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high-side current sensing chips

J

JosephKK

Jan 1, 1970
0
At 300K and Vf=.6, a change of 0.1 degree would result in delta Vf =
200 uV.
At a current decade for every 60 mV, that introduces an error (added
to existing offset) of 10^.003333 = 1.0077 or about eight tenths of
one percent.
At Vf = .7, it comes out closer to 0.9 percent.
So I get a round figure of about one percent error in the current
mirror for each tenth of a degree temp mismatch centigrade in the
transistors.

So you are paying attention after all. Good. Transistors not on the
same die are difficult to keep within a few degrees of each other. In
this case thermal design matters.
 
G

gearhead

Jan 1, 1970
0
So you are paying attention after all.  Good.  Transistors not on the
same die are difficult to keep within a few degrees of each other.  In
this case thermal design matters.- Hide quoted text -

- Show quoted text -

Pickings for current mirrors are slim. I found BCV62, but it is not
what you would call well matched at all.
 
J

JosephKK

Jan 1, 1970
0
Pickings for current mirrors are slim. I found BCV62, but it is not
what you would call well matched at all.

Just use "matched transistor pair" with any search engine.
 
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