I-STMicroelectronics L7987L I-Asynchronous Switching
Izilawuli zokushintsha ze-DC-DC ziyindlela ephumelela kakhulu yokuguqula ivolumu eyodwa ye-DCtage komunye. Ngisho noma inkimbinkimbi futhi ibiza kakhulu kunezilawuli ezilandelanayo, ukuguquguquka okwengeziwe nokusebenza kahle okuphakeme kube nomthelela ekudumeni kokushintsha izilawuli. Lo mhlahlandlela uhlinzeka onjiniyela nge-overview yezilawuli zethu zokushintsha ezisetshenziswa kakhulu futhi zizosiza ukukhomba isisombululo esifanele kakhulu sohlobo ngalunye lohlelo lokusebenza.
KUNGANI KUSHINTSHWA IZILAWULI ?
Ukusebenza kahle
Ngenkathi izilawuli zomugqa zihlala zidumile ngenxa yomsindo wazo ophansi, ubulula, kanye nosayizi omncane, isizathu esiyinhloko sokuqalisa isilawuli esishintshayo ukukhulisa ukusebenza kahle kohlelo lokusebenza. Nakuba amandla alahlekile kumthethonqubo womugqa alahleka ngokuqondile kumandla engeziwe ahlakazwa njengokushisa, ukulahlekelwa kwamandla kuzilawuli ezishintshayo kubangelwa kuphela amaza amancane achemile kanye nokulahlekelwa ezingxenyeni ezingafanelekile. Kumklamo owenziwe kahle, ukusebenza kahle kungaba ngaphezu kwama-95% phezu kwezimo eziningi zokusebenza.
Ukuvumelana nezimo
Isicelo esiyinhloko sezilawuli ze-DC-DC ukwehliswa kwevolumu ephezulu yokufakatage kuya kuvolumu ephansi yokukhiphayotage, kodwa ngenxa yendlela yokusebenza kwazo izilawuli eziningi zingalungiselelwa ukusebenza neziphumayo ezingaba phezulu kunokokufaka kwazo, noma ziguqule ivolumu yokufaka.tagama-es aphakeme futhi aphansi kunomthamo wokukhiphayotage.
Lezi zihloko ezintathu eziyinhloko zibizwa ngokuthi i-Buck, Boost, ne-Buck-Boost.
Buck
- I-topology evame kakhulu
- Kusetshenziswa uma okokufaka kungaphezulu kokuphumayo
- Njengoba izilawuli eziningi ezikhona zenzelwe le njongo, izixazululo ziningi, zilula futhi zithuthukiswe kahle
Buck-boost
- I-Buck-boost topology isetshenziswa lapho ivolthi yokufakatagu-e kulindeleke ukuthi abe phezulu futhi abe ngaphansi kwevolumu yokuphumayotage ngesikhathi sokusebenza
- Lokhu, ngokwesiboneloampi-le, ivela kumasekhethi asebenza ngebhethri, lapho i-voltagi-e yebhethri egcwele amandla ingaba phezulu kunalokho okudingekayo, kuyilapho ivolumutage kancane kancane iba phansi kakhulu njengoba ibhethri liphuma
Thuthukisa
- I-Boost (step-up) topology iguqula ivolumu ephansi yokufakatage kuya kuvolumu ephezulu yokuphumayotage
- Lokhu kuvame ukubonakala kumadivayisi aphathwayo futhi agqokekayo lapho umthamo ophumayotagU-e ulindeleke ukuthi abe phezulu kunomthamo wokufakatage, nokusebenzisa amabhethri amaningi ochungechungeni kuthathwa njengokukhulu kakhulu
NGINGASIKHETHA KANJANI ISILAWULI SOKUSHINTSHWA KWE-DC-DC ESIFANELE SOKWENZA ISICELO?
Nakuba ezinye izinhlelo zokusebenza zingase zidinge ukunakwa okwengeziwe ezicini ezithile, indlela ejwayelekile yokukhetha isilawuli sokushintshwa kwe-DC-DC iwukufanisa imibandela ngohlelo olulandelayo:
- I-Galvanic isolated DC kuya ku-DC regulation
- Okokufaka ivoltagi-e range kanye ne-output voltage (ilungisiwe noma iyalungiseka)
- Imfuneko yamanje yomthwalo
- Ukusebenza kahle nokuthula
- Ukulungisa izakhiwo
- Ukushintsha imvamisa
- Isinxephezelo
- Ukunemba komphumela
- Izici ezingeziwe (Vumela, Isiqalo Esithambile, I-Power Good, njll.)
Kubalulekile ukuthi isilawuli sikwazi ukusebenza nge-voltage edingekayo yokufaka nokuphumayotages; amanye amadivaysi ane-fixed output voltages, kuyilapho eziningi zilungiseka. Kuye nge-input/output voltage relation, kuzosetshenziswa ama-topology ahlukene,
njenge-Buck/Boost/Buck-Boost topology.
Umkhawulo ophumayo wamanje
Umlawuli kudingeka akwazi ukuhlinzeka ngomthwalo ngendlela efanele. Imajini ephezulu iyanconywa ukuze kuzuzwe ukusebenza kahle komkhiqizo.
Ukusebenza kahle nokuthula
Iphuzu eliyinhloko lokuthengisa le-switching regulator ukusebenza kahle kwayo. Nakuba isilawuli esikahle singaguqula amandla ngaphandle kokulahlekelwa, isilawuli sangempela sizoba nokulahlekelwa okuthile okubangelwa izici ezifana nezinkomba zangaphakathi, ukusebenza kwamaswishi, kanye nokuhlakazeka okubangelwa ama-parasites aphikisayo emithonjeni nasezintweni. Umsinga othuleyo uyimanje odingekayo ukuze usebenzise isilawuli.
Ukulungisa izakhiwo
Ukushintsha izilawuli kuphakathi kokuthi ku-asynchronous noma ku-synchronous, okusho ukuthi, ngokulandelana, bane-diode yokubamba yangaphandle noma into yangaphakathi yokudlula yesibili. Ngokuvamile inketho yokuvumelanisa ithuthukisa ukusebenza kahle kuyilapho inciphisa indawo edingekayo ku-PCB. Ngakolunye uhlangothi, ukwakheka kwe-asynchronous kubiza kancane, futhi i-diode yangaphandle ivumela ukuchithwa kokushisa endaweni enkulu.
Ukushintsha imvamisa
Imvamisa yokushintsha nokusebenza kahle kuhlobene ngokuqondile, futhi kuphinde kuthinte umsindo, usayizi kanye nezindleko zesilawuli.
Imvamisa yokushintsha ephezulu isho ukuthi ama-inductors amancane nezinye izisetshenziswa zingasetshenziswa, kodwa futhi kuzongenisa ukusetshenziswa kwamandla okuphezulu futhi kwenyuse imisebe ye-EM. Nakuba abanye abalawuli banamaza amisiwe, ukuze umklami akwazi ukuthunga
umlawuli esicelweni.
Isinxephezelo
Isinxephezelo sisho impendulo kanye namanethiwekhi esinxephezelo agcina isilawuli sizinzile. Kwabanye abalawuli, lezi zingaphandle futhi zivumela ukwenziwa ngokwezifiso kanye nemiklamo eguquguqukayo; kuyilapho abanye abalawuli beshumeke amanethiwekhi esinxephezelo afaka isandla ekwakhiweni okulula nokuhlangene.
Ukunemba
Ukunemba ukwehluka kwevolumu yokuphumayotage ngokuphathelene nethagethi edingekayo voltage. Ukunemba kokukhiphayo sekukonke kuhlanganisa nokuhlukahluka okubangelwa izinguquko zomugqa nokulayisha.
Umthethonqubo wangaphambili (>24 V)
Qaphela: * iyathuthukiswa, ** ye-USB PD, amandla aphumayo afika ku-60 W (20 V, 3 A)
I-post-Regulation (<24 V)
Qaphela: * isathuthukiswa
Qaphela: * ngaphansi kokuthuthukiswa
Amadokhumenti / Izinsiza
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I-STMicroelectronics L7987L I-Asynchronous Switching Regulator [pdf] Umhlahlandlela Womsebenzisi I-BR2209DCDCQR, L7987L, L7987L I-Asynchronous Switching Regulator, I-Asynchronous Switching Regulator, Isilawuli Sokushintsha, Isilawuli |
