48V to 12v to 5 v buck converter

Submitted by Badstraw on Mon, 03/09/2020 - 12:53

Hey! I’m planning to design a pcb for high power Leds, I want to use 12 V fans and a 5v microcontroller (esp32). I would like to make my own buck converter.
So the question is, how do I reduce the voltage from 48 to 12 v and then 5v for the microcontroller using the same 48V 7A power supply?

I was trying to use a 12v adapter and then decrease the voltage to 5v using an LM2596S but it didn’t work (I’m getting 12v on the output). I got the values from Webench power design tool for Texas Instruments.
Here’s the schematic

 

 

I would really appreciate any help.. 

  Joined March 09, 2020      1
Monday at 12:49 PM

Check the connection of lm2596. It should work.

  Joined February 12, 2018      696
Monday at 02:11 PM

Check the connection of lm2596. It should work.

  Joined February 12, 2018      696
Monday at 02:11 PM

Check the connection of lm2596. It should work.

  Joined February 12, 2018      696
Monday at 02:11 PM