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ISO124 isolation amplifier
Related Posts

  • Forum Post: Re: Question on ISO124

    Thomas Kuehl
    Hi, The high-voltage isolation characteristics of the ISO124 are defined across the barrier from one side to the other, input and output. Should the input side ground (earth) rise a few kilovolts relative to the output ground, then the rated isolation barrier voltages would apply; 1.5kV continuous...
    on Mar 8, 2010

  • Forum Post: Re: Question on ISO124

    Thomas Kuehl
    Hello Alex, I don't see anything specifically in the ISO124 data-sheet regrading charge-pump issues. The ISO124 is a legacy product that has been available for a few decades. I suspect that when the data-sheet was written that charge-pumps were not as commonly applied as they are today. Most of...
    on Mar 29, 2010

  • Forum Post: Re: ISO 124

    Bruce Trump
    Perhaps I don't understand. It sounds as if you would be connecting the ground on the input side (call it Gnd-1) to the ground on the output side (Gnd-2). If these ground are connected, you have defeated the purpose of the isolation amplifier. Its sole purpose is to allow these grounds to be galvanically...
    on Jan 12, 2011

  • Forum Post: Problems with ISO124

    Ivan P
    Hi, I'm working with an ISO124 device. The ISO is used for sensing a dc-link voltage (up to 600V) in a 5kW photovoltaic inverter. The schematic is as follows: The ISO apprears to work fine, but when the IGBTs of the converter switches, then fails. In the next figure we can see the input...
    on May 18, 2011

  • Forum Post: Re: Problems with ISO124

    Ivan P
    Bruce, thanks for answering. I have checked this: The damaged ISO124 with +-15V power sources in Vs1 and Vs2. Vin = 7.5V. Decoupling capacitors of 1uF (ceramic). - Resistance between GND1 and GND2: Over the range of the Ohmmeter (over Gigaohms). - Quiescent currents: Ivs1+ = 5.09mA...
    on May 19, 2011

  • Forum Post: Re: iso124 failure issue

    Ivan P
    The maximum output current has a minimum value of 5mA, maybe this is the problem (5V / 1kOhm = 5mA). Why not trying to use a higher resistance value?. The datasheet is rated for a resistance value of 2kOhm, maybe this value is appropiate for you. Please, post the final solution when you find it...
    on May 19, 2011

  • Forum Post: Re: Problems with ISO124

    Ivan P
    Hi Bruce, Again, thanks for answering. The device works, but randomly (coincident with a switching event) it fails, as shown in the figures of the first message in this post. The system is a power inverter, based on an IGBT full bridge topology. The IGBTs switches at 16kHz in order to obtain...
    on May 19, 2011

  • Forum Post: Re: Problems with ISO124

    Ivan P
    Hi Bruce, Sorry for the terminology. What happens is a temporary loss of signal output that recovers in 20micro-seconds (aproximately). This is the problem.
    on May 19, 2011

  • Forum Post: Re: Problems with ISO124

    Ivan P
    Bruce, Thanks for the interest. The problem is solved. The power sources of the output stage where causing the problem, as it becomes very noisy when switching the IGBTs. Addint 47uF capacitors directly in the pins of the device did fixed the problem. Again, thanks for the help. Regards,...
    on May 19, 2011

  • Forum Post: Re: iso124 failure issue

    Ivan P
    William, Maybe an image with the schematic of the four ISO124 can help to found the problem. Can yo attach one? Regards, Iván
    on May 19, 2011

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