Voltage controlled 10V->100V DC-DC converter

Is there an easy way to make a voltage controlled DC-DC converter with
say a 0-10V input and a 0-100V output? MAXIM has an app note for
something like this, though it's controlled by resistors as far as I
can tell.

http://www.maxim-ic.com/appnotes.cfm/appnote_number/1751

I might be able to use a FET as a voltage controlled resistor (this may
show my complete lack of knowledge about circuits...) and therefor
control the output voltage though. I need to make ~100 of these, so I
need it to be kinda small -- a chip with some R/C/L/diodes would be
preferable.


Jesse

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