TOP204 15V switching power supply circuit

A 15V switching power supply circuit project can be constructed using the TOP204 switching controller integrated circuit manufactured by Power Integrations INC .
TOP204 switching power supply circuit diagram can be very useful for applications that don’t need a huge power .
The design of the switching power supply using the TOP204 IC is not so complicate , an require few external components , making it ideally for compact power sources .

The switching power supply circuit shown in this schematic is a highly accurate 15 V, 30 W secondary regulated flyback power supply that will operate from a wide range of input voltage between 85 to 265 VAC . A TL431 shunt regulator directly senses and accurately regulates the output voltage. The output voltage of the circuit can be fine tuned by adjusting the resistor divider formed by R4 and R5. Also other output voltages are possible by adjusting the transformer turns ratios as well as the divider ratio.
More details about the T1 transformer construction can be found in TOPSwitch® Flyback Transformer Construction Guide from the Power Integrations .