Si88xx Automotive Digital Isolators with Integrated dc-dc Converter

Si88xx automotive products offer a complete isolation solution, combining high speed digital isolators with an isolated power supply. These products are ideal for automotive applications including battery management, PTC heaters, traction inverters, and on-board chargers.

Si88xx devices offer up to four high speed digital isolation channels integrated with a modified fly-back topology based dc-dc converter working in conjunction with an external transformer to provide up to 5 W of isolated power with a 24 V input supply. An external switch is used to supply the secondary side of the Si88xx, as well as other circuits on the isolated side with an isolated 5 V supply. The converter includes safety soft start, thermal detection, and cycle-by-cycle current limiting safety features, as well as built-in secondary sensing and feedback through the isolation barrier back to the controller, resulting in excellent line and load regulation for system stability.