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UCC28063: After trial production of UCC28063, abnormal sounds and anomalies were found to be solved.

ken chen
Intellectual 390 points
Part Number: UCC28063

HI TI TEAM,

The customer now uses the following interlaced PFC IC of UCC28063. In actual use, it is found that the C220 needs to be changed from 101 to 33P to solve the abnormal sound of the 90V switch (the voltage is 90-305, the standard is 108-277).

However, if the C215 and C214 of ZCD are changed too small, the PF value and THD will become worse.

If not changed, 90V switching machine abnormal sound, heavy and heavy load switching PF will be abnormal explosion. 245V will have a different sound.

 

  • 0
    TI__Guru* 85616 points

    Hello,

    I am reviewing your inquiry and will get back to you shortly.

    Regards,

  • 0 in reply to Mike O'
    TI__Guru* 85616 points

    Hello,

    You had mentioned that you needed to reduce capacitor C220 from 100 pF to 33 pF to remove a noise issue.  The schematic shows  this capacitor as starting out to be 1 nF.  Are the values your are reporting correct?

    Why was the ZCD capacitance changed?  Was this pin noisy?

    Increasing the capacitor will decrease the noise, decreasing it will reduce it.

    Did you use the excel design tool to calculate your boost inductance, boost inductance turns ratio, output capacitance and compensation components?

    If not this may be what is causing your design to be audible.  I would start by using the excel tool to check your customers design.

    If there are a major differences between what the tool calculates and the customer design this may be the cause.  The following link will bring you to the excel tool that can be used to check the customers design.

    https://dr-download.ti.com/design-tools-simulation/calculation-tool/MD-0ashiqdgby/01.00.00.00/sluc292.zip

    Regards,