BOOST and BUCK IC
We generally adopted led constant current ic to drive LED. the constant current ic is divided into three kind: BOOST , BUCK and BOOST & buck.

the engineer rarely use the BOOST & buck IC , because it’s much more expensive than others. now we are get a question that how to choose BUCK and BOOST for our project. base on the follow way to chose the appropriate DC-DC for your project.

Input voltage is big than load voltage, please chose the BUCK IC

contrary, the load voltage is big input voltage, please chose the BOOST IC.