Ukukhethwa kwedivayisi ye-MOSFET ukuze kucatshangelwe zonke izici zezici, kusukela kokuncane ukuya kokukhetha uhlobo lwe-N noma uhlobo lwe-P, uhlobo lwephakheji, olukhulu ukuya ku-voltage ye-MOSFET, ukumelana nokumelana, njll., izidingo zohlelo lokusebenza ziyahlukahluka.Isihloko esilandelayo sifingqa ukukhethwa kwedivayisi ye-MOSFET yemithetho emikhulu engu-3, ngikholelwa ukuthi ngemva kokufunda uzoba nokuningi.
1. Isinyathelo sokuqala sokukhetha i-MOSFET: I-P-tube, noma i-N-tube?
Kunezinhlobo ezimbili zamandla ama-MOSFETs: I-N-channel ne-P-channel, ohlelweni lokuklanywa kwesistimu ukukhetha i-N-tube noma i-P-tube, kuhlelo lokusebenza lwangempela ongalukhetha, ama-MOSFET we-N-channel ukukhetha imodeli, izindleko eziphansi;P-channel MOSFETs ukukhetha imodeli kancane, izindleko eziphezulu.
Uma i-voltage ekuxhumekeni kwe-S-pole yamandla we-MOSFET ingeyona inkomba yesistimu, isiteshi se-N sidinga idrayivu yokuphakelwa kwamandla ephansi elintantayo, idrayivu ye-transformer noma idrayivu ye-bootstrap, inkimbinkimbi yesekethe yedrayivu;Isiteshi se-P singashayelwa ngokuqondile, shayela kalula.
Isidingo sokucabangela izinhlelo zokusebenza ze-N-channel kanye ne-P-channel ikakhulukazi
a.Amakhompiyutha ezincwadi zamanothi, amadeskithophu kanye namaseva asetshenziselwa ukunikeza i-CPU nesistimu yokupholisa ifeni, i-printer feeding system motor drive, vacuum cleaners, izinto zokuhlanza umoya, amafeni kagesi nezinye izinto zikagesi zasendlini, lezi zinhlelo zisebenzisa isakhiwo sesekhethi esigcwele ibhuloho, ingalo ngayinye yebhuloho. ku-tube ingasebenzisa i-P-tube, ingasebenzisa ne-N-tube.
b.Isistimu yokuxhumana engu-48V yesistimu yokufaka yama-hot-plug MOSFET abekwe ekugcineni okuphezulu, ungasebenzisa amashubhu we-P, ungasebenzisa futhi amashubhu e-N.
c.Isekhethi yokufaka yekhompyutha yenothibhukhi ochungechungeni, idlala indima yokuxhumanisa okuphambene nokuhlehla nokulayisha ukuguqula amandla ama-MOSFET amabili abuyela emuva, ukusetshenziswa kwe-N-channel kudingeka ukulawula iphampu yokushaja yangaphakathi ye-chip edidiyelwe, ukusetshenziswa kwesiteshi se-P. ingashayelwa ngokuqondile.
2. Ukukhethwa kohlobo lwephakheji
Amandla ohlobo lwesiteshi se-MOSFET ukuze anqume isinyathelo sesibili sokunquma iphakheji, izimiso zokukhetha iphakheji.
a.Ukukhuphuka kwezinga lokushisa kanye nokwakheka okushisayo kuyizidingo eziyisisekelo zokukhetha iphakheji
Amasayizi amaphakheji ahlukene anokumelana nokushisa okuhlukile kanye nokuchithwa kwamandla, ngaphezu kokucabangela izimo ezishisayo zesistimu kanye nezinga lokushisa elizungezile, njengokuthi ingabe kukhona ukupholisa komoya, ukuma kokushisa kokushisa kanye nemikhawulo yosayizi, noma ngabe imvelo ivaliwe kanye nezinye izici, umgomo oyisisekelo uwukuqinisekisa ukukhuphuka kwezinga lokushisa kwamandla e-MOSFET nokusebenza kahle kwesistimu, isisekelo sokukhetha amapharamitha kanye nokupakisha amandla ajwayelekile e-MOSFET.
Kwesinye isikhathi ngenxa yezinye izimo, isidingo sokusebenzisa ama-MOSFET amaningi ahambisanayo ukuze kuxazululwe inkinga yokushabalaliswa kokushisa, njengasezinhlelweni ze-PFC, izilawuli zezimoto zikagesi, izinhlelo zokuxhumana, njengemojula yezinhlelo zokusebenza zokulungiswa kwe-synchronous yesibili yokuphakelwa kwamandla kagesi. ihambisana namashubhu amaningi.
Uma uxhumano lwe-multi-tube parallel lungakwazi ukusetshenziswa, ngaphezu kokukhetha i-MOSFET yamandla esebenza kangcono, ngaphezu kwalokho, iphakheji yesayizi enkulu noma uhlobo olusha lwephakheji ingasetshenziswa, isibonelo, kwezinye izinto zamandla ze-AC/DC TO220 zizosebenza. iguqulwe ibe yiphakheji ye-TO247;kwezinye izinto zogesi zesistimu yokuxhumana, iphakheji entsha ye-DFN8*8 isetshenziswa.
b.Umkhawulo kasayizi wesistimu
Ezinye izinhlelo ze-elekthronikhi zinqunyelwe ubukhulu be-PCB nokuphakama kwendawo yangaphakathi, njengamandla we-module wezinhlelo zokuxhumana ngenxa yokuphakama kwemikhawulo ngokuvamile zisebenzisa i-DFN5 * 6, DFN3 * 3 iphakheji;kokunye ukunikezwa kwamandla kwe-ACDC, ukusetshenziswa komklamo omncane kakhulu noma ngenxa yemikhawulo yegobolondo, ukuhlanganisa amandla wephakheji we-TO220 we-MOSFET izikhonkwane ngqo impande, ukuphakama kwemikhawulo akukwazi ukusebenzisa iphakheji ye-TO247.
Omunye umklamo ozacile kakhulu ugoba ngokuqondile izikhonkwane zedivayisi, le nqubo yokukhiqiza yomklamo izoba yinkimbinkimbi.
Eklanyweni yebhodi yokuvikela ibhethri ye-lithium enamandla amakhulu, ngenxa yemikhawulo kasayizi enokhahlo, iningi manje lisebenzisa iphakheji ye-CSP yezinga le-chip ukuze lithuthukise ukusebenza okushisayo ngangokunokwenzeka, kuyilapho liqinisekisa usayizi omncane kakhulu.
c.Ukulawula izindleko
Amasistimu amaningi e-elekthronikhi asebenzisa iphakethe le-plug-in, kule minyaka ngenxa yokwenyuka kwezindleko zabasebenzi, izinkampani eziningi zaqala ukushintshela kuphakheji ye-SMD, nakuba izindleko zokushisela ze-SMD kune-plug-in high, kodwa izinga eliphezulu lokuzenzekelayo kwe-SMD welding, izindleko zizonke zisengalawulwa ngebanga elifanele.Kwezinye izinhlelo zokusebenza ezinjengamabhodi omama wedeskithophu namabhodi azwela kakhulu izindleko, ama-MOSFET wamandla kumaphakheji e-DPAK avame ukusetshenziswa ngenxa yezindleko eziphansi zale phakheji.
Ngakho-ke, ekukhetheni amandla iphakheji MOSFET, ukuhlanganisa isitayela inkampani yabo kanye nezici umkhiqizo, kucatshangelwa izici ezingenhla.
3. Khetha i-RDSON yokumelana nesimo, qaphela: hhayi okwamanje
Izikhathi eziningi onjiniyela bakhathazekile nge-RDSON, ngoba i-RDSON kanye nokulahlekelwa kwe-conduction kuhlobene ngokuqondile, i-RDSON encane, ukulahleka kwamandla kwe-MOSFET kuncane, ukusebenza kahle okuphezulu, ukwehla kwezinga lokushisa.
Ngokufanayo, onjiniyela ngangokunokwenzeka ukulandela iphrojekthi yangaphambilini noma izingxenye ezikhona kulabhulali yezinto ezibonakalayo, ngoba i-RDSON yendlela yokukhetha yangempela ayinakho okuningi okufanele icatshangelwe.Uma ukukhuphuka kwezinga lokushisa kwamandla akhethiwe i-MOSFET iphansi kakhulu, ngenxa yezizathu zezindleko, izoshintshela kuzingxenye ezinkulu ze-RDSON;lapho ukukhuphuka kwezinga lokushisa kwamandla e-MOSFET kuphezulu kakhulu, ukusebenza kahle kwesistimu kuphansi, kuzoshintshela ezingxenyeni ezincane ze-RDSON, noma ngokuthuthukisa isekethe yedrayivu yangaphandle, kuthuthukiswe indlela yokulungisa ukuchithwa kokushisa, njll.
Uma kuyiphrojekthi entsha sha, ayikho iphrojekthi yangaphambilini okufanele ilandelwe, ungakhetha kanjani amandla e-MOSFET RDSON?Nansi indlela yokwethula kuwe: indlela yokusabalalisa ukusetshenziswa kwamandla.
Lapho uklama uhlelo lokuphakela amandla, izimo ezaziwayo yilezi: uhla lwe-voltage yokufaka, i-voltage ephumayo / yamanje ephumayo, ukusebenza kahle, imvamisa yokusebenza, i-drive voltage, yiqiniso, kunezinye izinkomba zobuchwepheshe namandla ama-MOSFET ahlobene ikakhulukazi nalezi zinhlaka.Izinyathelo zimi kanje.
a.Ngokusho kobubanzi be-voltage yokufaka, i-voltage ephumayo / yamanje ephumayo, ukusebenza kahle, ukubala ukulahlekelwa okukhulu kohlelo.
b.Ukulahleka okungamanga kwesekethe yamandla, ukulahleka okumile kwezingxenye zesekethe okungewona wamandla, ukulahleka okumile kwe-IC kanye nokulahlekelwa kwe-drive, ukwenza isilinganiso esinzima, inani elibonakalayo lingabalelwa ku-10% kuya ku-15% wakho konke ukulahlekelwa.
Uma isekethe yamandla inesitha samanje sesampula, bala ukusetshenziswa kwamandla kwesimelaphi samasampula samanje.Ukulahlekelwa okuphelele kususe lokhu kulahlekelwa ngenhla, ingxenye esele idivayisi yamandla, i-transformer noma ukulahlekelwa kwamandla e-inductor.
Ukulahlekelwa kwamandla okusele kuzokwabelwa idivayisi yamandla kanye ne-transformer noma i-inductor ngengxenye ethile, futhi uma ungaqiniseki, ukusabalalisa okumaphakathi ngenani lezingxenye, ukuze uthole ukulahlekelwa kwamandla we-MOSFET ngayinye.
c.Ukulahlekelwa kwamandla e-MOSFET kwabelwa ekulahlekeni kokushintsha kanye nokulahlekelwa kokwenziwa ngengxenye ethile, futhi uma kungaqinisekiswa, ukulahlekelwa kokushintsha nokulahlekelwa kokwenziwa kwabiwa ngokulinganayo.
d.Ngokulahleka kokuqhuba kwe-MOSFET kanye nokugeleza kwamanje kwe-RMS, bala isilinganiso esiphezulu esivumelekile sokumelana nokuqhuba, lokhu kumelana kuyi-MOSFET ezingeni eliphezulu lokushisa le-RMS lokusebenza.
Ishidi ledatha emandleni I-MOSFET RDSON ephawulwe ngezimo zokuhlola ezichaziwe, ezimweni ezichaziwe ezihlukene zinamanani ahlukene, izinga lokushisa lokuhlola: TJ = 25 ℃, i-RDSON ine-coefficient yokushisa ephozithivu, ngakho-ke ngokuya ngezinga lokushisa eliphakeme kakhulu le-junction yokusebenza ye-MOSFET futhi I-coefficient yethempelesha ye-RDSON, ukusuka enanini elibaliwe le-RDSON elingenhla, ukuze uthole i-RDSON ehambisanayo kuzinga lokushisa elingu-25 ℃.
e.I-RDSON kusuka ku-25 ℃ ukuze ukhethe uhlobo olufanele lwamandla e-MOSFET, ngokuya ngamapharamitha wangempela we-MOSFET RDSON, ukusika phansi noma phezulu.
Ngezinyathelo ezingenhla, ukukhethwa kokuqala kwemodeli yamandla ye-MOSFET namapharamitha e-RDSON.
Lesi sihloko sicashunwe kunethiwekhi, sicela usithinte ukuze ususe ukuphulwa, siyabonga!
I-Zhejiang NeoDen Technology Co., Ltd. ibikhiqiza futhi ithumela kwamanye amazwe imishini emincane yokukhetha nendawo kusukela ngo-2010. Isebenzisa i-R&D yethu ecebile enokuhlangenwe nakho, ukukhiqizwa okuqeqeshwe kahle, i-NeoDen izuza idumela elihle kumakhasimende omhlaba wonke.
Njengoba kukhona emhlabeni wonke emazweni angaphezu kwe-130, ukusebenza okuhle kakhulu, ukunemba okuphezulu nokuthembeka kwemishini ye-NeoDen PNP kuyenza ifanelekele i-R&D, i-prototyping yobungcweti kanye nokukhiqizwa kwenqwaba encane kuya kwemaphakathi.Sihlinzeka ngesixazululo sochwepheshe semishini yokumisa eyodwa ye-SMT.
Engeza: No.18, Tianzihu Avenue, Tianzihu Town, Anji County, Huzhou City, Zhejiang Province, China
Ucingo: 86-571-26266266
Isikhathi sokuthumela: Apr-19-2022