UC2843BD1013TR ic chip yakabatanidzwa dunhu remagetsi semiconductor nyowani uye yepakutanga imwe nzvimbo tenga

1.Iyo LDO, kana yakaderera dropout regulator, ndeye yakaderera yekudonha mutsara mutsara unoshandisa transistor kana field effect chubhu (FET) inoshanda munzvimbo yayo yekusatutsira kubvisa yakawandisa voltage kubva kune yakashandiswa yekupinza voltage kuburitsa yakadzorwa inobuda voltage.
Zvinhu zvina zvikuru ndezvokudonhedza, ruzha, Power Supply Rejection Ratio (PSRR), uye Quiscent Current Iq.
Izvo zvikuru zvikamu: kutanga dunhu, inogara iripo ikozvino sosi bias unit, inogonesa dunhu, inogadzirisa chinhu, referensi sosi, kukanganisa amplifier, mhinduro resistor network uye kudzivirira wedunhu, nezvimwe.

2.Kushanda Musimboti
Iyo LDO yakakosha dunhu ine yakatevedzana regulator VT, sampling resistors R1 uye R2, uye kuenzanisa amplifier A.
Iyo sisitimu inokwidziridzwa kumusoro, kana pini yekugonesa iri padanho repamusoro, dunhu rinotanga, iyo inogara iripo sosi yedunhu inopa kurerekera kudunhu rese, iyo referensi sosi voltage inogadzikiswa, uye iyo isina kudzorwa yekuisa voltage inoshandiswa semagetsi. yemagetsi emagetsi, iyo referensi voltage inoshandiswa seyakashata chikamu chekuisa voltage yeye kukanganisa amplifier, iyo resistor mhinduro network inokamura inobuda voltage uye inowana iyo voltage yemhinduro, iyi voltage yemhinduro inoiswa kune imwechete nzira terminal yemuenzanisi wekukanganisa, uye iyo isina kunaka Iyi voltage yemhinduro inoiswa kune isotropic divi remuenzanisi wekukanganisa uye nekuenzaniswa neiyo negative reference voltage.Musiyano uripo pakati pemavoltages maviri unokwidziridzwa nekukanganisa amplifier kudzora zvakananga gedhi resimba rekugadzirisa simba, uye kubuda kweLDO kunodzorwa nekushandura mamiriro ekufambisa kwechubhu inogadzirisa, kureva Vout = (R1 + R2)/ R2 × Vref
Iyo chaiyo yakaderera yekudonhedza linear regulator inewo mamwe mabasa akadai seyekuremedza pfupi dunhu kudzivirira, overvoltage shutdown, thermal shutdown, reverse yekubatanidza kuchengetedza, nezvimwe.

3.Zvakanakira, zvazvakaipira, uye chimiro chazvino
Low Dropout Voltage (LDO) linear regulators mutengo wakaderera, wakaderera ruzha, wakaderera quiescent ikozvino, mashoma ekunze zvikamu, kazhinji kamwechete kana maviri bypass capacitor, uye ane yakaderera kwazvo ruzha uye yakakwira Power Supply Rejection Ratio (PSRR).Iyo LDO idiki Sisitimu paChip (SoC) ine yakaderera kwazvo yekuzvidyira.Inogona kushandiswa kune yazvino chiteshi chekutonga uye yakabatanidza Hardware maseketi akadai seMOSFET ane yakaderera-mumutsara pa-resistance, Schottky diodes, sampling resistors, uye voltage dividers, pamwe nepamusoro-ikozvino kuchengetedzwa, pamusoro-tembiricha yekudzivirira, precision reference sources, differential amplifiers, delayers, etc. The PG chizvarwa chitsva cheLDO ine self-test kune imwe neimwe inobuda mamiriro uye inononoka yakachengeteka magetsi ekupa, iyo inogonawo kunzi Power Good, kureva "simba rakanaka kana simba rakagadzikana" .MaLDO mazhinji anongoda capacitor imwe chete pane yekuisa uye imwe pane inobuda kuti ishande yakagadzikana.
MaLDO matsva anogona kuita zvinotevera: ruzha rwekubuda kwe30µV, PSRR ye60dB, runyararo rwe6µA, uye kudonha kwemagetsi kwe100mV chete.Chikonzero chikuru chekuvandudzwa kwekuita kweLDO linear regulators ndechekuti regulator inoshandiswa iP-channel MOSFET, inofambiswa nevoltage uye haidi zvazvino, ichidzikisa ikozvino inopedzwa nemudziyo pachayo uye kudonha kwevolti pairi.donhwe rinenge rakaenzana nechigadzirwa chekubuda ikozvino uye pa-resistance.Iyo voltage inodonha mhiri kweMOSFET yakadzikira zvakanyanya nekuda kwekudzikira kwayo-kuramba.Common linear regulators vanoshandisa PNP transistors.Mumaseketi ane PNP transistors, kudonha kwevoltage pakati pekupinza uye kubuda hakufanirwe kunge kwakadzikira kudzivirira iyo PNP transistor kuti isapinda mukuzara uye kudzikisa kugona kwekubuda.