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RE: Resistor dissipation Question

An important fact that nobody has mentioned... the RMS current through this resistor is considerably higher than the total DC current! The current waveform here is not a sine wave - it has a higher peak value due to the charging current for C1. Another to way to look at it - the resistor carries the DC output current PLUS the ripple current in the capacitor.

PSUD will have an RMS value for the resistor in the table - THIS is the figure you must use to calculate dissipation. It's higher than you think...


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