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UC3902 load share controller

Hi! We are using several power supply modules sharing a common 60V output. The modules share current well. However, if we connect more than two modules in the current sharing scheme, all COMP outputs take off and rail at 2.3V. Correspondingly, the output voltage increases by the value of the capture range. We tend to blame insufficient internal offset at the input of the error amp. But how can we fix the problem? Thanks!

Alex