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Original question:

UCC256303: Burst mode disable/ seting minimum switching frequency

UCC256303: Switching Frequency

parisaSA
Prodigy 130 points
Part Number: UCC256303

Hi 

I am using UCC256303 for an LLC circuit. 

the Lo pulses are like: 

the frequency is 6.49 Khz, that is much lower than min switching frequeny (35 KHz). 

how can I fix it? 

Best Regards,

Parisa

  • 0
    TI__Mastermind 27105 points
    Hi Parisa,

    Check your VCR voltage and make sure the VCR waveform is between 0V to 6V. If it is not, then look at your resonant capacitor voltage and check if the resonant capacitor voltage is sinusoidal. If it is not, then check if both gate drives are successfully turning on their respective MOSFETs.

    Best Regards,
    Ben Lough