ISODriver or a Digital Isolator that supplies auxiliary/secondary side supply

by <a href="http://community.silabs.com/t5/Welcome-and-Announcements/Community-Ranking-System-and-Recognition-Program/m-p/140490#U140490"><font color="#000000"><font size="2">Hero Employee</font></font> </a> Silicon_Labs on ‎05-02-2017 08:09 AM

Question

Does Silicon Labs have an ISODriver or a Digital Isolator that supplies auxiliary/secondary side supply for itself and other circuits on the secondary side?

Answer

Yes, Silicon Labs’ has a couple option when it comes to ISODrivers. For low frequency applications, you can consider the Si875x. This device transmits enough power across the isolation barrier to power itself and drive a power FET.  It can typically switch the FET up to 1 kHz and is an excellent choice when replacing a solid-state relay (SSR).   A second option is the Si828x family that uses an external transformer to provide up to 2 Watts of energy to the secondary side at 75% efficiency.  The 2 watts is more than the device uses and the excess can be used to power other secondary side circuits.  As for self-secondary powered Digital Isolators, the Si88xx family provides 2 watts to secondary side for those engineers that needs our standard digital isolation channels.

 

Learn more about our isolation solutions: 

http://www.silabs.com/products/isolation