MOSFET Sarudzo Points

Sarudzo yeMOSFETinonyanya kukosha, sarudzo yakaipa inogona kukanganisa kushandiswa kwesimba redunhu rose, tenzi nuances yezvikamu zvakasiyana zveMOSFET uye maparamita mumasekete akasiyana ekuchinja anogona kubatsira mainjiniya kudzivirira matambudziko mazhinji, zvinotevera ndezvimwe zvinokurudzirwa naGuanhua Weiye. yekusarudzwa kweMOSFETs.

Kutanga, P-channel uye N-channel

Danho rekutanga kuona kushandiswa kweN-channel kana P-channel MOSFETs. mumashandisirwo emagetsi, kana MOSFET pasi, uye mutoro wakabatanidzwa kune trunk voltage, iyoMOSFETinoumba low-voltage side switch. Mune yakaderera voltage padivi switch, N-channel MOSFETs anowanzo shandiswa, inova yekufunga nezve voltage inodiwa kudzima kana kubatidza mudziyo. Kana iyo MOSFET yakabatana nebhazi uye pasi pekutakura, yakakwira voltage side switch inoshandiswa. P-channel MOSFETs inowanzo shandiswa, nekuda kweiyo voltage drive kufunga. Kuti usarudze iwo akakodzera zvikamu zvekushandisa, zvakakosha kuona iyo voltage inodiwa kutyaira mudziyo uye kuti zviri nyore sei kuita mukugadzira. Nhanho inotevera ndeyekuona iyo inodiwa voltage rating, kana iyo yakanyanya voltage iyo chikamu chinogona kutakura. Iyo yakakwirira yevoltage rating, inokwira mutengo wemudziyo. Mukuita, chiyero chemagetsi chinofanira kunge chakakura kupfuura trunk kana bhazi voltage. Izvi zvinopa dziviriro yakakwana kuitira kuti MOSFET isakundikane. Pakusarudzwa kweMOSFET, zvakakosha kuti uone huwandu hwemagetsi hunogona kumira kubva pamvura kusvika kune imwe nzvimbo, kureva, iyo yakawanda yeVDS, saka zvakakosha kuziva kuti simba guru iro MOSFET rinogona kumira rinosiyana nekupisa. Vagadziri vanofanirwa kuyedza voltage renji pamusoro pese tembiricha yekushanda. Iyo yakatemerwa voltage inoda kuve neyakaringana margin kuvhara iyi renji kuti ive nechokwadi chekuti dunhu harikundike. Uye zvakare, zvimwe zvinhu zvekuchengetedza zvinoda kutariswa induced voltage transients.

Chechipiri, sarudza chiyero chemazuva ano

Chiyero chazvino cheMOSFET chinoenderana nedunhu redunhu. Chiyero chemazuva ano ndicho chikuru chezvino icho mutoro unogona kumira pasi pemamiriro ose. Zvakafanana nekasi yevoltage, mugadziri anofanirwa kuve nechokwadi chekuti MOSFET yakasarudzwa inokwanisa kutakura iyi yakayerwa ikozvino, kunyangwe iyo system inogadzira spike ikozvino. Iwo maviri azvino mamiriro ekufunga anoenderera modhi uye pulse spikes. iyo MOSFET iri munzvimbo yakatsiga mukuenderera mberi conduction modhi, kana ikozvino ichipfuura ichipfuura nemumudziyo. Pulse spikes inoreva nhamba huru yekusurges (kana spikes of current) inoyerera nemumudziyo, mune iyo nyaya, kana iyo yakanyanya ikozvino yatemerwa, ingori nyaya yekusarudza zvakananga mudziyo unogona kutsungirira iyi yakanyanya ikozvino.

Mushure mekusarudza ikozvino yakarongwa, kurasikirwa kwekufambisa kunoverengwawo. Mune zvimwe zviitiko,MOSFEThaisi zvikamu zvakanaka nekuda kwekurasikirwa kwemagetsi kunoitika panguva yekufambisa, iyo inonzi conduction kurasikirwa. Kana "pa", iyo MOSFET inoita seyakasiyana inopikisa, iyo inotemerwa neiyo RDS (ON) yemudziyo uye inochinja zvakanyanya nekushisa. Iko kurasikirwa kwesimba kwechishandiso kunogona kuverengerwa kubva kuIload2 x RDS (ON), uye sezvo iyo-kupikisa ichisiyana nekupisa, kurasikirwa kwemagetsi kunosiyana. Iyo yakakwirira iyo VGS yakashandiswa kune MOSFET, iyo yakaderera iyo RDS (ON); ukuwo, iyo yakakwirira iyo RDS (ON). Kune sisitimu dhizaini, apa ndipo panopinda tradeoffs zvichienderana neiyo system voltage. Kune anotakurika dhizaini, yakaderera voltages iri nyore (uye yakajairika), nepo kune maindasitiri madhizaini, yakakwirira voltages inogona kushandiswa. Ziva kuti iyo RDS(ON) kuramba inokwira zvishoma neyazvino.

Tekinoroji ine simba rakakura pamaitiro echikamu, uye mamwe matekinoroji anowanzo konzera kuwedzera kweRSS (ON) kana ichiwedzera iyo yakanyanya VDS. Kune matekinoroji akadai, kuwedzera saizi yewafer inodiwa kana VDS neRSS (ON) ichidzikiswa, nekudaro ichiwedzera saizi yepakeji inoenda nayo uye mutengo wekusimudzira unoenderana. Kune akati wandei matekinoroji muindastiri anoedza kudzora kuwedzera kwesaizi yewafer, iyo inonyanya kukosha iyo itekinoroji uye yekuchajisa tekinoroji. Mune tekinoroji tekinoroji, gomba rakadzika rakanyudzwa muwaferi, rinowanzochengeterwa yakaderera voltages, kudzikisa iyo-inopikisa RDS (ON).

III. Sarudza zvinodiwa zvekupisa kupisa

Nhanho inotevera ndeyekuverenga zvinodiwa zvekupisa zvehurongwa. Mamiriro maviri akasiyana anoda kutariswa, iyo yakaipisisa uye iyo chaiyo kesi. TPV inokurudzira kuverenga mhedzisiro yemamiriro ezvinhu akaipisisa, sezvo kuverenga uku kunopa mwero wakakura wekuchengetedza uye kunovimbisa kuti sisitimu haikundike.

IV. Kuchinja Performance

Pakupedzisira, kuchinja kwekuita kweMOSFET. Kune akawanda ma paramita anokanganisa mashandiro ekuchinja, akakosha igedhi / dhiraini, gedhi / sosi uye dhizaini / sosi capacitance. Aya macapacitances anoumba shanduko yekurasikirwa muchikamu nekuda kwekudiwa kwekuvabhadharisa pese pavanenge vachichinja. Nekuda kweizvozvo, kukurumidza kwekuchinja kweMOSFET kunodzikira uye kugona kwemudziyo kunoderera. Kuti uverenge kurasikirwa kwakazara mumudziyo panguva yekuchinja, mugadziri anofanira kuverenga kurasikirwa panguva yekutendeuka (Eon) uye kurasikirwa panguva yekudzima (Eoff). Izvi zvinogona kuratidzwa neinotevera equation: Psw = (Eon + Eoff) x switching frequency. Uye gedhi rekuchaja (Qgd) rine simba guru pakuchinja kuita.