dc-dc converter - high efficiency, low noise and ripple

[ksyfer]

Hi,

I need to design a 24V dc (input supply tolerance 19.2V to 32V dc) to 5V, 3A dc converter with 1.5KV isolation between the input and the output.

I want the dc-dc converter to have a high efficiency (90+ if possible) and low ripple (<200mVp-p) at the output

I don't want any software control over the converter i.e., I dont want the PWM switching to be controlled by a micro controller or a DSP.
I also want the converter to be closed loop i.e., control using feedback

Currently, I am using flyback configuration for this design.

Please suggest a better configuration for the design.

Any help is appreciated

Thanks in advance

 

[mtwieg]

A forward or push-pull converter would likely suit your needs. The ripple spec shouldn't be a problem, but the efficiency spec will require careful selection of the components, especially the transformer.

 

[ksyfer]

A forward or push-pull converter would likely suit your needs. The ripple spec shouldn't be a problem, but the efficiency spec will require careful selection of the components, especially the transformer.

Thank you mtwieg

Any document / website with guidelines/rules of thumb for transformer selection?

I will try too, but advice of an experienced person will save my time...

 

[BradtheRad]

Wikipedia has a helpful article.
It has tables comparing features of the various topologies:

https://en.wikipedia.org/wiki/Switched-mode_power_supply