Malangizo a MOSFET Package Selection

Chachiwiri, kukula kwa zofooka za dongosolo

Makina ena apakompyuta amachepetsedwa ndi kukula kwa PCB ndi mkati kutalika, smonga njira zoyankhulirana, magetsi osinthika chifukwa cha kuchepa kwa kutalika nthawi zambiri amagwiritsa ntchito phukusi la DFN5 * 6, DFN3 * 3; mu magetsi ena a ACDC, kugwiritsa ntchito mapangidwe owonda kwambiri kapena chifukwa cha zofooka za chipolopolo, kusonkhana kwa phukusi la TO220 la mphamvu za MOSFET zomwe zimayikidwa mwachindunji muzu wa zoperewera za msinkhu sizingagwiritse ntchito phukusi la TO247. Mapangidwe ena owonda kwambiri omwe amapindika mwachindunji mapini a chipangizocho, kupanga mapangidwe awa kumakhala kovuta.

Chachitatu, ndondomeko yopanga kampani

TO220 ali mitundu iwiri ya phukusi: anabala zitsulo phukusi ndi zonse pulasitiki phukusi, anabala zitsulo phukusi matenthedwe kukana ndi yaing'ono, kutentha disipation mphamvu ndi amphamvu, koma ndondomeko kupanga, muyenera kuwonjezera kutchinjiriza dontho, kupanga ndondomeko zovuta ndi okwera mtengo, pamene phukusi lathunthu la pulasitiki lotenthetsera kukana ndi lalikulu, mphamvu ya kutaya kutentha ndi yofooka, koma kupanga ndi kosavuta.

Pofuna kuchepetsa njira yokumba ya zomangira zokhoma, m'zaka zaposachedwa, machitidwe ena apakompyuta omwe amagwiritsa ntchito tatifupi kuti apereke mphamvu.Zithunzi za MOSFET clamped mu kutentha lakuya, kotero kuti zikamera wa chikhalidwe TO220 mbali ya kumtunda kwa kuchotsa mabowo mu mawonekedwe atsopano encapsulation, komanso kuchepetsa kutalika kwa chipangizo.

Chachinayi, kuwongolera mtengo

Muzinthu zina zotsika mtengo kwambiri monga ma boardboard apakompyuta ndi ma board, ma MOSFET amphamvu m'maphukusi a DPAK amagwiritsidwa ntchito chifukwa chotsika mtengo pamaphukusi oterowo. Choncho, posankha mphamvu MOSFET phukusi, pamodzi ndi kalembedwe kampani yawo ndi mankhwala mbali, ndi kuganizira zinthu pamwamba.

Chachisanu, sankhani kupirira voteji BVDSS nthawi zambiri, chifukwa kamangidwe ka athandizira vogawo la elektroniki Dongosolo limakhazikika, kampaniyo idasankha wopereka manambala ena azinthu, ma voliyumu omwe adavoteledwa amakhazikitsidwanso.

The kuwonongeka voteji BVDSS mphamvu MOSFETs mu datasheet limafotokoza mikhalidwe mayeso, ndi makhalidwe osiyanasiyana pansi pa zinthu zosiyanasiyana, ndi BVDSS ali ndi kutentha koyenera zabwino, mu ntchito yeniyeni ya kuphatikiza zinthuzi ayenera kuganiziridwa mwatsatanetsatane.

Zambiri komanso zolemba zambiri zimatchulidwa nthawi zambiri: ngati mphamvu ya MOSFET VDS yamagetsi apamwamba kwambiri ngati ikukwera kuposa BVDSS, ngakhale kukwera kwamagetsi kwanthawi yayitali kapena makumi angapo a ns, mphamvu ya MOSFET idzalowa mu chigumukire. motero kuwonongeka kumachitika.

Mosiyana transistors ndi IGBT, mphamvu MOSFETs amatha kukana chigumukire, ndi ambiri makampani semiconductor mphamvu MOSFET chigumukire mphamvu mu mzere kupanga ndi anayendera zonse, 100% kuzindikira, ndiko kuti, mu deta ichi ndi muyeso wotsimikizika, chigumukire voteji. nthawi zambiri zimachitika mu 1.2 ~ 1.3 nthawi BVDSS, ndipo nthawi yanthawiyo nthawi zambiri imakhala μs, ngakhale mulingo wa ms, ndiye nthawi yayitali. mwa ochepa kapena makumi a ns, otsika kwambiri kuposa voteji ya avalanche spike pulse voltage sikuwononga mphamvu ya MOSFET.

Chachisanu ndi chimodzi, ndi kusankha VTH pagalimoto

Makina osiyanasiyana amagetsi amagetsi a MOSFET osankhidwa oyendetsa galimoto sali ofanana, magetsi a AC / DC nthawi zambiri amagwiritsa ntchito 12V drive voltage, chosinthira cholembera cholembera cha DC / DC chogwiritsa ntchito 5V drive voltage, kotero kutengera voteji yamagetsi kuti musankhe voteji yosiyana. VTH mphamvu MOSFETs.

Mphamvu yamagetsi ya VTH ya mphamvu ya MOSFET mu datasheet imakhalanso ndi miyeso yoyesera ndipo imakhala ndi makhalidwe osiyanasiyana, ndipo VTH ili ndi kutentha kwapakati. Ma voliyumu osiyanasiyana a VGS amafanana ndi zopinga zosiyanasiyana, ndipo pamagwiritsidwe ntchito ndikofunikira kuganizira kutentha.

M'magwiritsidwe ntchito, kusiyanasiyana kwa kutentha kuyenera kuganiziridwa kuti kuwonetsetsa kuti mphamvu ya MOSFET yayatsidwa kwathunthu, pomwe nthawi yomweyo kuwonetsetsa kuti ma spike pulses ophatikizidwa ndi G-pole panthawi yotseka sizingayambitsidwe ndi zoyambitsa zabodza. kupanga njira yowongoka kapena yaifupi.