LM1577 LM2577 dual 15V power supply

In some electronics circuits you will need a dual 15 volts dc power supply . You can design a dual 15 volts power supply circuit using a 78L15 voltage regulator ( but in this case yo will need a power supply that will provide more than 15 volts ) or you can use this Flyback Regulator circuit designed using LM1577or LM2577 ( difference between them is the working temperature ) .

This power supply dc circuit will provide an dual 15 volts output ( plus and minus ) from an 5 volts input voltage . The circuit require few external components an can be very easy to design . This circuit will provide a maximum output current of 225 mA for each output .

The LM1577 LM2577 is available in different packages: 5-Lead TO-220 (T), 16-Lead DIP (N), 24-Lead Surface Mount (M), TO-263 (S) 5-Lead Surface-Mount and 4-Lead TO-3.
Pin numbers shown in the schematic are for the TO-220 package (LM2577T-15).

The 12V fixed voltage version and the ADJ version of the IC can be used too, for different output voltages. In case of the ADJ version if you must disconnect pin 2 from +Vout and connect it to the middle of a divisor made with 2 resistors in series. Calculate the resistors with the formula:
VOUT = 1.23V (1 + R1/R2)
T1 can be : PE-65300 (Pulse), 326-0637 (AIE), RL-2580 (Renco) or equivalents and D1, D2 are 1N5821 (Schottky Barrier Rectifier diodes) .