Datasheet AP431, AP431A (Diodes) - 9

NOT RECOMMENDED FOR NEW DESIGN USE AS431 AP431/AP431A Application Examples
VIN V I IN RCL OUT VIN R1B R R1A R2A + R2B N OFF LED on when Low Limit < V < High Limit IN VIN Low Limit ≈ V (1 + R1B/R2B) Delay = RC x ln ( ) I = V /R REF V - V OUT REF CL IN REF High Limit V ≈ (1 + R1A/R2A) REF Fig 5. Delay Timer Fig 6. Current Limiter or Current Source Fig. 4 Voltage Monitor V V V IN IOUT IN V IN V OUT OUT PULSE R R 1 1 R R R 2 S 2 Limit ( ≈ 1 + R1/R2) x V I = V / R V = (1 + R1/R2) x V REF OUT REF S OUT REF Fig. 9 Crow Bar Fig. 7 Constant-Current Sink Fig. 8 Higher-Current Shunt Regulator VIN R1A R1B Output ON when Low Limit < V < High Limit IN + V R2A R2B BE Low Limit ≈ V (1 + R1B/R2B) + V REF BE High Limit V ≈ (1 + R1A/R2A) REF Fig. 10 Over-Voltage/ Under-Voltage Protection Circuit Note: 12. Online application note, “Design Consideration with AP431 when used as a Comparator” URL: http://www.diodes.com/_files/products_appnote_pdfs/AN78.pdf AP431/AP431A 9 of 17 September 2014 Document number: DS31002 Rev. 21 - 2
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