A buck converter is an electronic circuit that steps down from high voltage to low voltage. A DC-to-DC buck converter is essential in different applications, such as Audio amplifiers, LED circuits, and other power supply circuits. Those Buck converters efficiently convert high-voltage DC to low-voltage DC.
Introduction to the Buck Converter
A Buck converter is a very simple circuit. Figure 1 is a model circuit of a buck converter. The circuit contains a Mosfet, PWM controlling IC, Schottky Diode, and a toroid core with copper winding coil.
The DC transferring function is an equation that relates to the input voltage, output voltage, and also the duty cycle. V out = Vin *D where the V out is the voltage in the output section, Vin is the voltage input, and D is the duty cycle. ( or the percentage of the time that the Mosfet turns on in the circuit ).
The low pass filter ( the toroidal winding coil ) smoothes the MOSFET switching action and produces a nice and smooth DC voltage in the output.
Basic Buck Converter Diagram
Buck Converter Module in the Market
LM2596 Buck Converter Circuit
Components Required
| Part Number | quantity |
| LM2596 | 1 |
| 100uf capacitor | 1 |
| 1N5822 diode | 1 |
| 33uH coil | 1 |
| 220uf/63v capacitor | 1 |
| 50K preset pot | 1 |
| 1.21k ( 1.2k) resistor | 1 |
| power supply | 1 |
| wires | – |
| connectors | – |
i,m new in electronic, but i want to learn to read schematic, base on schematic above 2 pin potensiometer pin 1 an 2 conected to resistor 1.2k, am i coorect?thanks
Yes