Epson L-1000 Technical Manual page 180

APPENDIX
REV.-A
A.l.7 TL431 CLPB (58)
The TL431 is a high-accuracy, temperature-compensated shunt regulator. The output voltage can be set anywhere
between 2.5 V and 36 V by adding two external resistors. The TL431 is very stable and outputs a large current
so that it can replace various Zener diodes. It is especially suitable for driving the photodiode in the photocoupler
section of the feedback circuit, employed in the RCC system switching regulator.
Figure A-15. TL431CLPB Pin Diagram
Figure A-16. TL431CLPB Internal Circuit
LQ-500/L-1000
A-15