MOSFETE ntoya

Iyo MOSFET ihujwe na bisi hamwe nubutaka, umutwaro muremure wo kuruhande ukoreshwa. Akenshi P-umuyoboroMOSFETSzikoreshwa muri iyi topologiya, na none kubitekerezo bya voltage. Kugena igipimo kiriho Intambwe ya kabiri ni uguhitamo igipimo cyubu cya MOSFET. Ukurikije imiterere yumuzunguruko, uru rutonde rugomba kuba urwego ntarengwa umutwaro ushobora kwihanganira mubihe byose.

Bisa nikibazo cya voltage, uwashizeho agomba kwemeza ko abatoranijweBYINSHIIrashobora kwihanganira iki gipimo kigezweho, niyo sisitemu itanga imigozi ya spike. Imanza ebyiri zubu zasuzumwe nuburyo bukomeza hamwe na pulse spike. Iyi parameter yerekanwe na DATASHEET ya FDN304P, aho MOSFET ihagaze neza muburyo bwo gukomeza gutwara, mugihe ikigezweho gikomeza kunyura mubikoresho.

Imitsi ya pulse ni mugihe hari umuvuduko munini (cyangwa spike) yumuyaga unyura mubikoresho. Iyo imiyoboro ntarengwa iri muri ibi bihe imaze kugenwa, ni ikibazo cyo guhitamo igikoresho gishobora kwihanganira iyi miyoboro ntarengwa.

Nyuma yo guhitamo ibipimo byagenwe, igihombo cyo gutwara nacyo kigomba kubarwa. Mubimenyerezo, MOSFETs ntabwo ari ibikoresho byiza kuko habaho gutakaza imbaraga mugihe cyimikorere, aribyo gutakaza igihombo.

MOSFET ikora nka résistoriste ihinduka iyo ari "kuri", nkuko byagenwe na RDS (ON) yigikoresho, kandi biratandukanye cyane nubushyuhe. Gukwirakwiza ingufu z'igikoresho birashobora kubarwa kuva Iload2 x RDS (ON), kandi kubera ko kurwanywa bigenda bitandukana n'ubushyuhe, ikwirakwizwa ry'amashanyarazi riratandukanye. Iyo hejuru ya voltage VGS ikoreshwa kuri MOSFET, ntoya RDS (ON) izaba nto; muburyo buhanitse RDS (ON) izaba. Kubushakashatsi bwa sisitemu, aha niho hacururizwa ibicuruzwa bitewe na voltage ya sisitemu. Kubishushanyo mbonera, biroroshye (kandi nibisanzwe) gukoresha voltage yo hasi, mugihe kubishushanyo mbonera byinganda, imbaraga zishobora gukoreshwa.

Menya ko kurwanya RDS (ON) kuzamuka gato hamwe nubu. Guhindagurika kubintu bitandukanye byamashanyarazi ya RDS (ON) murwanya urashobora kubisanga mumpapuro zubuhanga zitangwa nuwabikoze.

Kugena Ibisabwa Ubushyuhe Intambwe ikurikira muguhitamo MOSFET ni ukubara ubushyuhe bukenewe bwa sisitemu. Ibishushanyo mbonera bigomba gusuzuma ibintu bibiri bitandukanye, urubanza rubi nukuri. Birasabwa ko kubara kubintu bibi cyane byakoreshwa, kuko iki gisubizo gitanga intera nini yumutekano kandi ikemeza ko sisitemu itazatsindwa.

Hariho kandi ibipimo bimwe na bimwe ugomba kumenya kuriBYINSHIurupapuro rwerekana; nkubushyuhe bwumuriro hagati ya semiconductor ihuza ibikoresho bipakiye hamwe nibidukikije, hamwe nubushyuhe ntarengwa. Ubushyuhe bwihuza bwibikoresho bingana nubushyuhe ntarengwa bwibidukikije hiyongereyeho ibicuruzwa byo kurwanya ubushyuhe no gukwirakwiza ingufu (ubushyuhe bwihuza = ubushyuhe bw’ibidukikije + + Uhereye kuri iri gereranya imbaraga ntarengwa zo gukwirakwiza sisitemu zirashobora gukemurwa, ni mubisobanuro bingana na I2 x RDS (ON).

Kuva uwashizeho igenamigambi ntarengwa rizanyura mu gikoresho, RDS (ON) irashobora kubarwa kubushyuhe butandukanye. Ni ngombwa kumenya ko mugihe ukorana nuburyo bworoshye bwubushyuhe, uwashizeho ibishushanyo agomba no gutekereza kubushyuhe bwubushyuhe bwa semiconductor ihuza / igikoresho gikikijwe hamwe nuruzitiro / ibidukikije; ni ukuvuga, birasabwa ko ikibaho cyumuzingo cyacapwe hamwe na paki bidashyuha ako kanya.

Mubisanzwe, PMOSFET, hazabaho diode ya parasitike ihari, imikorere ya diode nugukumira inkomoko-imiyoboro ihinduka, kuri PMOS, akarusho kurenza NMOS nuko voltage yayo ishobora kuba 0, kandi itandukaniro rya voltage hagati ya Umuvuduko wa DS ntabwo ari mwinshi, mugihe NMOS kumiterere isaba ko VGS iruta urwego, ibyo bizaganisha kuri voltage yo kugenzura byanze bikunze iruta ingufu zisabwa, kandi hazabaho ibibazo bitari ngombwa. PMOS yatoranijwe nkuburyo bwo kugenzura, hari porogaramu ebyiri zikurikira: porogaramu ya mbere, PMOS kugirango ikore ihitamo rya voltage, mugihe V8V ibaho, hanyuma voltage yose itangwa na V8V, PMOS izimya, VBAT ntabwo itanga voltage kuri VSIN, kandi iyo V8V iri hasi, VSIN ikoreshwa na 8V. Reba aho R120 ihagaze, rezistor ikurura gahoro gahoro amarembo kugirango ihindure PMOS ikwiye, impanuka ya leta ijyanye no kutambuka amarembo maremare yasobanuwe mbere.

Imikorere ya D9 na D10 nugukumira voltage gusubira inyuma, kandi D9 irashobora kuvaho. Twabibutsa ko DS yumuzunguruko isubizwa inyuma, kugirango imikorere yumuyoboro idashobora kugerwaho nogutwara diode ifatanye, igomba kugaragara mubikorwa bifatika. Muri uyu muzunguruko, ikimenyetso cyo kugenzura PGC igenzura niba V4.2 itanga ingufu kuri P_GPRS. Uyu muzunguruko, inkomoko hamwe nuyoboro wamazi ntaho bihuriye nibinyuranye, R110 na R113 birahari muburyo R110 igenzura irembo rinini ntabwo ari rinini cyane, R113 igenzura irembo risanzwe, R113 gukuramo hejuru, nka PMOS, ariko kandi Birashobora kugaragara nko gukurura ikimenyetso cyo kugenzura, mugihe MCU yimbere imbere no gukurura, ni ukuvuga, ibisohoka byafunguye-imiyoboro iyo ibisohoka bidatwaye PMOS, muriki gihe, Bizabikora bikenewe umuyagankuba wo hanze kugirango utange gukurura, rezistor R113 ikina imirimo ibiri. r110 irashobora kuba nto, kugeza 100 oms irashobora kuba.