powerful dc-dc converter

Question

Do it yourself

Recommend a dc-dc buck converter circuit with a normal output current of at least 3A. I found low-power converter circuits, but you can’t charge a modern tablet from 500mA.

Answer 1

Everything is very easy to google .
Here is an example diagram:

Answer 2

For what purposes? If you need a result, buy a ready-made module. They are available at 3-5A (although you did not voice the voltage). It is unlikely that it will be possible to assemble it yourself more efficiently.

Answer 3

Why puzzle? If there is this Chinese miracle ?

Answer 4

I threw a five -amp FDD25-05S1 under the ceiling lining , it feeds the DVR and charges the voracious Samsung Note with GPS and Bluetooth turned on. He is not afraid of heat, frost and humidity, in the radio bands of 27, 100, 433 MHz it does not emit phonitis (I have walkie-talkies in the car, so it is critical).
2A is not enough to charge the phone and simultaneously work as a navigator - slowly, but discharged.

Answer 5

There is no information at all - tension and so on.
So offhand there are pulse modules based on MP2307. For example, KIS3R33S:
we.easyelectronics.ru/part/preobrazovatel-napryazheniya-kis-3r33s-mp2307.html

Answer 6

But I want to indulge.

Well, try it. By the way, this is quite interesting.
Do you have an oscilloscope? Without it, debugging normally is almost impossible.
Further - I advise you to take typical schemes from datasheets for PWM controllers. To begin with, decide on the latter, there is a parametric search, for example, on terra .