| ??? 12/03/08 18:23 Modified: 12/03/08 19:28 Read: times |
#160559 - Links and hints... Responding to: ???'s previous message |
http://www.datasheetcatalog.com/datasheet...S740.shtml
http://datasheets.maxim-ic.com/en/ds/MAX253.pdf In your current range choose arround 50...100 turns per winding. Winding ratio >1 recommended to compensate for rectifier voltage drop: 1CT:1.3CT, e.g., or even 1CT:2CT. Copper resistance per winding about 100...200Ohm, depends on load regulation you can allow. Rectifying diodes will show about 1...10Ohm. Inductivity per winding in the 200...800µH range. Choose sufficiently high chopping frequency: 200...400kHz can easily be achieved with proper ferrite core. Schottky diodes like 1N5817 and toroidal shaped ferrite core preferred then. Regulator at output optionally for enhanced load and line regulation... Kai |
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