Dab tsi yog daim ntawv thov scenarios rau MOSFETs?

MOSFETs tau dav siv nyob rau hauv analog thiab digital circuits thiab muaj feem xyuam nrog peb lub neej.Qhov zoo ntawm MOSFETs yog: lub voj voog tsav yog qhov yooj yim.MOSFETs yuav tsum tau tsav tam sim no ntau dua li BJTs, thiab feem ntau tuaj yeem tsav ncaj qha los ntawm CMOS lossis qhib cov khoom siv. TTL tsav tsheb circuits. Thib ob, MOSFETs hloov sai dua thiab tuaj yeem ua haujlwm ntawm qhov nrawm dua vim tias tsis muaj nqi cia. Tsis tas li ntawd, MOSFETs tsis muaj cov txheej txheem tsis ua haujlwm thib ob. Qhov siab dua qhov kub, feem ntau qhov muaj zog ntawm kev ua siab ntev, qhov qis dua qhov muaj peev xwm ntawm thermal tawg, tab sis kuj nyob rau hauv ntau qhov kub thiab txias kom muab kev ua tau zoo dua.MOSFETs tau siv ntau hauv kev siv, hauv cov khoom siv hluav taws xob, cov khoom lag luam, electromechanical. cov khoom siv, cov xov tooj ntse thiab lwm yam khoom siv hluav taws xob digital portable tuaj yeem pom nyob txhua qhov chaw.

MOSFET daim ntawv thov cov ntaub ntawv txheeb xyuas

1 、 Hloov cov ntawv thov hluav taws xob

Los ntawm kev txhais, daim ntawv thov no xav kom MOSFETs ua thiab kaw ib ntus. Nyob rau tib lub sijhawm, muaj ntau ntau qhov topologies tuaj yeem siv rau kev hloov hluav taws xob, xws li DC-DC fais fab mov feem ntau siv rau hauv lub tshuab phaw yooj yim siv ob lub MOSFETs los ua qhov kev hloov pauv, cov hloov pauv hloov pauv hauv inductor khaws cia. zog, thiab ces qhib lub zog rau lub load. Tam sim no, cov neeg tsim qauv feem ntau xaiv cov zaus hauv ntau pua kHz thiab txawm tias siab dua 1MHz, vim tias qhov ntau zaus, qhov me me thiab sib zog ntawm cov khoom sib nqus. Qhov thib ob tseem ceeb tshaj plaws MOSFET tsis nyob rau hauv kev hloov cov khoom siv hluav taws xob muaj xws li cov khoom siv hluav taws xob tso tawm, qhov pib hluav taws xob, lub rooj vag impedance thiab avalanche zog.

2, kev siv lub cev muaj zog

Daim ntawv thov tswj lub cev muaj zog yog lwm qhov chaw thov rau lub zogMOSFETs. Ib nrab choj tswj Circuit Court siv ob MOSFETs (tag nrho-bridge siv plaub), tab sis ob lub MOSFETs tawm lub sij hawm (tuag sij hawm) sib npaug. Rau daim ntawv thov no, lub sijhawm rov qab los (trr) yog qhov tseem ceeb heev. Thaum tswj lub inductive load (xws li lub cev muaj zog winding), cov tswj Circuit Court hloov MOSFET nyob rau hauv tus choj Circuit Court mus rau hauv lub xeev tawm, nyob rau hauv uas taw tes lwm hloov nyob rau hauv lub choj Circuit Court ib ntus reverses tam sim no los ntawm lub cev diode nyob rau hauv lub MOSFET. Yog li, tam sim no circulates dua thiab txuas ntxiv zog rau lub cev muaj zog. Thaum thawj MOSFET rov ua dua, cov nqi khaws cia hauv lwm lub MOSFET diode yuav tsum raug tshem tawm thiab tawm los ntawm thawj MOSFET. Qhov no yog lub zog poob, yog li qhov luv luv trr, qhov tsawg dua qhov poob.

3, automotive daim ntawv thov

Kev siv lub zog MOSFETs hauv kev siv tsheb tau loj hlob sai hauv 20 xyoo dhau los. Hwj chimMOSFETraug xaiv vim tias nws tuaj yeem tiv taus qhov tshwm sim ntawm qhov siab-voltage tshwm sim los ntawm cov khoom siv hluav taws xob hauv tsheb, xws li kev thauj khoom thiab kev hloov pauv sai ntawm lub zog, thiab nws cov pob yog yooj yim, feem ntau yog siv TO220 thiab TO247 pob. Nyob rau tib lub sijhawm, cov ntawv thov xws li lub qhov rais fais fab, kev txhaj tshuaj roj, cov wipers sib quas ntus, thiab kev tswj kev caij nkoj tau maj mam dhau los ua qauv hauv cov tsheb feem ntau, thiab cov khoom siv hluav taws xob zoo sib xws yog xav tau hauv kev tsim. Lub sijhawm no, automotive zog MOSFETs hloov zuj zus raws li lub cev muaj zog, solenoids, thiab roj injectors tau nrov dua.

MOSFETs siv nyob rau hauv cov khoom siv tsheb npog ntau qhov voltages, tam sim no, thiab kev tiv thaiv. Lub cev muaj zog tswj cov cuab yeej txuas txuas kev teeb tsa siv 30V thiab 40V kev puas tsuaj hluav taws xob qauv, 60V cov cuab yeej siv los tsav cov khoom thauj khoom uas yuav tsum tau tswj xyuas qhov kev thauj mus los sai sai, thiab 75V thev naus laus zis yuav tsum tau ua thaum tus qauv kev lag luam hloov mus rau 42V roj teeb. Cov cuab yeej siv hluav taws xob siab siab yuav tsum tau siv cov qauv 100V txog 150V, thiab MOSFET cov cuab yeej siv siab tshaj 400V yog siv rau hauv lub cav tsav tsheb thiab tswj Circuit Court rau kev siv hluav taws xob siab (HID) headlamps.

Automotive MOSFET tsav tam sim no ntawm 2A mus rau ntau tshaj 100A, nrog rau kev ua haujlwm ntawm 2mΩ txog 100mΩ. MOSFET loads muaj xws li motors, li qub, teeb, cua sov Cheebtsam, capacitive piezoelectric sib dhos thiab DC / DC fais fab mov. Hloov zaus zaus ntawm 10kHz mus rau 100kHz, nrog rau qhov caveat tias lub cev muaj zog tswj tsis haum rau kev hloov zaus tshaj 20kHz. Lwm qhov kev xav tau tseem ceeb yog UIS kev ua haujlwm, kev ua haujlwm ntawm kev sib tshuam kub txwv (-40 degrees txog 175 degrees, qee zaum mus txog 200 degrees) thiab kev ntseeg siab tshaj lub neej ntawm lub tsheb.

4, LED teeb thiab teeb tsav tsheb

Hauv kev tsim cov teeb ci LED thiab teeb ci feem ntau siv MOSFET, rau cov tsav tsheb tam sim no tsis tu ncua, feem ntau siv NMOS. fais fab MOSFET thiab bipolar transistor feem ntau txawv. Nws lub rooj vag capacitance kuj loj. Lub capacitor yuav tsum tau them ua ntej conduction. Thaum lub capacitor voltage tshaj qhov pib voltage, MOSFET pib ua. Yog li ntawd, nws yog ib qho tseem ceeb uas yuav tsum nco ntsoov thaum tsim lub peev xwm ntawm lub qhov rooj tsav tsheb yuav tsum loj txaus los xyuas kom meej tias qhov kev them nyiaj ntawm qhov sib npaug ntawm lub rooj vag capacitance (CEI) ua tiav nyob rau lub sijhawm xav tau los ntawm lub kaw lus.

Kev hloov ceev ntawm MOSFET yog nyob ntawm qhov kev them nyiaj thiab tso tawm ntawm cov khoom siv hluav taws xob. Txawm hais tias tus neeg siv tsis tuaj yeem txo tus nqi ntawm Cin, tab sis tuaj yeem txo tus nqi ntawm lub rooj vag tsav lub voj teeb liab qhov chaw sab hauv tsis kam Rs, yog li txo lub rooj vag lub voj voog them thiab tshem tawm lub sij hawm tsis tu ncua, txhawm rau txhawm rau txhawm rau hloov ceev, qhov dav dav IC tsav muaj peev xwm. yog feem ntau reflected ntawm no, peb hais tias qhov kev xaiv ntawmMOSFEThais txog MOSFET sab nraud tsav tas li-tam sim no ICs. built-in MOSFET ICs tsis tas yuav xav txog. Feem ntau hais lus, MOSFET sab nraud yuav raug txiav txim siab rau qhov tam sim no tshaj 1A. Txhawm rau kom tau txais lub zog loj dua thiab hloov tau yooj yim LED lub peev xwm, MOSFET sab nraud yog tib txoj hauv kev xaiv IC yuav tsum tau tsav los ntawm qhov tsim nyog muaj peev xwm, thiab MOSFET input capacitance yog qhov tseem ceeb.