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Using different dc-dc converters together

Hi,

We are designing a device which has a mainboard and some external cardridges. There is one 24 Vdc input on mainboard.

The mainboard and the cartridges requires three different supply voltages; 24Vdc, 5Vdc and 3.3Vdc. But the mainboard and all the cartridges should have their own isolated voltages. There will be max 1.5 A current load on 24 volt, 1.5A load on 5 volt and less then 0.5 amper load on 3.3 volt (these values are for each supply.)

I need some advices for this design requirements. Which isolated dc-dc converters I should use?

And I have worries about using some isolated dc-dc converters on different cartridges which will connect to the same 24 V input. Because when I connect cartridges together this converters will be in parallel. Does this situation cause a problem?