Other Parts Discussed in Thread: ISOW7821, SN6505B, , SN6505A, ISO7721
Hope someone could help with this topic and some questions below.
In our application, we have Vin = 11-16 V, a linear regulator which makes the 5V, and a ISOW7821 which makes the isolated 5V.
Since now we have to add an isolated 12V, we would like also to replace the ISOW7821 (because too expensive). I would use a SN650x because of its circuit simplicity and the small size of the package. The configuration I was thinking is the one like this, with Vin = 5V and two transformer in parallel driven together, to make a 5V with a reinforced isolation through the Transformer 750313734 and the isolated 12V (11 it’s also okay) through a 760390012 Transformer with a bridge rectifier configuration.
- Can the system work correctly with current consumption of max 20 mA @12Vout and max 75mA @5Vout ?
- If yes, how the SN650x can prevent saturation of both transformers?
- Can be used SN6501 or it’s better to use SN6505A or SN6505B?
- Are there alternative / better /cheaper transformers?
- Would you prefer 12Vout with 4 diodes voltage doubling configuration and a transformer ratio of 1.1:1 or 1.3:1 or a standard 2 diodes config and a transformer ratio of around 2.5:1 ?
- Could you suggest a different but still smart/small solution with a Vin = 11-16 V ? maybe also replacing the linear 5V regulator (5V non-isolated max current around 150mA) ?
Thank you in advance for what you can answer