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SEPIC DC DC Converter

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Troin

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Dear Members,
I am trying to develop a battery operated device which works on Automobile battery (12V/24VDC) , so the input range is around 9-36VAC.

I need to derive two isolated supplies 5VDC@500mA and 12VDC@1A.I have seen circuits using UC3483 for such circuits.


I need help in deciding the transformer for the same , can anyone help.

https://dren.dk/carpower.html Reference circuit

With regards
 

Troin said:
Dear Members,
I am trying to develop a battery operated device which works on Automobile battery (12V/24VDC) , so the input range is around 9-36VAC.

I need to derive two isolated supplies 5VDC(at)500mA and 12VDC(at)1A.I have seen circuits using UC3483 for such circuits.


I need help in deciding the transformer for the same , can anyone help.

https://dren.dk/carpower.html Reference circuit

With regards
Click to expand...
The reference circuit you provide does not have isolation. Is isolation a requirement?

I have never seen an isolated SEPIC topology.
 

Isolation seems to be a must but I a puzzled how to get it.

There is one +12/24VDC supply

12VDC
->>> Relay (interfaced to outside world)
->>>Opto LED side ( Inputs from external sources)

5VDC
->>> Microcontroller (here is the complication)
->>> Opto LED Transistor side

The micro is supposed to measure AC line input and the neutral from the AC line is coupled to the digital ground.
If I don't isolate the neutral will be connected to ground / -ve terminal of the supply battery.
Any suggestions ?
 

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