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UCC3895: Concern on 6.8nF CT for low Fsw

Part Number: UCC3895

Hi expert,

Customer designed with UCC3895 in ~14kHz Fsw. With RT=100kohm and CT=6.8nF which is far more than CT recommended max value 880pF.

What's the risk for doing this with high CT? The discharging current may be high and do harm to internal FET, right? What else?



  • Hi Joyce,

    The datasheet has this warning about using a large Ct capacitor:

    Figure 11 is shown below

    The large capacitor will effectively limit the supportable power range. 

    I hope this answers your question.