Hacker News new | past | comments | ask | show | jobs | submit login

Need constant current for steady LED brightness, which the TL431 can certainly do. Maybe they just wanted to use a chip they were already sourcing in large quantities.

Constant current for a single blue LED is a little nuts to me, but you’re probably right and it made financial sense somehow.

Guidelines | FAQ | Support | API | Security | Lists | Bookmarklet | Legal | Apply to YC | Contact