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UCC3813 family has two diferent current-sense comparators

NY
Expert 3040 points
Other Parts Discussed in Thread: UCC3813-3

To whom it may concern,

I am FAE, one of the customer in central Japan is trying to use UCC3813-3.

According to dataseet, UCC3813 has 2 different current sense comparators (PWM comparator and overcurrent comp) , so the question is;

I am assuming that one signal is compared with output voltage of error amp and the other signal is to be compared with 1.5V which is overcurrent Vth. Since oen signal goes to PWM comparator, it would be compared by every cycle (typically 30kHz). However, how about overcurent comparator? Is this compared with 1.5V every cycle? if not, when the overcurrent comp will govern rather than PWM comprator?

Best Regards,

Naoki Yada

  • 0
    TI__Expert 7395 points
    Yada-san,
    the overcurrent comparator is compared to its reference 1.5V limit every switching cycle as well. the overcurrent comparator only governs when the 1.5V overcurrent limit is reached, at which point it initiates a softstart. if the 1.5V current limit is not reached on the overcurrent comp, it does nothing
    Regards,
    John