This is a circuit for inductor circuit using fly back technique. This circuit is simplest form. This circuit is work with based on LT1946 as switching regulator. This is the figure of the circuit.
The transformer has been replaced with a 2-terminal inductor. The circuit is a basic inductor flyback boost regulator with a single important deviation. Q1, a high voltage device, has been interposed between the LT1946 switching regulator and the inductor. Q1, operating as a “cascode” with the LT1946’s internal switch, withstands L1’s high voltage flyback events. [Circuit’s source: Linear Technology Notes].
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