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3.7.2 External VCC Supply
External VCC supply helps to reduce the temperature and the power loss of the LM5117 at high input
voltage. By populating D1 and R7, VCC can be supplied from the output. In this evaluation board, VCC is
supplied from 12V output to achieve high efficiency.
Figure 9. Loss Comparison at 48V; With External VCC vs Without External VCC
9
SNVA466B–May 2011–Revised April 2013 AN-2103 LM25117 Evaluation Board
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