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According to stability boundary charts in the original datasheet, the TL431 is absolutely stable when C L is less than 1 nF or greater than 10 μF. [21] [22] Inside the 1 nF–10 μF range, the likelihood of oscillation depends on the combination of C L, I CA and V CA. [21] [22] The worst-case scenario occurs at low I CA and V CA.