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UCC21710-Q1: UCC21710-Q1 Enable pin function

Chih Kuo Hu
Prodigy 65 points
Part Number: UCC21710-Q1
Other Parts Discussed in Thread: UCC21710,

Hi, I have a question about UCC21710 enable pin(EN).

Can EN pin connected to a 500 kHz Hi/Lo signal? I want to make UCC21710 operate periodically.

Thanks!

  • 0
    TI__Mastermind 23215 points

    Hello Chih,

    Than you for the interest in the UCC21710-Q1. The expert on this part can better answer this question when they are available in the office, and will comment on the post soon.

    But I do have one question. There are two inputs IN+ and IN- for the driver inputs. Could you use the IN- for the function of changing the driver state at the frequency you mention? 500kHz seems like a high frequency for the enable and disable function.

    Regards, 

  • 0
    TI__Prodigy 150 points

    Hi Chih Kuo:

    The RST/EN pin has the same propagation delay and pulse width distortion as the IN+ and IN- pins, so 500kHz should not be a problem. What is the input PWM frequency of the IN+ and IN-? Please note the output pulse width will be distorted by the 500kHz high frequency signal of RST/EN pin.

    Thanks and Regards,

    Susan

  • 0 in reply to Richard Herring
    Prodigy 65 points

    Hi Richard,

    Thanks for your reply.

    In table 2 of datasheet shows that as long as IN- is high UCC21710-Q1 will output LOW, which also satisfy required function!

    I'll connect the 500 kHz signal to both EN & IN- for experimental usage.

    Appreciate for your suggestion! 

    Best Regards,

    Eric 

  • 0 in reply to Susan Guo
    Prodigy 65 points

    Hi Susan,

    Thanks for your suggestion, I'll connect the 500 kHz signal to both EN & IN- for experimental usage.

    For your question, IN+ is connected to PWM signal with duty cycle = 100% and IN- is connected to ground.

    Best Regards,

    Eric