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LM5045: LM5045 lost duty cycle when lighting test

yonggang zhang
Prodigy 10 points
Part Number: LM5045

Hello,

In our design, LM5045 is used as the control chip of the full-bridge topology . In the lightning test , we found that the LM5045 will lost duty cycle. If a 47pf capacitor is connected in parallel to the RT resistor, this problem will be solved. We would like to know is there any risk for this solution. Thanks in advanced.

BR//yonggang

  • 0
    TI__Mastermind 32925 points

    Adding a 47pF in parallel with RT should be no issue. I would recommend to make the capacitor smaller if possible. Observe the effect of the PWM output frequency with/without adding the parallel capacitor and then observe the effect of adding a large capacitor value. My concern is the is the RC time constant becomes too large the internal clock edges will be delayed or distorted.

    Regards,

    Steve