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ucc2806

ANIRUDDHA GANDHI
Prodigy 10 points
Other Parts Discussed in Thread: UCC2806

i am using ucc2806 in a push pull converter to get sine PWM output .

i am using 10% slope compensation on current sense pin

RT =15k, Ct=470 pf

Issue is i am unable to get below 10% duty cycle 

Can someone help ?

  • TI__Genius 9130 points
    Aniruddha,

    To be able to help we would need more details, schematic, component values etc.

    With the RC timing components indicated, the IC should give about 450 ns dead-time and osc freq of 70.4 kHz, i.e. 35.2 kHz at each output drive pin.

    When you say that you are suing 10% slope comp, 10% of what? How is it generated? Why do you need slope comp?

    If you cannot get below 10% duty cycle, then it means that the COMP level cannot get low enough (need to get to ~0.5 V for 0% duty), or there is a negative offset on the CS signal.


    Thanks,
    Bernard