simple switcher constant current supply with high side sense resistor

From: Tim Mitchell (timng_at_sabretechnology.co.uk)
Date: 02/03/05 

Date: Thu, 3 Feb 2005 09:07:02 +0000

I'm trying to design a simple switcher constant current circuit (using
the LM2574-ADJ). It's easy enough if you put the sense resistor between
the load and ground. However the snag is that the current sense resistor
has to be on the high side of the load (there are 3 current supplies
driving 3 devices with a commoned ground).

Does anyone know of a clever way of doing this without getting into
differential amplifiers? 

-- 
Tim Mitchell

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