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with a soft start circuit, the first PWM pulse is initialed when comp pin is up to 1.5V(around), so the first Ton is higher than expectation and the initial current is higher.
The startup current is drawn by UC2843 during the Vdd voltage is ramping towards the UVLO threshold.
When VDD reaches the UVLO turnON threshold there is a transition when the controller requires more current to charge the internal bias for Vref(to provide power for the internal circuit), drive the oscillator for OUTPUT, charge the SS caps, etc.
