Ungakhetha kanjani umjikelezo womshayeli ofaneleka kakhulu we-MOSFET?

Ohlelweni lokushintshwa kwamandla nolunye uhlelo lokuklama isistimu yokuphakelwa kwamandla, abaklami bohlelo bazonaka kakhulu inani lemingcele emikhuluI-MOSFET, njenge-resistor ecishiwe, i-voltage enkulu yokusebenza, ukugeleza kwamandla okukhudlwana. Nakuba le elementokugxekayo, kucatshangelwa indawo engafanele kuzokwenza ukuthi isifunda sokuhlinzeka amandla singakwazi ukusebenza kahle, kodwa empeleni, lokhu kuqedwa kuphela isinyathelo sokuqala,i-MOSFET amapharamitha we-parasitic athathwa njengento ebalulekile yokubeka engcupheni umjikelezo wokuphakelwa kwamandla.

Ukushayela ngokushesha kwama-MOSFET anama-IC wokuphakela amandla

Umjikelezo omuhle womshayeli we-MOSFET unalezi zinhlinzeko ezilandelayo:

(1) Lapho iswishi ivuliwe, isekethe yomshayeli kufanele ikwazi ukukhipha i-current enkulu kakhulu, ukuze i-voltage yokusebenza ye-MOSFET gate-source inter-pole ikhuphuke ngokushesha enanini elidingekayo, ukuqinisekisa ukuthi iswishi ingashintshwa. ngokushesha futhi ngeke kube khona ama-oscillations aphezulu onqenqemeni olukhuphukayo.

(2) isikhathi sokuvula nokuvala amandla, isekethe yokushayela ingaqinisekisa ukuthi i-voltage yokusebenza yomthombo we-MOSFET yomthombo we-inter-pole igcinwa isikhathi eside, nokuqhutshwa ngempumelelo.

(3) Vala umzuzwana wesekethe yedrayivu, ingahlinzeka ngeshaneli ye-impedance ephansi ye-voltage yokusebenza kwamandla omthombo wesango le-MOSFET phakathi kokukhipha amanzi ngokushesha, ukuze kuqinisekiswe ukuthi iswishi ingacishwa ngokushesha.

Ungakhetha kanjani umjikelezo womshayeli ofaneleka kakhulu we-MOSFET(1)

(4) Ukwakhiwa okulula nokuthembekile kwamasekethe okushayela ngokuguga okuphansi nokukhala.

(5) Ngokusho kwesimo esithile ukwenza isivikelo.

Kugesi wemojula yokulawula, okuvame kakhulu ukuhlinzekwa kwamandla kagesi i-IC ishayela ngokuqondile i-MOSFET. isicelo, kufanele sinake idrayivu emikhulu inani eliphakeme kakhulu lokugeleza kwamandla, amandla okusabalalisa kwe-MOSFET 2 imingcele eyinhloko. Amandla we-Power IC drive, usayizi we-MOS wokusabalalisa amandla, inani lokumelana nedrayivu kuzobeka engcupheni izinga lokushintsha amandla e-MOSFET. Uma ukukhethwa komthamo wokusabalalisa we-MOSFET kukhulu uma kuqhathaniswa, amandla okunikezwa kwamandla kwe-IC yangaphakathi kwedrayivu akwanele, kufanele kube sesekethe yedrayivu ukuze kuthuthukiswe ikhono lokushayela, ngokuvamile kusetshenziswe isekethe ye-totem pole power supply ukuze kuthuthukiswe amandla okunikezwa kwamandla kwe-IC drive. .