TL431/TL431ATypical Application R ⎛ ⎞ R ⎛ 1⎞ R ⎛ ⎞ V 1 = 1 1 + ---- V V = V 1 + ---- V = 1 + ---- V O ⎝ R ⎠ ref O ref⎝ R ⎠ O ⎝ R ⎠ ref 2 2 2 MC7805/LM7805TL431/ATL431/ATL431/AFigure 10. Shunt RegulatorFigure 11. Output Control for Three-Figure 12. High Current Shunt Regula-Termianl Fixed RegulatortorTL431/ATL431/AFigure 13. Current Limit or Current SourceFigure 14. Constant-Current Sink6