STMicroelectronics L7987L Asynchronous Switching
Li-switch regulator tsa DC-DC ke tsona tse sebetsang hantle ka ho fetesisa tsa ho fetolela voltage ho e mong. Esita le haeba e rarahane ebile e theko e boima ho feta li-linear regulators, ho feto-fetoha ha maemo le ho sebetsa ka mokhoa o phahameng ho tlatselitse ho tumeng ha li-switching regulators. Tataiso ena e fa bahlahisi monyetla oa ho fetaview ea balaoli ba rona ba li-switching tse sebelisoang haholo 'me e tla thusa ho tseba tharollo e nepahetseng ka ho fetisisa bakeng sa mofuta o mong le o mong oa kopo.
KE HOBANE'NG HA HO FETOHA LI-REGULATOR ?
Katleho
Le hoja li-linear regulator li ntse li tsebahala ka lebaka la lerata la tsona le tlaase, bonolo, le boholo bo fokolang, lebaka le ka sehloohong la ho kenya ts'ebetsong ea switching regulator ke ho eketsa ts'ebetso ea kopo. Le hoja matla a lahlehileng molaong o ts'oanelang a lahleheloa ka ho toba ho matla a feteletseng a felloang ke mocheso, tahlehelo ea matla ho li-switching regulator e bakoa feela ke maqhubu a manyenyane a leeme le tahlehelo likarolong tse sa lokelang. Ka moralo o entsoeng hantle, katleho e ka ba ho feta 95% ho feta maemo a mangata a sebetsang.
Ho tenyetseha
Kopo ea mantlha bakeng sa balaoli ba DC-DC ke ho theola phallo e phahamengtage ho ea bophahamong bo tlase ba tlhahisotage, empa ka lebaka la mokhoa oa bona oa ts'ebetso, balaoli ba bangata le bona ba ka hlophisoa hore ba sebetse ka liphetho tse ka bang holimo ho feta tlhahiso ea bona, kapa esita le ho fetolela matla a ho kenya.tagli-e tse phahameng le tse tlase ho feta phallo ea molumotage.
Li-topology tsena tse tharo tsa mantlha li bitsoa Buck, Boost, le Buck-Boost.
Buck
- The atileng ka ho fetisisa topology
- E sebelisoa ha tlhahiso e phahame ho feta tlhahiso
- Kaha boholo ba balaoli ba teng ba etselitsoe morero ona, litharollo li ngata, li bonolo ebile li ntlafalitsoe hantle
Buck-boost
- Buck-boost topology e sebelisoa ha ho kenya molumotage lebeletsoe hore e be holimo le ka tlase ho palo ea tlhahisotage nakong ea ts'ebetso
- Sena, mohlalaample, e hlaha lipotolohong tse sebelisoang ke betri, moo voltage ka ba e phahameng ho feta kamoo e hlokehang kateng, ha voltagbutle-butle e ba tlase haholo ha betri e tsoa
Matlafatsa
- Boost (ho nyoloha) topology e fetola molumo o tlase oa tlhahisotage ho ea bophahamong bo phahameng ba tlhahisotage
- Hangata sena se bonoa lisebelisoa tse ts'oaroang ka letsoho le tse ka roaloang moo tlhahiso e leng tengtage ntse e lebeletsoe hore e be holimo ho feta bophahamo ba modumotage, 'me ho sebelisa libeteri tse ngata ka letoto ho nkoa e le ngata haholo
KE KHETHA JOANG MOLAOLI OA SWICHING WA DC-DC BAKENG SA KOPO?
Le ha lits'ebetso tse ling li ka hloka tlhokomelo e kholo ho litšoaneleho tse ikhethileng, mokhoa o akaretsang oa ho khetha molaoli oa switjha oa DC-DC ke ho tsamaisana le litekanyetso ka tatellano e latelang:
- Galvanic e arohaneng le DC ho ea ho taolo ea DC
- Keletso voltage range le tlhahiso voltage (e tsitsitseng kapa e ka fetoloa)
- Tlhokahalo ea hona joale ea mojaro
- Katleho le khutso
- Moralo oa ho lokisa
- Ho fetola maqhubu
- Matšeliso
- Ho nepahala ha sephetho
- Likarolo tse ling (Noble, Soft-start, Power Good, joalo-joalo)
Ho bohlokoa hore molaoli a ka sebetsa ka phallo e batloang le tlhahisotages; lisebelisoa tse ling li na le tlhahiso e tsitsitseng ea voltages, athe tse ngata li khona ho fetoha. Ho ipapisitsoe le sephetho/se hlahisoang ke matlatagho tla sebelisoa li-topology tse fapaneng,
joalo ka li-topology tsa Buck/Boost/Buck-Boost.
Boholo ba tlhahiso ea hajoale
Molaoli o hloka ho khona ho fana ka mojaro ka nepo. Ho kgothaletswa hore ho be le tekanyo e phahameng ka ho fetisisa bakeng sa ho finyella tshebetso e ntle ya sehlahiswa.
Katleho le khutso
Ntho e ka sehloohong ea ho rekisa ea switching regulator ke bokhoni ba eona. Le hoja molaoli ea loketseng a ka fetola matla ntle le tahlehelo, molaoli oa 'nete o tla ba le tahlehelo e bakoang ke lintlha tse kang litšupiso tse ka hare, ts'ebetso ea li-switches, le ho senya ho bakoang ke likokoana-hloko tse hanyetsang mesaletsa le likaroloana. Nako e khutsitseng ke ea hajoale e hlokahalang ho sebetsa regulator.
Moralo oa ho lokisa
Li-switch regulators li na le li-asynchronous kapa li-synchronous, ho bolelang hore bona, ka ho latellana, ba na le diode ea ka ntle ea ho tšoasa kapa ntho ea ka hare ea bobeli ea ho feta. Ka tloaelo khetho ea synchronous e ntlafatsa ts'ebetso ha e ntse e fokotsa sebaka se hlokahalang ho PCB. Ka lehlakoreng le leng, mohaho oa asynchronous ha o theko e tlaase, 'me diode e ka ntle e lumella ho senya mocheso sebakeng se seholoanyane.
Ho fetola maqhubu
Maqhubu a ho fetola le ho sebetsa hantle a amana ka ho toba, hape a ama lerata, boholo le litšenyehelo tsa molaoli.
Maqhubu a phahameng a ho fetoha a bolela hore li-inductors tse nyane le li-passive tse ling li ka sebelisoa, empa hape li tla kenya ts'ebeliso e phahameng ea matla le ho eketsa mahlaseli a EM. Le hoja balaoli ba bang ba na le maqhubu a tsitsitseng, e le hore moqapi a khone ho lokisa
molaoli oa kopo.
Matšeliso
Matšeliso a bua ka maikutlo le marang-rang a matšeliso a bolokang molaoli a tsitsitse. Bakeng sa balaoli ba bang, tsena ke tsa ka ntle 'me li lumella ho iketsetsa le meralo e feto-fetohang; athe balaoli ba bang ba kentse marang-rang a matšeliso a kenyang letsoho meralong e bonolo le e kopaneng.
Ho nepahala
Ho nepahala ke phapang ea phallo ea molumotage mabapi le sepheo se lakatsehang voltage. Ho nepahala ha tlhahiso ka kakaretso ho boetse ho kenyelletsa phapang e bakoang ke line le liphetoho tsa mojaro.
Taolo ea pele (> 24 V)
Hlokomela: * e ntse e ntlafatsoa, ** bakeng sa USB PD, matla a fihlang ho 60 W (20 V, 3 A)
Taolo ea ka morao (<24 V)
Hlokomela: * tlasa ntshetsopele
Hlokomela: * tlasa ntshetsopele
Litokomane / Lisebelisoa
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STMicroelectronics L7987L Asynchronous Switching Regulator [pdf] Bukana ea Mosebelisi BR2209DCDCQR, L7987L, L7987L Asynchronous Switching Regulator, Asynchronous Switching Regulator, Switching Regulator, Regulator |
