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Cheap Switch-Mode DC-DC Converter(MC34063)

2015-09-16 10:34  
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This article describes the Cheap Switch-Mode DC-DC Converter (MC34063). The principle is very simple, very practical. The circuit components can help you understand better grasp this principle. For example, in this circuit, you can go to find and buy these components: MC34063.

This circuit is based on mobile phone chargers. These chargers are based on the Motorola MC34063 switchmode IC. By changing the values of the feedback resistors (R1 & R2), the output voltage can be varied over a wide range. Just modify R1 and R2 according to the formula: Vout = 1.25 (1 R2/R1). The values shown give an output of 3V.

Figure:1 Cheap Switch-mode DC-DC Converter Circuit Diagram

Figure 1 Cheap Switch-mode DC-DC Converter Circuit Diagram

 

 


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