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LM3880-Q1: min pulse of EN

Part Number: LM3880-Q1


Is there any limitation of EN pulse width?

The FLAG does not response if the small pulse of EN signal(High or Low) which is smaller than delay time is input.


Koji Hamamoto

  • Hi Koji
    EN pin has a glitch free operation. The first timer will start counting at a rising threshold of EN, but will always reset if th EN pin is deaseerted before the first output flag is relased. Please refer section 7.3.1 of

    If the EN pulse width is less than the delay time, the FLAG does not response.

    The EN pulse should stay active during whole power-up sequence.
    if the EN is de-aserted before the power-up sequence is completed, the device enter a controlled shutdown. Please refer 7.3.2 of Data sheet.