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LTM8025 Negative Voltages


I am using a few LTM8025 to generate both positive and negative voltage they working well,

how ever I can not find any info in the data sheet as to the Minimum negative voltage that can be generated but i can not seem to generate anything less the -12V. I have tried different values of RAdj but there does not seem to be any change in output once the resistor is has got any smaller then the 34K where is give -12V.

My input voltage is 28V

Any input would be appreciated.