Kufotokozera kwa gawo lililonse la mphamvu MOSFETs

VDSS Maximum Drain-Source Voltage

Ndi gwero lachipata lafupikitsidwa, ma drain-source voltage rating (VDSS) ndiye voteji yayikulu kwambiri yomwe ingagwiritsidwe ntchito pagwero la kukhetsa popanda kuwonongeka kwa avalanche. Kutengera ndi kutentha, voteji yeniyeni yowonongeka ikhoza kukhala yotsika kuposa VDSS yovotera. Kuti mumve zambiri za V(BR)DSS, onani Electrostatic

Kuti mumve zambiri za V(BR)DSS, onani Electrostatic Characteristics.

VGS Maximum Gate Source Voltage

Voliyumu ya VGS ndiye mphamvu yayikulu kwambiri yomwe ingagwiritsidwe ntchito pakati pa mitengo yoyambira pachipata. Cholinga chachikulu chokhazikitsa voteji iyi ndikuletsa kuwonongeka kwa oxide pachipata chifukwa chamagetsi ochulukirapo. Mpweya weniweni womwe chipata cha oxide chingathe kupirira ndipamwamba kwambiri kuposa magetsi ovotera, koma amasiyana ndi kupanga.

Chipata chenicheni cha oxide chitha kupirira ma voltages apamwamba kwambiri kuposa ma voliyumu ovotera, koma izi zimasiyana ndi njira yopangira, kotero kusunga VGS mkati mwamagetsi ovotera kudzatsimikizira kudalirika kwa ntchitoyo.

ID - Kutayikira Kupitilira Pakalipano

ID imatanthauzidwa ngati pazipita zovomerezeka mosalekeza za DC pa kutentha kopitilira muyeso, TJ(max), ndi kutentha kwachubu kwa 25°C kapena kupitilira apo. Parameter iyi ndi ntchito ya kukana kwamafuta pakati pa mphambano ndi mlandu, RθJC, ndi kutentha kwa mlandu:

Kusintha kotayika sikuphatikizidwa mu ID ndipo n'zovuta kusunga kutentha kwa chubu pamwamba pa 25 ° C (Tcase) kuti mugwiritse ntchito. Chifukwa chake, kusintha kwenikweni pamapulogalamu osinthira movutikira nthawi zambiri kumakhala kosakwana theka la ma ID @ TC = 25°C, nthawi zambiri mumitundu ya 1/3 mpaka 1/4. wowonjezera.

Kuphatikiza apo, ID pa kutentha kwina imatha kuyerekezedwa ngati kukana kwamafuta JA kumagwiritsidwa ntchito, komwe kuli mtengo weniweni.

IDM - Impulse Drain Current

Izi zikuwonetsa kuchuluka kwa pulsed pakali pano chomwe chipangizochi chingagwire, chomwe ndi chokwera kwambiri kuposa pakalipano ya DC. Cholinga chofotokozera IDM ndi: dera la ohmic la mzere. Kwa magetsi ena a gate-source, theMOSFETimayendetsa ndi kukhetsa kwakukulu komwe kulipo

panopa. Monga momwe tawonetsera pachithunzichi, pamagetsi operekedwa pachipata, ngati malo ogwirira ntchito ali m'dera lozungulira, kuwonjezeka kwa madzi akukhetsa kumakweza mphamvu yamagetsi, zomwe zimawonjezera kuwonongeka kwa conduction. Kugwiritsa ntchito nthawi yayitali pamagetsi apamwamba kumapangitsa kuti chipangizocho chilephereke. Pachifukwa ichi

Chifukwa chake, IDM yodziwika bwino ikuyenera kukhazikitsidwa m'munsi mwa chigawocho pama voltages wamba. Malo opumira a derali ali pamphambano za Vgs ndi pamapindikira.

Chifukwa chake, malire a kachulukidwe apamwamba akuyenera kukhazikitsidwa kuti chip chisatenthe kwambiri ndikuyaka. Izi ndizofunikira kuti tipewe kuyenderera kwaposachedwa kudzera pamapaketi, chifukwa nthawi zina "kulumikizana kofooka" pa chip chonse si chip, koma phukusi limatsogolera.

Poganizira zoperewera za kutentha kwa IDM, kuwonjezeka kwa kutentha kumadalira kukula kwa pulse, nthawi yapakati pa pulse, kutentha kwa kutentha, RDS (pa), ndi mawonekedwe a mafunde ndi matalikidwe a pulse panopa. Kungokhutiritsa kuti kugunda kwamphamvu sikudutsa malire a IDM sikutsimikizira kuti kutentha kwa mphambano

sichidutsa pamtengo wovomerezeka. Kutentha kolowera pansi pa pulsed current kumatha kuyerekezedwa potengera zokambirana za kukana kwanthawi yayitali mu Thermal and Mechanical Properties.

PD - Total Allowable Channel Power Dissipation

Total Allowable Channel Power Dissipation imayang'anira mphamvu yowonongeka kwambiri yomwe ingathe kutayidwa ndi chipangizocho ndipo ikhoza kuwonetsedwa ngati ntchito ya kutentha kwakukulu kwa kutentha ndi kukana kutentha pa kutentha kwa 25 ° C.

TJ, TSTG - Operating and Storage Ambient Temperature Range

Zigawo ziwirizi zimayang'anira kutentha kwa mphambano komwe kumaloledwa ndi malo ogwiritsira ntchito ndi kusunga. Kutentha uku kumayikidwa kuti zigwirizane ndi moyo wocheperako wa chipangizocho. Kuonetsetsa kuti chipangizochi chikugwira ntchito mkati mwa kutentha kumeneku kudzakulitsa kwambiri moyo wake wogwira ntchito.

EAS-Single Pulse Avalanche Breakdown Energy

Ngati voteji overshoot (kawirikawiri chifukwa kutayikira panopa ndi osochera inductance) si upambana voteji kusweka, chipangizo sadzakhala kukumana chigumukire kusweka choncho safuna mphamvu kuwononga chigumukire kusweka. Mphamvu yakuwonongeka kwa avalanche imathandizira kuphulika kwakanthawi komwe chipangizocho chimatha kupirira.

Mphamvu yowononga chigumukire imatanthawuza mtengo wotetezeka wa voteji yanthawi yochepa yomwe chipangizochi imatha kupirira, ndipo zimadalira kuchuluka kwa mphamvu zomwe zimayenera kutayidwa kuti chigumukire chiwonongeke.

Chida chomwe chimatanthawuza kuchuluka kwa mphamvu zakuwonongeka kwamphamvu nthawi zambiri chimatanthawuzanso mavoti a EAS, omwe ndi ofanana ndi mavoti a UIS, ndikutanthauzira kuchuluka kwa mphamvu zomwe chipangizochi chingatengere mopanda ngozi.

L ndiye mtengo wa inductance ndipo iD ndiye chiwongolero chapano chomwe chikuyenda mu choyezera, chomwe chimasinthidwa mwadzidzidzi kuti chizikhetsa mu chipangizo choyezera. Mpweya wopangidwa ndi inductor umaposa mphamvu ya MOSFET yowonongeka ndipo izi zidzachititsa kuti chiwonongeko chiwonongeke. Pamene kuwonongeka kwa chigumukire kumachitika, zomwe zikuchitika mu inductor zidzadutsa mu chipangizo cha MOSFET ngakhale kutiMOSFETyazimitsa. Mphamvu zosungidwa mu inductor ndizofanana ndi mphamvu zosungidwa mu inductor yosokera ndikutayidwa ndi MOSFET.

Ma MOSFET akalumikizidwa mofanana, ma voltages osokonekera sakhala ofanana pakati pa zida. Chimene chimachitika nthawi zambiri ndi chakuti chipangizo chimodzi ndicho choyamba kukumana ndi kuwonongeka kwa chigumukire ndipo mafunde onse otsatizana ndi mafunde (mphamvu) amadutsa pa chipangizocho.

KHUTU - Mphamvu Yobwereza Chigumula

Mphamvu ya avalanche yobwerezabwereza yakhala "muyeso wa mafakitale", koma popanda kuyika mafupipafupi, zotayika zina ndi kuchuluka kwa kuzizira, chizindikiro ichi chilibe tanthauzo. Kutentha kwa kutentha (kuzizira) nthawi zambiri kumayang'anira mphamvu zobwerezabwereza. Zimakhalanso zovuta kuneneratu kuchuluka kwa mphamvu zomwe zimapangidwira chifukwa cha kuwonongeka kwa chigumukire.

Zimakhalanso zovuta kuneneratu kuchuluka kwa mphamvu zomwe zimapangidwira chifukwa cha kuwonongeka kwa chigumukire.

Tanthauzo lenileni la mavoti a EAR ndikuyesa mphamvu zobwerezabwereza zomwe chipangizochi chingathe kupirira. Tanthauzoli likuwonetsa kuti palibe malire pafupipafupi kuti chipangizocho chisawotche, zomwe ndi zenizeni pa chipangizo chilichonse chomwe chiwonongeko chikhoza kuchitika.

The Ndibwino kuyeza kutentha kwa chipangizocho chikugwira ntchito kapena kuzama kwa kutentha kuti muwone ngati chipangizo cha MOSFET chikutentha kwambiri panthawi yotsimikizira kapangidwe ka chipangizocho, makamaka pazida zomwe zingayambitse kuwonongeka kwa chigumukire.

IAR - Kuwonongeka kwa Avalanche Panopa

Pazida zina, chizolowezi cha m'mphepete mwa chip panthawi ya chigumula chimafuna kuti IAR yapano ikhale yochepa. Mwanjira iyi, mvula yamkuntho imakhala "chisindikizo chabwino" cha kusweka kwamphamvu kwamphamvu; zimawulula kuthekera kwenikweni kwa chipangizocho.

Gawo II Makhalidwe Amagetsi Okhazikika

V(BR)DSS: Mphamvu ya Drain-Source Breakdown Voltage (Destruction Voltage)

V(BR)DSS (yomwe nthawi zina imatchedwa VBDSS) ndi mphamvu yamagetsi yomwe madzi akuyenda mumtsinjewo amafika pamtengo wina wake pa kutentha kwina ndipo chipata chikafupika. Mphamvu ya drain-source pankhaniyi ndi voltage yowononga ma avalanche.

V(BR)DSS ndi chiwongolero cha kutentha kwabwino, ndipo pa kutentha kotsika V(BR)DSS imakhala yocheperapo kusiyana ndi mlingo wokwanira wa mphamvu ya drain-source pa 25°C. Pa -50°C, V(BR)DSS ndi yocheperapo kuposa mphamvu ya mphamvu ya drain-source pa -50°C. Pa -50°C, V(BR)DSS ndi pafupifupi 90% ya mphamvu ya mphamvu ya drain-source pa 25°C.

VGS(th), VGS(kuchoka): Mphamvu yamagetsi

VGS (th) ndi voteji yomwe magetsi owonjezera a chipata angapangitse kuti kukhetsa kuyambe kukhala kwaposachedwa, kapena kutha kutha pomwe MOSFET yazimitsidwa, ndi momwe kuyezedwera (drain current, drain source voltage, junction). kutentha) amatchulidwanso. Nthawi zambiri, zida zonse za MOS zipata zimakhala zosiyana

ma voltages adzakhala osiyana. Choncho, mitundu yosiyanasiyana ya VGS (th) imatchulidwa.MOSFETidzayatsa pamagetsi otsika kwambiri pachipata.

RDS (pa): Kukaniza

RDS(on) ndiye kukana kwa gwero la kukhetsa komwe kumayesedwa pamadzi enaake (nthawi zambiri theka la ID yapano), magetsi a gate-source, ndi 25°C. RDS(on) ndiye kukana kwa gwero la drainage komwe kumayezedwa padontho linalake (kawirikawiri theka la ID yapano), magetsi a gate-source, ndi 25°C.

IDSS: zero gate voltage drain current

IDSS ndi mphamvu yotayikira pakati pa kukhetsa ndi gwero pamagetsi enaake a drain-source pomwe magetsi a gate-source ali ziro. Popeza kutayikira kwaposachedwa kumawonjezeka ndi kutentha, IDSS imatchulidwa pazipinda zonse komanso kutentha kwambiri. Kutha kwa mphamvu chifukwa cha kutayikira kwapano kumatha kuwerengedwa pochulukitsa IDSS ndi voteji pakati pa magwero okhetsa, omwe nthawi zambiri amakhala osafunikira.

IGSS - Gate Source Leakage Current

IGSS ndiye kutayikira komwe kumadutsa pachipata pamagetsi enaake.

Gawo III Makhalidwe Amagetsi Amphamvu

Ciss : Mphamvu zolowetsa

The capacitance pakati pa chipata ndi gwero, kuyeza ndi chizindikiro cha AC mwa kufupikitsa kukhetsa kwa gwero, ndi mphamvu yolowera; Ciss imapangidwa polumikiza chipata cha drainage capacitance, Cgd, ndi chipata cha capacitance, Cgs, mofanana, kapena Ciss = Cgs + Cgd. Chipangizocho chimayatsidwa pamene mphamvu yolowera imayikidwa pamagetsi amagetsi, ndipo imazimitsidwa ikatulutsidwa kumtengo wina. Choncho, dalaivala dera ndi Ciss zimakhudza mwachindunji kutembenuka ndi kuzimitsa kuchedwa kwa chipangizocho.

Coss : Mphamvu zotulutsa

Mphamvu yotulutsa ndi mphamvu pakati pa kukhetsa ndi gwero loyezedwa ndi chizindikiro cha AC pamene gwero lachipata likufupikitsidwa, Coss imapangidwa ndi kufanana ndi ma CD a capacitance capacitance ndi chipata-drain capacitance Cgd, kapena Coss = Cds + Cgd. Pazosintha zofewa, Coss ndiyofunikira kwambiri chifukwa imatha kuyambitsa kumveka kozungulira.

Crss : Reverse Transfer Capacitance

Kuthekera kwake komwe kumayezedwa pakati pa kukhetsa ndi chipata chomwe chimachokera ndi kuthekera kosinthira. The reverse transfer capacitance ikufanana ndi gate drain capacitance, Cres = Cgd, ndipo nthawi zambiri amatchedwa Miller capacitance, yomwe ndi imodzi mwamagawo ofunikira kwambiri pakukwera ndi kugwa kwa switch.

Ndilo gawo lofunikira pakusintha kwanthawi yokwera ndi kugwa, komanso kumakhudzanso nthawi yochedwa kuzimitsa. The capacitance amachepetsa pamene kuda voteji ukuwonjezeka, makamaka linanena bungwe capacitance ndi n'zosiyana kusamutsa capacitance.

Qgs, Qgd, ndi Qg: Gate Charge

Mtengo wa chipata chikuwonetsa mtengo womwe wasungidwa pa capacitor pakati pa ma terminals. Popeza mtengo wa capacitor umasintha ndi voteji nthawi yomweyo kusintha, zotsatira za chipata nthawi zambiri zimaganiziridwa popanga mabwalo oyendetsa zipata.

Qgs ndi chiwongola dzanja kuchokera ku 0 kupita kumalo oyamba osinthira, Qgd ndi gawo loyambira poyambira mpaka lachiwiri (lotchedwanso "Miller"), ndipo Qg ndi gawo lochokera ku 0 mpaka pomwe VGS imafanana ndi galimoto inayake. Voteji.

Kusintha kwa kutayikira panopa ndi kutayikira gwero voteji ali ndi zotsatira pang'ono pa mtengo mtengo pachipata, ndi chipata mlandu sasintha ndi kutentha. Zoyeserera zafotokozedwa. Chithunzi cha chipata cha chipata chikuwonetsedwa mu pepala la data, kuphatikizirapo ma curve ofananira ndi ma curve a chipata cha kutayikira kosasunthika komanso kutulutsa kwamagetsi kosiyanasiyana.

Ma curve ofananira ndi ma curve a chitseko cha drain current ndi ma drain source voltage amaphatikizidwa mu datasheet. Pa graph, mphamvu yamagetsi ya VGS(pl) imachulukirachulukira ndikuwonjezeka kwapano (ndikutsika ndi kutsika kwapano). Mphamvu yamagetsi yamapiri imakhalanso yofanana ndi mphamvu yamagetsi, kotero kuti voteji yosiyana imapanga magetsi osiyana.

Voteji.

Chojambula chotsatirachi ndi chatsatanetsatane komanso chogwiritsidwa ntchito:

td (pa) : nthawi yochedwa nthawi

Nthawi yochedwa pa nthawi ndi nthawi yochokera pamene magetsi a magetsi amakwera kufika pa 10% ya magetsi a gate drive mpaka pamene kutayikira kumakwera kufika pa 10% ya panopa.

td(off): Nthawi yochedwa

Nthawi yochedwa yotsekera ndi nthawi yomwe idadutsa kuchokera pomwe chipata chamagetsi chimatsika mpaka 90% yamagetsi oyendetsa pachipata mpaka pomwe kutayikira kwapano kumatsikira mpaka 90% yazomwe zatchulidwa. Izi zikuwonetsa kuchedwetsa komwe kumachitika pakali pano kusamutsidwa ku katundu.

tr: Nthawi Yokwera

Nthawi yokwera ndi nthawi yomwe imatengera kuti kukhetsa kwapano kukwera kuchoka pa 10% mpaka 90%.

tf : Nthawi yakugwa

Nthawi yakugwa ndi nthawi yomwe imatengera kuti kukhetsa kwapano kugwe kuchokera pa 90% mpaka 10%.