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What do the “optional” resistor and capacitor do in this circuit?

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.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty{ margin-bottom:0; } 20 1 $begingroup$ I'm designing a circuit that includes a boost converter with a few mysterious "optional" components and I'm trying to decide whether or not to include them. Does anyone know what they do? At first I thought they might be some filter but now I'm not sure. Here's the datasheet for the FitiPower FP6717 step-up converter chip. dc-dc-converter boost share | improve this question edited May 15 at 15:37 uhoh ...