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The open loop buck converter designed in the previous tutorial did not had a regulated output. The output voltage was varying with the resistance of the load. The output of the circuit designed in the previous tutorial could be regulated by adding a feedback circuit in it. The feedback circuit could help in error detection of the output voltage and change duty cycle of the frequency on which circuit operates to provide a constant output voltage irrespective of the load resistance. 
 
Contrary to Linear Regulators which step down the DC voltage by dissipating the heat, Buck Converters step down the DC voltage through switching regulators and also step up the output current. According to the law of power conservation, input power must be equal to output power. 
Designing Open Loop Non – Isolated Buck ConverterThe designing of Boost Converter SMPS has been already discussed in the previous tutorials. In this tutorial, an open loop buck converter SMPS will be designed. The Buck Converter is also one of the topologies of the SMPS (Switched Mode Power Supply). These type of SMPS steps down the DC voltage unlike the Boost converters step up the DC voltage.
 
So the buck Converter is also a DC to DC step down converter in which the output voltage is always less than the input voltage. Contrary to Linear Regulators which step down the DC voltage by dissipating the heat, Buck Converters step down the DC voltage through switching regulators and also step up the output current.
Testing Closed Loop Boost Converter Circuit The closed loop boost converter designed in the previous tutorial though had a constant and regulated voltage at the output but it could not be varied. For a stable output that Boost converter had an error detection circuit. The error detection was done by adding a feedback circuit which continuously checks the error in the output voltage and provided a regulated voltage at the output.
 
For making the output of the circuit adjustable, it must be drawn through a variable resistor. This closed loop boost converter not only had a feedback circuit, its output is also adjustable. Therefore in this tutorial, a closed loop non–isolated boost converter is designed.

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