[sdiy] 2164 Expo correction

[ASSI]

On Saturday 26 March 2011, David G. Dixon wrote:
> Does that mean that the relative error might be decreased by increasing
> the quiescent current through the transistors (i.e., by feeding a
> significant current into the MODE pin)?  I'm going to try that.  It's a
> long shot, but what the hell...

No.  More quiescent current also means more base current.  For an expo 
converter you would want a very low Rbe, but the effective Rbe in the 
SSM2164 is whatever the transistor delivers plus 450 Ohms.  You can't work 
around that since you can't get at the bases directly.


Achim.
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