JAJSHO6F March 2005 – July 2019 TL431-Q1 , TL432-Q1
PRODUCTION DATA.
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In this application, the TL43x-Q1 requires an input resistance in addition to the reference current (IREF) to ensure the device is in the proper operating regions while turning on. The actual voltage seen at the REF pin is
VREF = VIN – IREF × RIN. Because IREF can be as high as 4 µA, TI recommends using a resistance small enough to mitigate the error that IREF creates from VIN.