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Suggest me a cheap solution for isolating DC/DC converter voltage source

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andy63

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Hi everybody, I'm not familiar with DC/DC converter design, so I ask you for suggestions.
I have a voltage source of 24V DC and need 2 outputs:
V1 = 5V /0.5A for TTL logic
V2 = 16 to 35 V / 0.5A
Both V1 and V2 must be isolated from source.
V2 is to be controlled by a microcontroller according to a thermistor.
I've been searching on web for suitable commercial devices for V2 but nothing.
Please, what configuration is better for a simple /low cost solution?
Where can I find some details for this implementation?
Many thanks in advance.
 

Re: Isolated DC/DC help

For V1 you need to use a buck circuit and for V2 you will need a buck-boost circuit.

For you isolation needs you can use a transformer to electrically isolate V1 and V2 from the primary source.

Look at www.ti.com for suggestions. Specifically search for Unitrode.

E
 

Isolated DC/DC help

You could use a flyback. Take feedback off the 5V,and use a secondary winding to provide Vin for a programmable regulator.

I'm Not sure this is what your trying to do but Here is an example of a current to voltage converter. fig 5

Code: 
http://atmel.com/dyn/resources/prod_documents/DOC0524.PDF

You will probably have to use an additional winding to generate Vcc for your IC's.
 

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