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I've never seen a negative polarity applied to TL431. Is it made to sink current? Is there such a thing as a negative version of TL431? In the case of negative circuitry you must re-think and revise your approach.

The location of your 0V ground becomes important.

The direction of electron travel (or current bundle travel) must dictate your selection of devices.

Example, notice manufacturers have a series of 79xx voltage regulators because we can't use 78xx series in negative territory.