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?
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.