Step Down or Buck Switching Regulator

What is a Switch Mode Power Supply?

A switching regulator can be thought of as similar to linear regulator but with the series-pass transistor operating as a switch that is either OFF or switched ON (in saturated state). The output voltage from the switch is a pulse waveform which is smoothed into dc voltage by the action of LC filter

Step Down or Buck Switching Regulator

Step down converter also termed as buck converter. It produces DC output voltage lower than its input voltage. The basic circuit arrangement for step down converter is shown in figure 3. The catch diode D1, this normally reverse bias when Q1 is ON and becomes forward bias when Q1 is OFF.

            

Instructions:

1. Attempt the Pre-test
2. Read Theory
3. Simulation
4. Attempt the Post-test

                  

                   

Data Sheets:

1. MC34063A
2. TPS40222
3. LM2596