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Elaboration regarding the ADP1613's capacitor equations

Question asked by cantthinkofaname1029 on Jun 13, 2015
Latest reply on Jun 15, 2015 by hyao

Hello folks,

 

So I'm attempting to use the ADP1613 dc/dc converter to take an input of approximately 5.4V and output 18V. Some of the equations involved have wound up confusing me; the ones that have me mainly hung up are the calculations for the Rcomp and the Ccomp.

 

According to the datasheet, for the Rcomp you calculate: Rcomp =  (4746 * Fc * Cout * Vout * Vout)/Vin

 

However, this doesn't appear to match up with the example list provided further in the datasheet -- I've tried doing this calculation using the numbers provided in the examples for the 12, 15, and 20V outputs and yet none of these calculations give out the numbers that said examples are using for their Rcomp's. Am I missing something vital?Power By Linear

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