3-A Synchronous Kauj ruam-Down Voltage Converter Integrated Circuit Court IC LMR33630BQRNXRQ1

1.

Lub luag haujlwm ntawm lub phaw converter yog los txo cov input voltage thiab phim nws rau lub load.Lub hauv paus topology ntawm lub phaw converter muaj xws li lub ntsiab hloov thiab lub diode hloov siv thaum lub sij hawm so.Thaum lub MOSFET txuas nrog rau kev sib txuas nrog lub diode txuas ntxiv, nws hu ua synchronous puck converter.Qhov kev ua tau zoo ntawm cov phaw converter layout no yog siab dua li yav dhau los phaw converters vim yog kev sib txuas ntawm qhov qis-sab MOSFET nrog Schottky diode.Daim duab 1 qhia tau hais tias ib tug schematic ntawm ib tug synchronous buck converter, uas yog cov feem ntau layout siv nyob rau hauv lub desktop thiab laptop computers hnub no.

2.

Txoj kev suav yooj yim

Lub transistor hloov Q1 thiab Q2 yog ob qho tib si N-channel zog MOSFETs.ob lub MOSFET no feem ntau yog hu ua high-sab los yog qis-sab keyboards thiab qis-sab MOSFET txuas nrog nyob rau hauv parallel nrog Schottky diode.Ob lub MOSFETs thiab lub diode tsim lub ntsiab lub zog channel ntawm lub converter.Kev poob hauv cov khoom no kuj yog ib feem tseem ceeb ntawm kev poob tag nrho.Qhov loj ntawm cov zis LC lim tuaj yeem txiav txim siab los ntawm ripple tam sim no thiab ripple voltage.Nyob ntawm qhov tshwj xeeb PWM siv nyob rau hauv txhua rooj plaub, cov lus tawm tswv yim resistor tes hauj lwm R1 thiab R2 tuaj yeem xaiv tau thiab qee cov khoom siv muaj lub luag haujlwm rau kev teeb tsa cov zis hluav taws xob.PWM yuav tsum raug xaiv raws li lub zog theem thiab kev ua haujlwm ntawm qhov xav tau ntau zaus, uas txhais tau hais tias thaum muaj ntau zaus, yuav tsum muaj peev xwm tsav txaus los tsav lub rooj vag MOSFET, uas yog qhov tsawg kawg nkaus ntawm cov khoom yuav tsum tau ua. rau tus qauv synchronous phaw converter.

Tus tsim qauv yuav tsum xub xyuas qhov yuav tsum tau ua, piv txwv li V tawm tswv yim, V tso zis thiab kuv cov zis raws li qhov yuav tsum tau ua haujlwm kub.Cov kev cai yooj yim no yog tom qab ntawd ua ke nrog lub zog khiav, zaus, thiab lub cev qhov loj me uas tau txais.

3.

Lub luag haujlwm ntawm buck-boost topologies

Buck-boost topologies yog qhov ua tau zoo vim tias cov khoom siv hluav taws xob tuaj yeem ua me me, loj dua, lossis tib yam li cov zis hluav taws xob thaum xav tau lub zog tso zis ntau dua 50 W. Rau cov zis hluav taws xob tsawg dua 50 W, ib leeg-kawg thawj inductor converter (SEPIC ) yog ib qho kev xaiv zoo dua vim nws siv cov khoom tsawg dua.

Buck-boost converters ua haujlwm nyob rau hauv hom phaw thaum lub input voltage ntau dua li qhov tso zis voltage thiab nyob rau hauv boost hom thaum lub input voltage tsawg tshaj li qhov tso zis voltage.Thaum lub converter ua hauj lwm nyob rau hauv ib cheeb tsam kis tau tus mob nyob rau hauv lub input voltage nyob rau hauv lub output voltage ntau, muaj ob lub tswv yim rau kev soj ntsuam nrog cov xwm txheej no: tog twg los lub puck thiab boost theem yog active nyob rau tib lub sij hawm, los yog lub switching cycles alternate ntawm puck. thiab boost theem, txhua qhov feem ntau ua haujlwm ntawm ib nrab ntawm qhov hloov pauv zaus.Lub tswv yim thib ob tuaj yeem ua rau lub suab nrov nrov ntawm qhov tso zis, thaum qhov tso zis hluav taws xob qhov tseeb yuav tsis tshua muaj tseeb piv rau cov pa phaw los yog txhawb kev ua haujlwm, tab sis lub converter yuav ua tau zoo dua piv rau thawj lub tswv yim.