TC4427 Issue

Discussion in 'General Electronics Chat' started by bobbie, Aug 14, 2013.

  1. bobbie

    Thread Starter New Member

    Jan 26, 2010
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    0
    Hi there.
    I have a PWM circuit that drives a TC4427. The input is 4.7volts, the output from the SG3524 I have used. There is nothing complicated about this circuit. It works.

    However, that said, I cannot get anymore out of the 4427 than a 5 volt pulse. I am driving the 4427 from a fully charged 12 volt auto battery which is also supplying the SG3524. I measure 12.4 volts into the 4427 as Vdd. I would expect, reading the datasheet that I should be getting the Vdd less .025v as the output pulse voltage. Thinking that I might have damaged the chips, I bought some new ones. I still only get a low output. Also, I cannot see on the datasheet if there is a low output coded 4427 for driving logic chips, which might require 5 volts.

    Could someone please help me understand what might be going on?

    Thanks
     
  2. shortbus

    AAC Fanatic!

    Sep 30, 2009
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    1,525
    Post your schematic for help. We don't know what your circuit is.
     
  3. bobbie

    Thread Starter New Member

    Jan 26, 2010
    22
    0
    Hi there,
    thanks for the reply. I shall draw up a schematic and post it later. However, that will be purely academic. I have a simple series of connections to the TC4427. a negative, a positive 12 v and a 5 volt input pulse. I would expect the output pulse to be close to the Vdd. It is not. I have not found a rerefence to this anomaly. As I am able to directly couple the SG 3524 to the input of the TC4427, I would expect the output to be the regulated Vdd. I suppose the real question I should be asking is, what am I missing here? The datasheet I have suggesta a 5v input for a Vdd output.

    Thanks
     
  4. shortbus

    AAC Fanatic!

    Sep 30, 2009
    4,004
    1,525
    A schematic should be used for any circuit, for future reference on a project, yours or someone in the future.

    If your using a SG3524 to trigger a low side switch, why not do away with the mosfet driver? The SG 352x series of ICs is made to drive mosfets in the low side without a driver.
     
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