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见datasheet第12页描述： UCC28180 employs two control loops. An internal error amplifier and 5-V reference provide a slow outer loop to control output voltage. External compensation of this outer loop is applied by means of the VCOMP pin. The inner current loop shapes the average input current to match the sinusoidal input voltage. The inner current loop avoids the need to sense input voltage by exploiting the relationship between input voltage and boost duty-cycle. External compensation of the inner current loop is applied by means of the ICOMP pin.
