Datasheet

DocID2143 Rev 31 35/57
L78xx, L78xxC, L78xxAB, L78xxAC Application information
Note: Q
2
is connected as a diode in order to compensate the variation of the Q
1
V
BE
with the
temperature. C allows a slow rise time of the V
O
.
Figure 26. Adjustable output voltage with temperature compensation
V
O
= V
XX
(1+R
2
/R
1
) + V
BE
Figure 27. Light controllers (V
O(min)
= V
XX
+ V
BE
)
V
O
rises when the light goes up
V
O
falls when the light goes up