Schematic diagram of an universal LED driver

[kesmez]

34063 led

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isis file **broken link removed**

This circuit is a circuit suitable for supply leds. mc34063 was done with. circuit works better with 3843. But the model file does not exist.
Output voltage can be adjusted with R3. between 0.5 volt to Vx.
pnp tranzistor important part..

 

[kesmez]

34063 led driver

**broken link removed**
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This uc3843 version..

 

[kesmez]

3843 led driver

When supply voltage is great..
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inverted buck can be use.

download isis file: https://www.2shared.com/file/6498342/932918e4/34063-2.html