Design and Simulation
The solution to creating the DC cell phone charger is to design an isolated converter.
Although there are various topologies of isolated converters, we immediately decided upon the
flyback topology. We chose the flyback topology because it is small in terms of the numbers of
components used, as well as the cost [9]. The size and cost of production was very important in
determining the converter topology because of our target consumers. A small and inexpensive
charger was necessary for the DC House project.
With the converter topology chosen, we can begin to look at the system diagram shown
below in Figure 4.1. The converter should take an input of 48 volts and reduce the voltage to
two, 5 volt outputs. To help with design process of the charger, we determined to use the LT3748
Switching Regulator Controller designed and manufactured by Linear Technology due to its
intended use for isolated flyback converters.