Kusankha kwa chipangizo cha MOSFET kuganizira mbali zonse za zinthu, kuyambira zazing'ono kusankha mtundu wa N kapena P, mtundu wa phukusi, lalikulu mpaka MOSFET voteji, kukana, etc., zofunikira zosiyanasiyana zogwiritsira ntchito zimasiyana.Nkhani yotsatirayi ikufotokoza mwachidule za MOSFET chipangizo chosankhidwa cha malamulo akuluakulu a 3, ndikukhulupirira kuti mutatha kuwerenga mudzakhala ndi zambiri.
1. Mphamvu MOSFET kusankha sitepe 1: P-chubu, kapena N-chubu?
Pali mitundu iwiri ya mphamvu MOSFETs: N-channel ndi P-channel, mu ndondomeko kamangidwe kachitidwe kusankha N-chubu kapena P-chubu, ku ntchito yeniyeni kusankha, N-channel MOSFETs kusankha chitsanzo, mtengo wotsika;P-channel MOSFETs kusankha chitsanzo zochepa, mtengo wapamwamba.
Ngati voteji pa S-pole kugwirizana kwa mphamvu MOSFET si malo ofotokoza za dongosolo, N-channel amafuna zoyandama pansi magetsi galimoto, thiransifoma pagalimoto kapena bootstrap pagalimoto, galimoto dera zovuta;P-channel imatha kuyendetsedwa mwachindunji, kuyendetsa mosavuta.
Muyenera kuganizira za N-channel ndi P-channel ntchito makamaka
a.Makompyuta apakompyuta, ma desktops ndi maseva omwe amagwiritsidwa ntchito kupatsa CPU ndi makina oziziritsa kuzizira, makina osindikizira oyendetsa galimoto, zotsukira, zotsuka mpweya, mafani amagetsi ndi zida zina zapanyumba zowongolera ma motor, makinawa amagwiritsa ntchito mawonekedwe ozungulira mlatho wathunthu, mkono uliwonse wa mlatho. pa chubu amatha kugwiritsa ntchito P-chubu, amathanso kugwiritsa ntchito N-chubu.
b.Njira yolumikizirana 48V yolowetsamo ma MOSFET otenthetsera oyikidwa kumapeto, mutha kugwiritsa ntchito ma P-chubu, mutha kugwiritsanso ntchito ma N-chubu.
c.Notebook kompyuta athandizira dera mu mndandanda, kusewera udindo wa odana n'zosiyana kugwirizana ndi katundu kusintha awiri kumbuyo ndi kumbuyo mphamvu MOSFETs, ntchito N-channel ayenera kulamulira Chip mkati Integrated pagalimoto mlandu mpope, ntchito P-channel. ikhoza kuyendetsedwa mwachindunji.
2. Kusankha mtundu wa phukusi
Mphamvu yamtundu wa MOSFET njira kuti mudziwe gawo lachiwiri kuti mudziwe phukusi, mfundo zosankhidwa ndi phukusi.
a.Kukwera kwa kutentha ndi kapangidwe ka kutentha ndizofunikira kwambiri pakusankha phukusi
Zosiyanasiyana phukusi kukula ndi kukana matenthedwe ndi kutha mphamvu, kuwonjezera kuganizira zinthu matenthedwe dongosolo ndi kutentha yozungulira, monga ngati pali mpweya kuzirala, kutentha lakuya mawonekedwe ndi zoletsa kukula, kaya chilengedwe chatsekedwa ndi zinthu zina, mfundo yofunika ndi kuonetsetsa kutentha kukwera kwa mphamvu MOSFET ndi mphamvu dongosolo, maziko a kusankha magawo ndi phukusi mphamvu zambiri MOSFET.
Nthawi zina chifukwa cha zikhalidwe zina, kufunikira kogwiritsa ntchito ma MOSFET angapo mogwirizana kuti athetse vuto la kutentha kwapang'onopang'ono, monga mapulogalamu a PFC, owongolera magalimoto amagetsi, makina olumikizirana, monga gawo lamagetsi lamagetsi lachiwiri, amasankhidwa mu. kufanana ndi machubu angapo.
Ngati kugwirizana kofanana kwa machubu ambiri sikungagwiritsidwe ntchito, kuwonjezera pa kusankha MOSFET yamagetsi ndi ntchito yabwino, kuwonjezera pake, phukusi lalikulu la kukula kapena mtundu watsopano wa phukusi lingagwiritsidwe ntchito, mwachitsanzo, muzinthu zina za AC / DC TO220. kusinthidwa kukhala TO247 phukusi;muzinthu zina zamagetsi zamagetsi, phukusi latsopano la DFN8 * 8 likugwiritsidwa ntchito.
b.Kuchepetsa kukula kwa dongosolo
machitidwe ena amagetsi ndi malire kukula kwa PCB ndi kutalika kwa mkati, monga gawo mphamvu ya kachitidwe kulankhulana chifukwa cha kutalika kwa zoletsa zambiri ntchito DFN5 * 6, DFN3 * 3 phukusi;ena ACDC magetsi, ntchito kopitilira muyeso-woonda kapangidwe kapena chifukwa cha zofooka za chipolopolo, msonkhano TO220 phukusi mphamvu MOSFET zikhomo mwachindunji muzu, kutalika kwa zoletsa sangathe ntchito TO247 phukusi.
Mapangidwe ena owonda kwambiri amapindika mwachindunji zikhomo za chipangizocho, kupanga mapangidwe awa kumakhala kovuta.
M'mapangidwe a bolodi lalikulu lachitetezo cha batri la lithiamu, chifukwa choletsa kukula koopsa, ambiri tsopano amagwiritsa ntchito phukusi la CSP chip kuti apititse patsogolo magwiridwe antchito momwe angathere, ndikuwonetsetsa kukula kocheperako.
c.Kuwongolera mtengo
Kachitidwe kamagetsi koyambirira kogwiritsa ntchito plug-in phukusi, zaka izi chifukwa cha kuchuluka kwa ndalama zogwirira ntchito, makampani ambiri adayamba kusinthana ndi phukusi la SMD, ngakhale mtengo wowotcherera wa SMD kuposa pulagi-mu mkulu, koma kuchuluka kwa zodziwikiratu za SMD kuwotcherera, mtengo wonse ukhoza kulamuliridwabe pamlingo woyenera.M'mapulogalamu ena monga ma boardboard apakompyuta ndi ma board omwe amakhala otsika mtengo kwambiri, ma MOSFET amphamvu m'maphukusi a DPAK amagwiritsidwa ntchito chifukwa cha mtengo wotsika wa phukusili.
Choncho, posankha mphamvu MOSFET phukusi, kuphatikiza awo kalembedwe kampani ndi mankhwala mbali, poganizira zinthu pamwamba.
3. Sankhani RDSON yolimbana ndi boma, zindikirani: osati pano
Nthawi zambiri mainjiniya amakhudzidwa ndi RDSON, chifukwa RDSON ndi kutayika kwa conduction kumakhudzana mwachindunji, kucheperako kwa RDSON, kucheperako kwa mphamvu ya MOSFET kutayika, kumapangitsa kuti magwiridwe antchito azitha, kutsika kwa kutentha.
Mofananamo, mainjiniya momwe angathere kuti atsatire pulojekiti yapitayi kapena zigawo zomwe zilipo mulaibulale yazinthu, chifukwa RDSON ya njira yeniyeni yosankha ilibe zambiri zoti muganizire.Pamene kutentha kwa kutentha kwa mphamvu yosankhidwa MOSFET ndi yotsika kwambiri, pazifukwa zamtengo wapatali, idzasinthira ku zigawo zazikulu za RDSON;Kutentha kwamphamvu kwa MOSFET kukakhala kokwera kwambiri, magwiridwe antchito amatsika, amasinthira ku zigawo zing'onozing'ono za RDSON, kapena kukhathamiritsa dera lakunja lagalimoto, kukonza njira yosinthira kutentha, ndi zina zambiri.
Ngati ili pulojekiti yatsopano, palibe pulojekiti yam'mbuyomu yomwe ingatsatire, ndiye kuti mungasankhire bwanji mphamvu ya MOSFET RDSON?Nayi njira yodziwitsira inu: njira yogawa magetsi.
Popanga makina opangira magetsi, zomwe zimadziwika ndi izi: voliyumu yolowera, voliyumu yotulutsa / kutulutsa kwapano, magwiridwe antchito, ma frequency ogwiritsira ntchito, voliyumu yoyendetsa, inde, pali zizindikiro zina zaukadaulo ndi ma MOSFET amphamvu okhudzana makamaka ndi magawowa.Masitepe ndi awa.
a.Malinga ndi kuchuluka kwa voteji, mphamvu zotulutsa / zotulutsa pano, magwiridwe antchito, kuwerengera kutayika kwakukulu kwadongosolo.
b.Kuwonongeka kwamphamvu kwamagetsi, kutayika kwazinthu zopanda mphamvu zamagetsi, kutayika kwa IC static ndi kutayika kwagalimoto, kuyerekeza movutikira, mtengo wampiriri ukhoza kuwerengera 10% mpaka 15% yazotayika zonse.
Ngati dera lamagetsi lili ndi chotsutsa chamakono, werengerani mphamvu zomwe zimagwiritsidwa ntchito pazitsulo zamakono.Kutayika kwathunthu kuchotsera zotayika izi pamwambapa, gawo lotsalira ndi chipangizo chamagetsi, chosinthira kapena kutayika kwamphamvu kwa inductor.
The otsala mphamvu imfa idzaperekedwa kwa chipangizo mphamvu ndi thiransifoma kapena inductor mu gawo linalake, ndipo ngati simuli wotsimikiza, pafupifupi kugawa ndi chiwerengero cha zigawo zikuluzikulu, kuti mutenge kutaya mphamvu iliyonse MOSFET.
c.Kutayika kwa mphamvu kwa MOSFET kumaperekedwa pakutayika kosinthika ndi kutayika kwa conduction mugawo linalake, ndipo ngati sizikudziwika, kutayika kwa kusintha ndi kutayika kwa conduction kumaperekedwa mofanana.
d.Mwa kutayika kwa MOSFET ndi kuyenderera kwaposachedwa kwa RMS, kuwerengera kukana kovomerezeka kovomerezeka, kukana uku ndi MOSFET pamlingo wopitilira kutentha kwa RDSON.
Deta ya data mu mphamvu MOSFET RDSON yolembedwa ndi miyeso yodziwika bwino, m'mikhalidwe yosiyana siyana imakhala ndi mfundo zosiyana, kutentha kwa mayeso: TJ = 25 ℃, RDSON ili ndi kutentha kwabwino, kotero malinga ndi kutentha kwapamwamba kwambiri kwa MOSFET ndi RDSON kutentha kokwana, kuchokera pamtengo wowerengeka wa RDSON, kuti mupeze RDSON yofananira pa kutentha kwa 25 ℃.
e.RDSON kuchokera ku 25 ℃ kuti musankhe mtundu woyenera wa mphamvu MOSFET, malinga ndi magawo enieni a MOSFET RDSON, pansi kapena mmwamba chepetsa.
Kudzera m'masitepe omwe ali pamwambapa, kusankha koyambirira kwa mtundu wa MOSFET wamphamvu ndi magawo a RDSON.
Nkhaniyi yachokera pa netiweki, chonde titumizireni kuti tichotse zolakwika, zikomo!
Zhejiang NeoDen Technology Co., Ltd. yakhala ikupanga ndi kutumiza kunja makina osiyanasiyana ang'onoang'ono osankha ndi malo kuyambira 2010. Kutengera mwayi wathu olemera odziwa R&D, kupanga ophunzitsidwa bwino, NeoDen imapeza mbiri yabwino kuchokera kwa makasitomala padziko lonse lapansi.
Ndi kupezeka kwapadziko lonse lapansi m'maiko opitilira 130, magwiridwe antchito abwino kwambiri, kulondola kwambiri komanso kudalirika kwa makina a NeoDen PNP amawapangitsa kukhala abwino pa R&D, kujambula kwaukatswiri komanso kupanga magulu ang'onoang'ono mpaka apakatikati.Timapereka yankho laukadaulo la zida za SMT imodzi.
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Nthawi yotumiza: Apr-19-2022