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Pre tracking pre regulator

B

bountyhunter

Joined Sep 7, 2009
2,512
I assume you mean you will use it to feed a linear reg to reduce power dissipation. You need to make a reference that is about 3V higher than the output and reference the LM2678 to that voltage (Vout + 3V). In that way there will be a constant voltage drop of 3V across the linear regulator.
 
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