Hauv cov khoom siv hluav taws xob, kev siv hluav taws xob ruaj khov yog qhov tseem ceeb rau kev ua kom ntseeg tau qhov system ua haujlwm. Hloov cov khoom siv hluav taws xob (DC-}DC) tau dhau los ua cov kev daws teeb meem loj hauv cov khoom siv hluav taws xob, kev tswj hwm kev lag luam, cov khoom siv sib txuas lus, thiab lwm yam kev lag luam vim lawv qhov zoo ntawm kev ua haujlwm siab, compact loj, thiab dav input voltage ntau. Ntawm cov no, kev xaiv ntawm cov khoom siv peripheral thiab PCB layout ncaj qha txiav txim siab qhov tseeb tso zis, ripple tswj, thermal ua haujlwm, thiab ntev -lub sij hawm ruaj khov ntawm DC- DC fais fab mov.
Cov ntsiab lus tseem ceeb ntawm DC -DC Hloov Cov Khoom Siv Hluav Taws Xob
1.Dab tsi yog DC -DC Switching Power Supply?
DC -DC hloov hluav taws xob yog lub zog hluav taws xob hluav taws xob uas hloov cov khoom siv hluav taws xob DC los ntawm "switching of transistors." Nws lub luag haujlwm tseem ceeb yog los hloov qhov tsis ruaj khov input voltage (piv txwv li, 12V) rau hauv qhov chaw tso zis ruaj khov uas yuav tsum tau muaj los ntawm kev thauj khoom (piv txwv li, 5V), thaum tseem muab cov peev txheej xws li voltage theem- nce / kauj ruam- nqis, kev tswj tam sim no, thiab suab nrov. Piv nrog rau cov kab hluav taws xob regulators (LDOs), DC-DC hloov cov khoom siv hluav taws xob muaj kev ua haujlwm siab dua (feem ntau 80%-95%) thiab tsim nyog rau high-tam sim no (xws li, 6A) thiab dav input voltage scenarios.
2.Txoj Cai Ua Haujlwm ntawm DC-DC
Ua ib qho classic DC-DC converter ua piv txwv, sab laug suav nrog cov tswv yim pins xws li Pab (EN), Soft Start/Tracking (SS/TR), Default Settings (DEF), thiab Switching Frequency (FSW). Cov teeb liab no dhau los ntawm kev tswj cov logic module, uas ua ke nrog kev tiv thaiv thiab kev tswj xyuas xws li pib muag muag, thermal shutdown, undervoltage lockout (UVLO), thiab Power Good (PG) tswj, tsav lub zog tswj module. Lub zog tswj module siv lub rooj tsav tsheb thiab siab -sab / qis- sab tam sim no txwv kev sib piv (HS lim, LS lim) los tswj cov hluav taws xob sab sauv thiab qis, ua kom muaj zog hloov pauv. DCS-Control ™ seem hauv qab ua cov lus tawm tswv yim los ntawm kev ua yuam kev amplifier, kev them nyiaj nqes nqes, kev sib piv, thiab timer. Sab xis muaj xws li kev sib txuas xws li lub zog tawm tswv yim (PVIN, AVIN), hauv av (AGND, PGND), thiab hloov cov zis (SW), sib sau ua tau zoo DC-DC hloov dua siab tshiab thiab tswj tau meej.
3.Lub hauv paus ntawm DC-DC dag nyob rau hauv "Switching - Zog Cia - Lim" voj voog:
Hloov theem:
Sab hauv MOSFET hloov pauv (siab-sab HS-FET thiab qis- sab LS-FET) tig rau thiab tawm ua ke, "chopping" input DC voltage rau hauv siab -frequency pulse voltage.
Zog Cia Theem:
Lub inductor khaws lub zog thaum hloov pauv, thiab lub capacitor smoothens cov mem tes voltage.
Output theem:
Lub tswv yim Circuit Court saib xyuas cov zis hluav taws xob hauv lub sijhawm tiag tiag thiab kho qhov hloov pauv ntawm / tawm lub sijhawm (lub voj voog ua haujlwm) kom xa cov khoom tso tawm ruaj khov.
4.Key Performance Indicators
Input / Output Voltage Ntau Yam:Lub input voltage yuav tsum phim lub nti lub siab ntev, thaum cov zis voltage yuav tsum tau raws li lub load (xws li, ib tug tej yam DC-DC txhawb 5.5V-18V input thiab 0.611V-15V tso zis).
Cov zis tam sim no:Qhov siab tshaj plaws tso zis tam sim no yuav tsum npog lub load lub ncov tam sim no (piv txwv li, ib qho 6A load yuav tsum muaj lub nti nrog Ntau dua lossis sib npaug rau 6A tso zis muaj peev xwm).
Hloov zaus:Ntau zaus tso cai rau me me inductor thiab capacitor qhov ntau thiab tsawg tab sis nce kev hloov pauv (feem ntau zaus ntawm 200kHz txog 1MHz, yuav tsum muaj qhov sib npaug ntawm qhov ua tau zoo thiab qhov loj me).
Qhov Voltage Ripple:Tus nqi hloov pauv ntawm qhov tso zis hluav taws xob (cov ntawv thov kev lag luam feem ntau xav tau tsawg dua lossis sib npaug li 20mV; ntau dhau ripple tuaj yeem cuam tshuam nrog cov kab hluav taws xob rhiab).
Kev ua tau zoo:Qhov ratio ntawm cov zis zog rau input zog. Kev ua haujlwm siab dua txo cov kev ntxhov siab thermal.
