I'm a beginner and I'm designing a PCB where I want to power my PCB from a 12-24 V DC car charger. On PCB itself, I want to use 5 V and 3.3 V for different components, so for this purpose I'm trying to find some ways to step down dc voltage from 12-24 V to 5 V.
I searched and found that buck converter, LDO and linear voltage regulators are usually used to step down DC voltages but I have few requirements.
- I have an active antenna on my PCB so I want to avoid the use of buck converter because they use inductors and produce magnetic field which can interfere with antenna signals which are usually weak.
- I don't want to use linear voltage regulators because they produce a lot of heat.
- I couldn't find suitable LDOs in market who can step down 24 V to 5 V without producing much heat. (If someone know any specific LDO which can perform my task, please let me know.)
Personally I want to use buck converter because of their efficiency and low heat dissipation but can someone help me how can I check if magnetic field produced by buck converter will interfere with antenna signals or not? Is there any calculator or formula which I can use to determine the effect? Can I place both of them far (then how far?) to avoid interference.
If you have any other solutions for this problem, please reply.
Thanks a lot!