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AN-2124 Power Optimizer design for SolarMagic SM3320

Hello all

By looking at the document SNOSB84C I can see that the string current is deemed to be I_str=P_str / Vdc_link, where P_str is the sum of the panels PV powers. My question is, how do you establish the current I_str to flow across the converters output? What is setting this current?

Thank you