BCR400W Datasheet, PDF (7/7 Pages) Siemens Semiconductor Group – Active Bias Controller (Supplies stable bias current even at low battery voltage and extreme ambient temperature variation)

Low voltage reference
BCR 400
14
BCR400W
2
Red
LED
V _REF
3
+V_S
EHA07219
Precision timer with BCR400
providing constant charge current
+V_S
BCR 400
3
2
R _ext
4
1
78 ⁴
Timer IC
(555)
3
6
21 ₅
EHA07191
7
Aug-07-2001