TL431 Voltage-regulator

Raws li tau hais ua ntej, TL431 muaj 2.5V siv hluav taws xob sab hauv, yog li thaum cov lus tawm tswv yim tawm tswv yim ntawm REF kawg, lub cuab yeej tuaj yeem tswj cov zis hluav taws xob los ntawm ntau yam shunt los ntawm cathode mus rau anode. Raws li pom nyob rau hauv daim duab saum toj no, thaum qhov kev tiv thaiv qhov tseem ceeb ntawm R1 thiab R2 raug txiav txim, lawv qhia tawm tswv yim ntawm ib nrab voltage ntawm Vo. Yog tias Vo nce, cov lus tawm tswv yim nce ntxiv, thiab qhov shunt ntawm TL431 kuj nce, ua rau txo qis hauv Vo. Nws pom tseeb tias qhov kev tawm tswv yim tsis zoo no yuav tsum nyob ruaj khov ntawm VI sib npaug rau qhov siv hluav taws xob, qhov twg Vo=(1 ntxiv rau R1/R2) Vref. Xaiv qhov sib txawv ntawm R1 thiab R2 tuaj yeem ua rau muaj ntau qhov hluav taws xob tawm ntawm 2.5V txog 36V, tshwj xeeb tshaj yog thaum R1=R2, Vo=5V. Nws yuav tsum tau muab sau tseg tias thaum xaiv ib tug resistor, nws yog tsim nyog los xyuas kom meej tias qhov tsim nyog tej yam kev mob rau TL431 ua hauj lwm yog hais tias tam sim no dhau los ntawm lub cathode yuav tsum ntau tshaj 1mA.