ESP-Wroom-32 powering

Kamool
Posts: 4
Joined: Sun May 20, 2018 10:46 am

ESP-Wroom-32 powering

Postby Kamool » Thu Dec 27, 2018 12:40 pm

Hello,

I'm building commercial project based on esp32. It uses ESP-wroom-32 module, instrumentation amplifier and one mosfet. ESP32 is in BT mode. It is used in motorcycle so I would like to power it from ignition coils 14.8V. But how?

I've tried using AMS1117-3.3, but that overheats and shuts down.

Other thing was cheap step-down converter from aliexpress. It works, but I don't think that's good idea to use that in comercial product, because it has to comply with RED/EMC.

Any other sugestions how to power up module without using several linear voltage stabilizers?

ats3788
Posts: 27
Joined: Thu Feb 01, 2018 10:12 am

Re: ESP-Wroom-32 powering

Postby ats3788 » Fri Dec 28, 2018 7:53 am

I don't have any Problems with the AMS 3.3 maybe you have a wrong resistor or broken C

Kamool
Posts: 4
Joined: Sun May 20, 2018 10:46 am

Re: ESP-Wroom-32 powering

Postby Kamool » Fri Dec 28, 2018 2:52 pm

How come You don't have any problems?

When powering from 14.8V to 3.3V at 130mA it has to dissipate almost 1,5W. Isn't that much for SOT-223 package?

I'm using 10uF at both sides.

Even 3.3V regulator in TO-220 package is not enough and overheats..

User avatar
loboris
Posts: 514
Joined: Wed Dec 21, 2016 7:40 pm

Re: ESP-Wroom-32 powering

Postby loboris » Fri Dec 28, 2018 9:23 pm

Use switching instead of linear regulator :!:

You are building a commercial project and have to ask about how to power it !? :o

Kamool
Posts: 4
Joined: Sun May 20, 2018 10:46 am

Re: ESP-Wroom-32 powering

Postby Kamool » Sun Dec 30, 2018 7:53 am

I would use switching regulator if i know how. I've never used them and I'm a little worried about noise emissions.

Are there some guide that would help me to design circuit that will comply with standards?

User avatar
loboris
Posts: 514
Joined: Wed Dec 21, 2016 7:40 pm

Re: ESP-Wroom-32 powering

Postby loboris » Sun Dec 30, 2018 10:17 am

You can start with a step-down module like this one.
I've used it and it works very good, I don't think you have to worry about noise emission.
Later, if you make your own PCB, you can integrate the circuit on it, the chip used is MP2315.

Image

Who is online

Users browsing this forum: No registered users and 10 guests