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Im building a LM317 based power supply and the output range must be 0.3V-21V. I've used a 2 diodes in series and a resistor supplied by a negative voltage and take the node between resistor and diode to be a negative reference to be fed to the adjust pin of LM317 to reduce its reference voltage. Now, I found other people saying TL431 is much better reference voltage but I dont know how to reduce its reference voltage. Can someone help me?

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Now, I found other people saying TL431 is much better reference voltage but I dont know how to reduce its reference voltage

You can't reduce the reference voltage - it is fixed at 2.5 volts but you can certainly use it as a

negative voltage reference

enter image description here

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