Today, they are ubiquitous in switching-mode power supplies. The TL431 exhibits an interesting instability under ... The dynamic resistance can be shown to be A linear fit of the datasheet ...

This power tip will focus on closing the feedback loop in an isolated power supply with a TL431 shunt regulator ... loop is accomplished by connecting the top side of R8 to a linear regulator. This ...

To see the TL431 in action here, first imagine that it’s not conducting (off). Current flows from the power supply through RB1 and into the transistor, turning it on. The voltage at Vout ...

TL431’s can most often be found hiding in switching power supplies. The Apple II switcher had one, and many current ATX supplies have 3. Uninformed parts scroungers may miss them, as they often ...