Indlela elungileyo yokukhetha iMOSFETs

Indlela elungileyo yokukhetha iiMOSFET

Ixesha lokuposa: May-20-2024

Khetha i-MOSFET echanekileyo yomqhubi wesekethe yinxalenye ebaluleke kakhuluI-MOSFET ukhetho alulunganga luya kuchaphazela ngokuthe ngqo ukusebenza kwesekethe yonke kunye neendleko zengxaki, oku kulandelayo sithi i-angle efanelekileyo yokukhethwa kwe-MOSFET.

I-1, i-N-channel kunye ne-P-channel yokukhetha
(1), kwiisekethe eziqhelekileyo, xa i-MOSFET imisiwe kwaye nomthwalo uqhagamshelwe kumbane we-trunk, i-MOSFET yenza iswitsha yecala lombane ophantsi. Kwi-low voltage side switch, i-N-channel MOSFET kufuneka isetyenziswe, ngenxa yokuqwalaselwa kwamandla ombane afunekayo ukucima okanye ukuvula isixhobo.

(2), xa i-MOSFET iqhagamshelwe ebhasini kwaye nomthwalo umisiwe, kufuneka kusetyenziswe iswitshi yecala lombane ophezulu. Ijelo lePIi-MOSFETs zidla ngokusetyenziswa kule topology, kwakhona kuqwalaselo lwevoltage drive.

2, ufuna ukukhetha okulungileyoI-MOSFET, kuyimfuneko ukumisela i-voltage efunekayo ukuqhuba ukulinganiswa kombane, kunye noyilo lweyona ndlela ilula yokuphumeza. Xa i-voltage elinganisiweyo inkulu, isixhobo ngokwemvelo siya kufuna ixabiso eliphezulu. Kuyilo oluphathwayo, ii-voltages ezisezantsi zixhaphake kakhulu, ngelixa kuyilo lwemizi-mveliso, i-voltages ephezulu iyafuneka. Ngokubhekiselele kumava asebenzayo, amandla ombane alinganisiweyo kufuneka abe mkhulu kune-trunk okanye umbane webhasi. Oku kuya kubonelela ngokhuseleko olwaneleyo ukwenzela ukuba i-MOSFET ingaphumeleli.

I-3, ilandelwa yisakhiwo sesekethe, ukulinganiswa kwangoku kufuneka kube ngowona mzuzu uphezulu wokuba umthwalo unokumelana phantsi kwazo zonke iimeko, obuye usekelwe kukhuseleko lwemiba eyimfuneko yokuqwalasela.

4. Okokugqibela, ukusebenza kokutshintsha kweMOSFET kumiselwe. Kukho iiparitha ezininzi ezichaphazela ukusebenza kokutshintsha, kodwa eyona nto ibaluleke kakhulu yisango / i-drain, isango / umthombo kunye ne-drain / source capacitance. Ezi capacitances zidala ilahleko zokutshintsha kwisixhobo kuba kufuneka zihlawulwe ngexesha lokutshintsha ngalunye.