I need to supply the Vcc2 for 2 different transceivers, one for the CAN-BUS, like the ISO1042-Q1 that have a Vcc2 of 5V, and another one (not yet defined) with a Vcc2 of 3.3V.
On my PCB I have both the 5Vdc and the 3Vdc (used for supplying other ic) and I can't use other dc/dc isolated converter for the Vcc2. I must, therefore, use and isolate the two existing voltages.
For this purpose I think that I can use, for isolating both the voltages, only one power isolation transformer like this from Coilcraft:
but I'm not sure and I'm a little confused about how I can wiring the transformer for isolating both the voltages.
Referring to the schematic of the transformer, can I wire the 5V at pin 4 and the 3.3V at pin 2 of the transformer with pin 3 and pin 1 connected to their respective digital ground and connect the Vcc2 of the first transceiver at pin 8 and the Vcc2 of the second transceiver at pin 6 (with pin 7 and 5 of the transformer connected to their respective GND)?
Does everything work with the two Vcc2 correctly isolated (even among them) or am I wrong?
The transformer datasheet is here.
Best Answer
The data sheet tells you how to do it: -
It uses an SN6505 transformer driver.
No, it's a transformer and it requires an AC voltage drive and a rectifier on the output followed by a regulator to produce Vcc2.
You have to find a way that allows this to happen. You either: -