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UCC28063 VINAC

Hi,

1.      The capacitor is connected to VINAC pin on myy customer's circuit for the noise filter.

When the capacitance is little, the input current wave form is distorted(Please refer the sheet "Q1" of attached file).

A) Why is the waveform distorted when When the capacitance is little?

B) How much is this capacitance recommended max value?

When the capacitor is 100pF, there is large input current surge.

C) How should we solve this surge current(Please refer the sheet "Q3" of attached file)?

2)  When light load mode, there is the surge current by peak (please refer the sheet "Q2" of attached file).

D) How should we solve this surge current?

UCC28063 Input current.xlsx

If the circuit is needed, please send e-mail to me(following address).

kuramochi@fujiele.co.jp

If there is lack of information please let me know.

Thanks and Regards,

Kuramochi