PMOSFET yog dab tsi, koj puas paub?

I. Cov qauv tsim thiab cov qauv kev ua haujlwm

1. Cov qauv tsim

PMOSFETs muaj n-hom substrates thiab p-channels, thiab lawv cov qauv feem ntau muaj lub rooj vag (G), qhov chaw (S) thiab qhov ntws (D). Ntawm n-hom silicon substrate, muaj ob thaj tsam P + uas ua haujlwm raws li qhov chaw thiab ntws, feem, thiab lawv tau txuas rau ib leeg los ntawm p-channel. Lub rooj vag yog nyob saum cov channel thiab cais tawm ntawm cov channel los ntawm cov hlau oxide insulating txheej.

2. Cov ntsiab lus ntawm kev ua haujlwm

PMOSFETs ua haujlwm zoo ib yam li NMOSFETs, tab sis nrog cov neeg nqa khoom sib txawv. Hauv PMOSFET, cov nqa khoom tseem ceeb yog qhov. Thaum lub qhov hluav taws xob tsis zoo siv rau lub rooj vag nrog rau qhov chaw, p-type inverse txheej yog tsim nyob rau saum npoo ntawm n-hom silicon nyob rau hauv lub rooj vag, uas ua hauj lwm raws li ib tug trench txuas qhov chaw thiab ntws. Hloov lub rooj vag voltage hloov qhov ceev ntawm qhov hauv cov channel, yog li tswj cov conductivity ntawm cov channel. Thaum lub rooj vag voltage tsawg txaus, qhov ntom ntawm qhov hauv cov channel nce mus txog qib siab txaus kom tso cai rau kev coj ua ntawm qhov chaw thiab ntws; conversely, lub channel txiav tawm.

II. Cov yam ntxwv thiab kev siv

1. Cov yam ntxwv

Tsawg Mobility: P-channel MOS transistors muaj qhov tsis tshua muaj qhov txav mus los, yog li kev hloov pauv ntawm PMOS transistors tsawg dua li ntawm NMOS transistors nyob rau hauv tib lub geometry thiab kev khiav hauj lwm voltage.

Tsim nyog rau kev siv tsawg-ceev, tsis tshua muaj zaus: Vim qhov qis qis qis, PMOS kev sib xyaw ua ke zoo dua rau cov ntawv thov hauv qhov chaw qis, tsawg zaus.

Conduction tej yam kev mob: Cov conduction tej yam kev mob ntawm PMOSFET yog opposite rau NMOSFETs, yuav tsum tau ib tug qhov rooj voltage qis dua qhov voltage.

 

1. Daim ntawv thov

High Side Switching: PMOSFETs feem ntau yog siv nyob rau hauv high side switching configurations qhov twg lub hauv paus yog kev cob cog rua rau cov khoom zoo thiab cov ntws yog txuas nrog rau qhov zoo kawg ntawm lub load. Thaum PMOSFET ua, nws txuas qhov kawg ntawm qhov load mus rau qhov zoo, tso cai rau tam sim no ntws los ntawm lub load. Qhov kev teeb tsa no muaj ntau heev hauv thaj chaw xws li kev tswj fais fab thiab lub cev muaj zog.

Rov qab tiv thaiv Circuits: PMOSFETs kuj tuaj yeem siv rau hauv kev tiv thaiv rov qab los tiv thaiv kev puas tsuaj rau Circuit Court los ntawm kev rov qab fais fab mov lossis thauj khoom tam sim no rov qab.

III. Tsim thiab xav txog

1. GATE VOLTAGE tswj

Thaum tsim PMOSFET circuits, kev tswj hwm ntawm lub rooj vag hluav taws xob yuav tsum tau ua kom muaj kev ua haujlwm zoo. Txij li thaum lub conduction tej yam kev mob ntawm PMOSFETs yog opposite rau cov NMOSFETs, yuav tsum tau them nyiaj mloog mus rau lub polarity thiab magnitude ntawm lub rooj vag voltage.

2. Load txuas

Thaum txuas lub load, yuav tsum tau them nyiaj mloog mus rau lub polarity ntawm lub load los xyuas kom meej tias cov tam sim no ntws los ntawm lub PMOSFET, thiab cov nyhuv ntawm load rau cov kev ua tau zoo ntawm PMOSFET, xws li voltage poob, hwj chim noj, thiab lwm yam. , kuj yuav tsum tau xav txog.

3. Kub stability

Kev ua haujlwm ntawm PMOSFETs cuam tshuam zoo heev los ntawm qhov kub thiab txias, yog li qhov cuam tshuam ntawm qhov kub ntawm qhov kev ua haujlwm ntawm PMOSFETs yuav tsum tau coj mus rau hauv tus account thaum tsim cov circuits, thiab cov kev ntsuas sib xws yuav tsum tau coj los txhim kho qhov kub thiab txias ntawm circuits.

4. Kev tiv thaiv Circuit Court

Txhawm rau tiv thaiv PMOSFETs los ntawm kev puas tsuaj los ntawm overcurrent thiab overvoltage thaum lub sijhawm ua haujlwm, kev tiv thaiv circuits xws li kev tiv thaiv overcurrent thiab tiv thaiv overvoltage yuav tsum tau muab tso rau hauv Circuit Court. Cov kab hluav taws xob tiv thaiv no tuaj yeem tiv thaiv PMOSFET zoo thiab txuas ntxiv nws lub neej kev pabcuam.

 

Hauv cov ntsiab lus, PMOSFET yog ib hom MOSFET nrog cov qauv tshwj xeeb thiab kev ua haujlwm. Nws tsis tshua muaj kev txav mus los thiab tsim nyog rau kev siv qis qis, qis zaus ua rau nws siv dav hauv cov haujlwm tshwj xeeb. Thaum tsim PMOSFET circuits, yuav tsum tau them nyiaj mloog mus rau lub rooj vag voltage tswj, thauj khoom sib txuas, kub ruaj khov thiab tiv thaiv circuits kom paub meej tias kev ua haujlwm zoo thiab kev ntseeg siab ntawm Circuit Court.