I'm designing a product that has a 24V input, but the voltage rails on the product are 15V, 12V, 5V and 3.3V. The 24V is from this supply. To get the lower voltage I've been cascading cheap modules from amazon based on the MP1584. One steps down the voltage from 24V to 15V and another feeds off the 15V to reduce to 5V. I use a linear regulator for the 12V and 3V3 rail.
Now my question: I need to come up with a power supply solution for this product and remove the cheap modules from Amazon. For the fairly high output power (45W and 10-15W) I require is it better to design the circuit myself or to purchase a pre-made DC-DC solution? It is important to note that I have no power supply design experience and my time on this project is limited. I see that I have two options:
- Design bespoke DC-DC converter circuit using an off the shelf chip for a 15V 45W output and again for a 5V 10W output.
- Buy a complete off the shelf module; one for 15V and one for 5V
This product isn't too cost sensitive so could spend approx. £10-15 - $20-ish on this solution.
Any suggestions are welcome.