Amabwiriza yo gutoranya MOSFET

Icya kabiri, ingano ya sisitemu igarukira

Sisitemu zimwe za elegitoronike zigarukira ku bunini bwa PCB n'imbere uburebure, such nka sisitemu yitumanaho, amashanyarazi yubusa bitewe nuburebure buringaniye ukoreshe DFN5 * 6, DFN3 * 3 pack; mumashanyarazi amwe n'amwe ya ACDC, gukoresha igishushanyo mbonera cya ultra-thin cyangwa kubera imbogamizi z'igikonoshwa, inteko ya TO220 yamashanyarazi ya MOSFET yimbaraga zinjijwe mumuzi yuburebure bwuburebure ntishobora gukoresha pake ya TO247. Igishushanyo mbonera cya ultra-thin igoramye igipande cyibikoresho, iki gishushanyo mbonera kizaba ingorabahizi.

Icya gatatu, inzira yikigo

TO220 ifite ubwoko bubiri bwa paki: ipaki yicyuma yambaye ubusa hamwe nububiko bwuzuye bwa pulasitike, icyuma cyambaye ubusa cyuzuye ubushyuhe bwumuriro ni gito, ubushobozi bwo gukwirakwiza ubushyuhe burakomeye, ariko mugikorwa cyo kubyaza umusaruro, ugomba kongeramo igitonyanga, uburyo bwo gukora buragoye kandi buhenze, mugihe paki yuzuye ya plastike irwanya ubushyuhe nini, ubushobozi bwo gukwirakwiza ubushyuhe ni ntege, ariko inzira yo kubyara iroroshye.

Kugirango ugabanye inzira yubukorikori yo gufunga imigozi, mumyaka yashize, sisitemu zimwe za elegitoronike zikoresha clips kumashanyaraziMOSFETS yometse ku cyuma gishyuha, ku buryo hagaragaye igice gakondo cya TO220 igice cyo hejuru cyo gukuraho ibyobo muburyo bushya bwo gufunga, ariko kandi kugirango bigabanye uburebure bwigikoresho.

Icya kane, kugenzura ibiciro

Mubikorwa bimwe-byigiciro cyane-nkibikoresho nkibiro bya desktop na kibaho, imbaraga MOSFETs mubipaki ya DPAK mubisanzwe bikoreshwa kubera igiciro gito cyibikoresho. Kubwibyo, mugihe uhisemo imbaraga MOSFET yamashanyarazi, ihujwe nuburyo bwa sosiyete yabo nibiranga ibicuruzwa, hanyuma urebe ibintu byavuzwe haruguru.

Icya gatanu, hitamo kwihanganira voltage BVDSS mubihe byinshi, kuko igishushanyo cyinjiza voltage ya elegitoroniki sisitemu irakosowe neza, isosiyete yahisemo gutanga isoko ryihariye rya numero yibikoresho, ibicuruzwa byapimwe voltage nayo irashizweho.

Kumenagura voltage BVDSS yimbaraga MOSFETs muri datasheet yasobanuye imiterere yikizamini, hamwe nagaciro kinyuranye mubihe bitandukanye, kandi BVDSS ifite coeffisente yubushyuhe bwiza, mubikorwa nyabyo byo guhuza ibyo bintu bigomba gutekerezwa muburyo bwuzuye.

Amakuru menshi nubuvanganzo bikunze kuvugwa: niba sisitemu yimbaraga MOSFET VDS yumuvuduko mwinshi wa spike niba irenze BVDSS, kabone niyo spike pulse voltage yamara ya bake cyangwa mirongo ya ns gusa, imbaraga MOSFET izinjira muri avalanche bityo ibyangiritse bikabaho.

Bitandukanye na tristoriste na IGBT, ingufu MOSFETs zifite ubushobozi bwo kurwanya inkangu, kandi amasosiyete manini menshi ya semiconductor akoresha ingufu za MOSFET avalanche ingufu mumurongo wibikorwa ni ubugenzuzi bwuzuye, gutahura 100%, ni ukuvuga, mumibare ibi nibipimo byemewe, voltage ya avalanche mubisanzwe bibaho inshuro 1,2 ~ 1,3 inshuro ya BVDSS, kandi igihe cyigihe ni μs, ndetse ms urwego, hanyuma igihe cyigihe gito cyangwa icumi cya ns, kiri munsi cyane ugereranije umuyaga wa avalanche voltage spike pulse voltage ntabwo yangiza imbaraga MOSFET.

Gatandatu, ukoresheje disiki ya voltage ihitamo VTH

Sisitemu zitandukanye za elegitoronike zingufu MOSFETs zatoranijwe zikoreshwa mumashanyarazi ntago arimwe, amashanyarazi ya AC / DC mubisanzwe akoresha voltage ya 12V ya disiki, ikibaho cyababyeyi ikayi ya DC / DC ikoresha voltage ya 5V, bityo rero ukurikije amashanyarazi ya sisitemu kugirango uhitemo voltage itandukanye. VTH power MOSFETs.

Imbaraga zingana na VTH yimbaraga MOSFETs muri datasheet nayo yasobanuye imiterere yikizamini kandi ifite indangagaciro zitandukanye mubihe bitandukanye, kandi VTH ifite coeffisente yubushyuhe bubi. Imashanyarazi itandukanye ya VGS ihuye nuburyo butandukanye, kandi mubikorwa bifatika ni ngombwa kuzirikana ubushyuhe

Mubikorwa bifatika, itandukaniro ryubushyuhe rigomba kwitabwaho kugirango ingufu MOSFET ifungurwe byuzuye, mugihe kimwe no kwemeza ko impiswi ya spike ihujwe na G-pole mugihe cyo guhagarika itazaterwa no gukurura ibinyoma kuri kubyara inzira igororotse cyangwa igufi.