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UCC256404: Frequency Range for the AC input for HV pin

Vineet Anurag
Prodigy 200 points
Part Number: UCC256404
Other Parts Discussed in Thread: UCC256402

Hi,

I wanted to know whether UCC256404 can support the AC input for it's HV pin with a frequency range of 380 to 800 Hz or not ?

Regards,

Vineet

  • 0
    TI__Mastermind 27095 points

    Hi Vineet,

    The HV startup function will work just fine at higher AC frequency. The X cap discharge function will work as well but I would be curious what X cap discharge standard do you need to meet. Is this for an avionics application? We currently have CB certificates for IEC60065, IEC60950 and IEC62368. Do you know which X cap discharge standard you need to satisfy for your design?

    If X cap discharge is not needed, you could use UCC256402 which has high voltage startup with no X cap discharge function. With UCC256402, you can connect the HV pin to either AC or DC input.

    Best Regards,

    Ben Lough