1. what is Buck converter?
A buck converter is a circuit that steps down a higher DC voltage to a lower DC voltage while increasing the curren
2. requirements
Resistor 1K , 1.2k ohm
resistor potentiometer 10k ohm
capacitor 220uf and 100uf
IC lm2596
Tblock
inductor 47uh
1N5822
LED
4. How does it work
1.First we put raw power in input (j1) if circuit have power the led will light up to show it have power we use resistor (R1) to protect the led .
2. LM2596 (U1) it turn off and on in ~150Khz, it have voltage fix 1.23v and FB pin use fraction of R2 , Rv1 to compare with 1.23V ,
if FB < 1.23 LM2596 stay on longer mean it will incread output voltage
if FB < 1.23 LM2596 stay on shorter mean it will decrease output voltage
if FB = 1.23 LM2596 stay on exactly the same example 100us on=50us , off=50us
3. inductor when U1 on it store energy in a form of magnetic energy when it off inductor can't stop instantly so it push the store energy thought diode Complete the circuit and Capacitor use for filter and stable voltage