Nā alakaʻi no ke koho ʻana i ka pūʻolo MOSFET

ʻO ka lua, ka nui o nā palena ʻōnaehana

Ua kaupalena ʻia kekahi mau ʻōnaehana uila e ka nui o ka PCB a me ka mea i loko kiekie, se like me nā ʻōnaehana kamaʻilio, hoʻolako mana modular ma muli o nā palena kiʻekiʻe e hoʻohana maʻamau i ka DFN5 * 6, DFN3 * 3 pūʻolo; i kekahi ACDC mana lako, ka hoʻohana 'ana i ka ultra-thin manao paha ma muli o ka palena o ka pūpū, ka hui o ka TO220 pūʻolo o ka mana MOSFET wawae i hookomo pono 'ia i loko o ke kumu o ka palena kiʻekiʻe hiki ole ke hoʻohana i ka TO247 pūʻolo. ʻO kekahi hoʻolālā ultra-thin e kulou pololei ana i nā pine hāmeʻa, e lilo kēia kaʻina hana hoʻolālā i mea paʻakikī.

ʻO ke kolu, ke kaʻina hana o ka hui

ʻElua mau ʻano o ka TO220: ʻo ka ʻeke metala ʻole a me ka ʻeke plastik piha, ka liʻiliʻi o ka pale ʻana i ka wela, ʻoi aku ka ikaika o ka dissipation wela, akā i ke kaʻina hana, pono ʻoe e hoʻohui i ka hāʻule insulation, paʻakikī a paʻakikī ke kaʻina hana, ʻoiai ka nui o ka pale ʻana i ka wela piha piha, nāwaliwali ka hiki ʻana o ka wela, akā maʻalahi ke kaʻina hana.

I mea e hōʻemi ai i ke kaʻina hana hana o ka hoʻopaʻa ʻana i nā screws, i nā makahiki i hala iho nei, kekahi mau ʻōnaehana uila e hoʻohana ana i nā clips i ka manaMOSFET clamped i loko o ka wela wela, no laila, i ka puka ana mai o ka kuʻuna TO220 hapa o ka luna o ka wehe ana o na lua i ka hou ano o ka encapsulation, akā, e hoemi i ke kiekie o ka mea.

ʻO ka hā, ka hoʻokele waiwai

Ma kekahi mau noi koʻikoʻi koʻikoʻi e like me nā papa papa papapihi a me nā papa, hoʻohana mau ʻia nā MOSFET mana ma nā pūʻolo DPAK no ka haʻahaʻa o ia mau pūʻolo. No laila, i ke koho ʻana i kahi pūʻolo MOSFET mana, i hui pū ʻia me ke ʻano o kā lākou hui a me nā hiʻohiʻona huahana, a noʻonoʻo i nā mea i luna.

ʻO ka lima, koho i ka BVDSS kūpaʻa i ka nui o nā hihia, no ka mea, ʻo ka hoʻolālā ʻana o ka vo hoʻokomoiliili o ka uila paʻa paʻa ka ʻōnaehana, koho ka hui i kahi mea hoʻolako kikoʻī o kekahi helu waiwai, ua paʻa pū ka huahana i helu ʻia.

Ka breakdown voltage BVDSS o ka mana MOSFETs i loko o ka datasheet i ho'ākāka 'ia ho'āʻo kūlana, me ka likeʻole waiwai ma lalo o nā kūlana likeʻole, a me ka BVDSS i ka maikaʻi wela coefficient, i loko o ka noi maoli o ka hui ana o keia mau mea pono e noonoo i loko o ka piha ano.

ʻO ka nui o ka ʻike a me nā palapala i haʻi pinepine ʻia: inā ʻo ka ʻōnaehana o ka MOSFET VDS o ka voli spike kiʻekiʻe loa inā ʻoi aku ka nui ma mua o ka BVDSS, ʻoiai inā ʻo ka spike pulse voltage lōʻihi o nā liʻiliʻi a he ʻumi paha mau ns, e komo ka mana MOSFET i ka avalanche a pela ka poino.

ʻAʻole like me nā transistors a me IGBT, hiki i nā MOSFET mana ke kū'ē i ka avalanche, a he nui nā hui semiconductor nui mana MOSFET avalanche ikehu ma ka laina hana ka nānā piha, 100% ka nānāʻana,ʻo ia hoʻi, ma kaʻikepili kēia he ana i hōʻoiaʻiʻoʻia. ʻike pinepine ʻia ma 1.2 ~ 1.3 mau manawa o ka BVDSS, a ʻo ka lōʻihi o ka manawa he mau μs, ʻo ia hoʻi ka pae ms, a laila ʻO ka lōʻihi o ka liʻiliʻi a i ʻole ʻumi o nā ns, ʻoi aku ka haʻahaʻa ma mua o ka puʻupuʻu avalanche spike pulse voltage ʻaʻole ia e hōʻino i ka mana MOSFET.

ʻEono, e ka hoʻokele uila koho VTH

ʻAʻole like nā ʻōnaehana uila like ʻole o ka MOSFET i koho ʻia, ka mana AC / DC e hoʻohana maʻamau i ka 12V drive voltage, ka motherboard o ka motherboard DC / DC converter me ka hoʻohana ʻana i ka uila uila 5V, no laila e like me ka uila uila o ka ʻōnaehana e koho i kahi ʻokoʻa paepae ʻokoʻa. Nā MOSFET mana VTH.

ʻO ka volta paepae VTH o nā MOSFET mana i loko o ka ʻikepili i wehewehe pū i nā kūlana hoʻāʻo a loaʻa nā waiwai like ʻole ma lalo o nā kūlana like ʻole, a loaʻa iā VTH kahi koena wela maikaʻi ʻole. ʻO nā volta kaʻa like ʻole VGS e pili ana i nā ʻano kūʻē like ʻole, a ma nā noi kūpono he mea nui e noʻonoʻo i ka mahana.

Ma nā noi kūpono, pono e noʻonoʻo ʻia nā ʻano like ʻole o ka mahana e hōʻoia i ka hoʻohuli ʻia ʻana o ka mana MOSFET, ʻoiai i ka manawa like e hōʻoiaʻiʻo ana i nā pulse spike i hui pū ʻia me ka G-pole i ka wā o ka pani ʻana ʻaʻole e hoʻoulu ʻia e ka hoʻopunipuni hoʻopunipuni. e hana i kahi ala pololei a pōkole paha.