Kusanthula kwazomwe zimayambitsa kutentha kwa MOSFET

N mtundu, P mtundu MOSFET ntchito mfundo za kwenikweni ndi chimodzimodzi, MOSFET makamaka anawonjezera kulowetsa mbali ya voteji pachipata kuti bwinobwino kulamulira linanena bungwe kukhetsa panopa, MOSFET ndi voteji ankalamulira chipangizo, kudzera voteji anawonjezera. kupita kuchipata kuti muwongolere mawonekedwe a chipangizocho, mosiyana ndi ma triode kuti asinthe nthawi chifukwa chazomwe zimayambitsidwa ndi kusungirako ndalama, posintha mapulogalamu, MOSFET's In switching application,Zithunzi za MOSFET liwiro losinthira ndilothamanga kuposa la triode.

 

Mumagetsi osinthira, omwe amagwiritsidwa ntchito kwambiri ndi MOSFET, kukhetsa kumalumikizidwa ndi katundu monga, kutchedwa open drain, open drain circuit, katundu umalumikizidwa ndi kuchuluka kwa voliyumu, amatha kuyatsa, kuzimitsa katundu panopa, ndi abwino analogi kusintha chipangizo, amene ndi mfundo ya MOSFET kuchita kusintha zipangizo, ndi MOSFET kuchita kusintha mu mawonekedwe a mabwalo zambiri.

 

Pankhani ya kusintha kwa magetsi, izi zimafunikira Zithunzi za MOSFET kuti nthawi ndi nthawi kuzichita, kuzimitsa, monga magetsi a DC-DC omwe amagwiritsidwa ntchito kwambiri posinthira tonde amadalira ma MOSFET awiri kuti agwire ntchito yosinthira, masinthidwe awa mosiyanasiyana mu inductor kusunga mphamvu, kumasula mphamvu ku katundu, nthawi zambiri amasankha. mazana a kHz kapena kupitilira 1 MHz, makamaka chifukwa ma frequency apamwamba ndiye kuti maginito ang'onoang'ono. Panthawi yogwira ntchito bwino, MOSFET imakhala yofanana ndi kondakitala, mwachitsanzo, ma MOSFET amphamvu kwambiri, ma MOSFET ang'onoang'ono, mabwalo, magetsi ndi kutayika kochepa kwa MOS.

 

Magawo a PDF a MOSFET, opanga MOSFET atengera bwino magawo a RDS (ON) kuti afotokoze zachitetezo cha boma, pakusintha mapulogalamu, RDS (ON) ndiye mawonekedwe ofunikira kwambiri pazida; ma data amatanthawuza RDS (ON), chipata (kapena choyendetsa) voteji VGS ndi zomwe zikuyenda kudzera pa switch ndizogwirizana, pagalimoto yokwanira pachipata, RDS (ON) ndi gawo lokhazikika; Ma MOSFET omwe akhala akuwongolera amatha kutulutsa kutentha, ndipo kuwonjezereka kwapang'onopang'ono kutentha kwapakati kungayambitse kuwonjezeka kwa RDS (ON);MOSFET Ma data amafotokoza gawo la kutentha kwa kutentha, komwe kumatanthauzidwa ngati kuthekera kwa gawo la semiconductor la phukusi la MOSFET kuti lisungunuke kutentha, ndipo RθJC imangotanthauzidwa ngati njira yolumikizirana ndi vuto.

 

1, ma frequency ndi okwera kwambiri, nthawi zina kuthamangitsa voliyumu, kumatsogolera kufupipafupi, MOSFET pakuwonongeka kumawonjezeka, kutentha kwakukulu, osachita ntchito yabwino yopangira kutentha kokwanira, kuchuluka kwaposachedwa, dzina lodziwika bwino. mtengo wapano wa MOSFET, kufunikira kwa kutentha kwabwino kuti athe kukwaniritsa; ID ndi yocheperako kuposa yomwe ilipo, ikhoza kukhala kutentha kwakukulu, kufunikira kwa ma heatsink othandizira okwanira.

 

2, zolakwika pakusankha kwa MOSFET ndi zolakwika pakuweruza kwamphamvu, kukana kwamkati kwa MOSFET sikuganiziridwa mokwanira, kumatsogolera pakuwonjezereka kwakusintha kosinthika, polimbana ndi zovuta za kutentha kwa MOSFET.

 

3, chifukwa cha zovuta za kapangidwe ka dera, zomwe zimapangitsa kutentha, kotero kuti MOSFET imagwira ntchito motsatira mzere, osati pakusintha, komwe ndi chifukwa chakutentha kwa MOSFET, mwachitsanzo, N-MOS kusintha, G- voteji mlingo uyenera kukhala wapamwamba kuposa magetsi ndi V ochepa, kuti athe kuchititsa mokwanira, ndi P-MOS ndi osiyana; pakapanda kutseguka kwathunthu, kutsika kwamagetsi kumakhala kwakukulu kwambiri, zomwe zingayambitse kugwiritsira ntchito mphamvu, zofanana ndi DC impedance ndizokulirapo, kutsika kwamagetsi kudzawonjezekanso, U * Ndidzawonjezeranso, kutayika kumayambitsa kutentha.