TIDUET3 Design guide

TIDUET3 February 2021

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2.4.1.2 Current Calculation

The input fuse, bridge rectifier, and input capacitor are selected based on the input current calculations. First, determine the maximum average output current, Iout(max), allowing for an overload to 110% of maximum load power.

Equation 1.

The PFC stage is 500 W at high-line input at 180 V to 265 V and is derating to 300 W at low-line input at 90 V to 127 V. The maximum input RMS line current, Iin_rms(max), is calculated with minimum input voltage, the efficiency and power factor initial assumptions, allowing for an overload to 110% of maximum load power.

Equation 2.

The maximum input peak current is:

Equation 3.

The maximum input average current is:

Equation 4.