Step-down Vary Power Circuit Composed of MC34063 is shown in the diagram. MC34063 is a type of switching modehighly active DC/DC Changed circuits.
Its internalincludes reference voltage source withthe function of temperature compensation, comparator, duty ration controllable oscillator with limited current circuit, driver and heavy current output switch tube.
The +12V/+5V step-down vary power composed of it is shown in the picture,
The features are: (VIN=25V when IO=500mA) line regulation is 12mV±0.12%; load regulation is 3mV±0.03%; ripple voltage is 120mV. If one-level filter (shown in figure) output ripple reduced to 40mV; conversion efficiency is 82%; short-circuit limiting current is 1.1A.
Input : 9 – 15 volt
Output 5 volt regulated, 500ma
Application : DC Charger from 12 v dc battery or solar panel from 9-15 volt.
Package contain : 3 pcs
5 volt regulated power supply board.