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Vout calculation when Lt8390 parallel


    We are using parallel Lt8390 to output 24V,40A.  According to the reference arcticle 60V Synchronous, Low EMI Buck-Boost for High Power and High Efficiency | Analog Devices. The Vout of the slave is set 13.1 while the output is 12V. So I am confused what the Vout should be set to output 24V. Should it be a little greater than 24, such as 25? Are there any rules to set the vout of the slave Lt8390. 

     Thanks for your help.