UC2843BD1013TR ic chip Integrated circuits semiconductor yatsopano komanso yoyambirira malo amodzi kugula

1.LDO, kapena low dropout regulator, ndi chowongolera chotsika chotsika chomwe chimagwiritsa ntchito transistor kapena field effect chubu (FET) yomwe imagwira ntchito m'dera lake la saturation kuti ichotse ma voltage ochulukirapo pamagetsi omwe amagwiritsidwa ntchito kuti apange voteji yoyendetsedwa bwino.
Zinthu zinayi zazikulu ndi Dropout, Noise, Power Supply Rejection Ratio (PSRR), ndi Quiscent Current Iq.
Zigawo zazikuluzikulu: gawo loyambira, gawo lokhazikika lomwe limayambira nthawi zonse, gawo lothandizira, kusintha zinthu, gwero lachidziwitso, chokulitsa cholakwika, network resistor network ndi chitetezo, etc.

2. Mfundo Yoyendetsera Ntchito
Dera loyambira la LDO lili ndi VT yowongolera, zitsanzo zotsutsa R1 ndi R2, ndi amplifier yofananira A.
Dongosolo limayatsidwa, ngati pini yolumikizira ili pamtunda, dera limayamba, mayendedwe apano omwe amachokera nthawi zonse amapereka kukondera kudera lonselo, voliyumu yowunikira imakhazikitsidwa mwachangu, ndipo voteji yosayendetsedwa bwino imagwiritsidwa ntchito ngati voteji. pamagetsi, voteji yowunikira imagwiritsidwa ntchito ngati gawo loyikirapo voteji ya cholakwika amplifier, netiweki ya resistor imagawaniza voteji ndikupeza voliyumu yoyankha, voteji iyi imalowetsedwera kumalo omwewo ofananitsa zolakwika, ndi zoipa Magetsi amayankhidwewa amalowetsa ku mbali ya isotropic ya comparator yolakwika ndikuyerekeza ndi voteji yolakwika.Kusiyanitsa pakati pa ma voltages awiri kumakulitsidwa ndi chokulitsa cholakwika kuti chiwongolere chipata cha chinthu chosinthira mphamvu, ndipo kutulutsa kwa LDO kumayendetsedwa ndikusintha mawonekedwe a chubu chosinthira, mwachitsanzo, Vout = (R1 + R2)/ R2 × Vref
Chowongolera chotsika chotsika kwambiri chimakhalanso ndi ntchito zina monga chitetezo chafupipafupi, kutseka kwamagetsi, kutsekeka kwamafuta, chitetezo cholumikizira kumbuyo, ndi zina zambiri.

3.Ubwino, kuipa, komanso momwe alili pano
Low Dropout Voltage (LDO) linear regulators ndi otsika mtengo, phokoso laling'ono, otsika quiescent panopa, zochepa zigawo zikuluzikulu zakunja, kawirikawiri mmodzi kapena awiri bypass capacitor, ndipo ali ndi phokoso lochepa kwambiri ndi mkulu Mphamvu Supply Rejection Ratio (PSRR).LDO ndi kachitidwe kakang'ono pa Chip (SoC) komwe kumangodzigwiritsa ntchito motsika kwambiri.Itha kugwiritsidwa ntchito pakuwongolera mayendedwe apano ndipo imakhala ndi ma mayendedwe ophatikizika a hardware monga ma MOSFET okhala ndi kutsika kwambiri pa intaneti, ma Schottky diode, ma sampling resistors, ndi zogawa ma voltage, komanso chitetezo chanthawi yayitali, chitetezo chopitilira muyeso, magwero olondola ofotokoza, ma amplifiers osiyana, ochedwetsa, ndi zina zotero. PG ndi mbadwo watsopano wa LDO ndi kudziyesa kwa boma lililonse linanena bungwe ndi kuchedwa otetezedwa magetsi, amene angatchedwenso Mphamvu Good, mwachitsanzo "mphamvu zabwino kapena mphamvu khola" .Ma LDO ambiri amafunikira capacitor imodzi yokha pakulowetsa ndi imodzi pazotulutsa kuti igwire bwino ntchito.
Ma LDO atsopano atha kukwaniritsa izi: phokoso lotulutsa 30µV, PSRR la 60dB, 6µA yatsopano, ndi kutsika kwamagetsi kwa 100mV yokha.Chifukwa chachikulu chakuchita bwino kwa owongolera ma linear a LDO ndikuti chowongolera chomwe chimagwiritsidwa ntchito ndi P-channel MOSFET, yomwe imakhala yoyendetsedwa ndi magetsi ndipo imasowa pakali pano, kuchepetsa zomwe zimagwiritsidwa ntchito ndi chipangizocho komanso kutsika kwamagetsi kudutsa.dontho ndi pafupifupi wofanana ndi mankhwala a linanena bungwe panopa ndi pa-kukana.Kutsika kwamagetsi kudutsa MOSFET ndikotsika kwambiri chifukwa chokana kukana.Owongolera mizere wamba amagwiritsa ntchito PNP transistors.M'mabwalo okhala ndi ma transistors a PNP, kutsika kwamagetsi pakati pa kulowetsa ndi kutulutsa sikuyenera kukhala kotsika kwambiri kuti kulepheretsa PNP transistor kuti isapitirire ndikuchepetsa kutulutsa.