗannan suna canzawa a madadin inductor don adana makamashi, sakin makamashi zuwa kaya, sau da yawa zaɓi. ɗaruruwan kHz ko ma fiye da 1 MHz, musamman saboda girman mitar sannan, ƙananan abubuwan maganadisu. A lokacin aiki na yau da kullun, MOSFET daidai yake da jagora, alal misali, MOSFETs masu ƙarfi, MOSFET masu ƙaramin ƙarfi, da'irori, samar da wutar lantarki shine mafi ƙarancin asarar gudanarwa na MOS.

MOSFET PDF sigogi, masana'antun MOSFET sun sami nasarar karɓar ma'aunin RDS (ON) don ayyana rashin ƙarfi na kan-jihar, don sauya aikace-aikacen, RDS (ON) shine mafi mahimmancin halayen na'urar; daftarin bayanai sun ayyana RDS (ON), ƙofa (ko tuƙi) ƙarfin lantarki VGS da halin yanzu da ke gudana ta wurin sauyawa suna da alaƙa, don isassun tukin ƙofa, RDS (ON) ma'auni ne a tsaye; MOSFETs da suka kasance a cikin gudanarwa suna da sauƙi ga samar da zafi, kuma sannu a hankali ƙara yawan yanayin zafi zai iya haifar da karuwa a RDS (ON);MOSFET takaddun bayanai sun ƙididdige ma'auni na thermal impedance, wanda aka ayyana azaman ikon mahaɗar semiconductor na kunshin MOSFET don watsar da zafi, kuma RθJC an ayyana shi azaman junction-to-case thermal impedance.

1, mita yana da yawa, wani lokacin akan bin ƙarar, kai tsaye zai haifar da babban mita, MOSFET akan hasara yana ƙaruwa, mafi girma zafi, kada ku yi aiki mai kyau na ƙirar ƙira mai zafi, babban halin yanzu, maras kyau. darajar MOSFET na yanzu, buƙatar buƙatar zafi mai kyau don samun damar cimma; ID bai kai matsakaicin halin yanzu, yana iya zama zafi mai tsanani, buƙatar isassun heatsinks na taimako.

2, Kuskuren zaɓi na MOSFET da kurakurai a cikin hukuncin iko, MOSFET juriya na ciki ba a cika la'akari da shi ba, zai haifar da haɓaka haɓakar haɓaka kai tsaye, yayin da ake magance matsalolin dumama MOSFET.

3, saboda matsalolin ƙirar da'ira, wanda ke haifar da zafi, ta yadda MOSFET ta yi aiki a cikin yanayin aiki na layi, ba a cikin yanayin canzawa ba, wanda shine dalilin da ya sa MOSFET dumama, misali, N-MOS yi sauyawa, G- matakin ƙarfin lantarki ya zama mafi girma fiye da samar da wutar lantarki ta 'yan V, don samun damar yin aiki cikakke, P-MOS ya bambanta; idan babu cikakken buɗewa, raguwar wutar lantarki ya yi girma sosai, wanda zai haifar da amfani da wutar lantarki, daidaitaccen ƙarfin DC ya fi girma, raguwar ƙarfin lantarki kuma zai karu, U * Ni kuma zan ƙara, asarar zai haifar da zafi.