TL494 - which comonent works with lower frequencies?

Discussion in 'The Projects Forum' started by Vooortex, May 20, 2012.

  1. Vooortex

    Thread Starter New Member

    May 20, 2012
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    Hello All,

    I have been asked by a friend to find for him (he´s very busy in the moment) a component, that
    - works (other than TL494) also with very low frequencies (till 1 to 10 Hertz range) and
    - can create 2 phase-shifted square-wave-signals with time delay. (See attachment - >Totzeiten< means time delay).

    Hope, you can help. Thanks
     
  2. wayneh

    Expert

    Sep 9, 2010
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    The drawing shows two square waves, same frequency and center synchronized, but with a slightly different duty cycle. Is that really what you need?
     
  3. Vooortex

    Thread Starter New Member

    May 20, 2012
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    Hello wayneh,

    yes, slightly different duty cycle is correct.
     
  4. wayneh

    Expert

    Sep 9, 2010
    12,093
    3,030
    Could they synch together at the leading or trailing edge of the pulses instead of in the middle? I'm no expert, but synching on an edge sounds an awful lot easier.
     
  5. crutschow

    Expert

    Mar 14, 2008
    12,990
    3,226
    What do you want to happen when the frequency changes? Duty-cycle stays constant, or the pulse-width stays the same and the duty cycle varies?
     
  6. Vooortex

    Thread Starter New Member

    May 20, 2012
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    @ wayneh: there must be at least 100ns time delay.

    @ crutschow: duty cycle stays constant
     
  7. kubeek

    AAC Fanatic!

    Sep 20, 2005
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    Do you realize that on both the paper and the screenshot the duty cycle is NOT constant?
     
  8. Vooortex

    Thread Starter New Member

    May 20, 2012
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    @ kubeek: yes that´s true, but in my case it´s not that important (it would be nice to have it more constant though:)
    What I am looking for is an adjustable dead time.
     
  9. kubeek

    AAC Fanatic!

    Sep 20, 2005
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    You see, things are much easier when people ask for what they actually need and not how to bend their solution to work ;)

    What about sg3525?
     
  10. Vooortex

    Thread Starter New Member

    May 20, 2012
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    Dear kubeek, you are absolutely right :)
    The sg3525 starts at 100Hz. Any idea for lower frequencies (1 to 10 Hertz)?
     
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