Here I want to share about power supply used by legrand which is UK based company specialized in switching and home automation. When I studied 555, 741, 78xx, 79xx, 317 I always wandered that is this products are still used in commercial application or not. No doubt these ICs are very popular among students and hobbyist but companies may have some different requirement .So it is very interesting to get introduce your self with commercial products.
The power supply have input 230V ac and output 27V dc and current from 1 to 2A.Basic component is same that we studied in our books like input 230V is applied to a step down transformer through a fuse then bridge rectifier, capacitors. But the difference is that instead of using any linear regulator, switching regulator LM2576HVT is used here.
The LM2576 series offers a high-efficiency replacement for popular three-terminal linear regulators. It substantially reduces the size of the heat sink, and in some cases no heat
Sink is required.
They are available in fixed output voltage 3.3, 5, 12, and 15V.And also available in variable version. There is not different names for different version like 7805, 7815, 7812 but the output voltage is always printed on the package it self. Legrand uses adjustable version.
But compared to three terminal liner regulators LM2576 cost more price is around 100 INR. Except this all the other things are same. This power supply is used to provide power to the home automation products produced by legrand.
