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ISO124: ISO124: Power supply question

Abhishek Singh2
Prodigy 220 points
Part Number: ISO124
Other Parts Discussed in Thread: ISO224

Hello,

I'm using ISO124 in my design and I'm currently doing initial tests on my PCB and I have power supply limitations for these initial tests at the moment. So I had some couple of questions regarding it.

Q1. Will ISO124 be damaged its functionality be affected in any way if same bipolar supply (+/- 15V) is used in for +/- VS1 and +/- VS2?

Q2. If only one side power supply +/-VS1 (+/-15 V) is provided in the IC then will it create any problems on the other side or in the IC?

Regards,
Abhishek K Singh

  • 0
    TI__Guru 55662 points

    Hi Abhishek,

    Out of curiosity, what are you designing and how are you using the ISO124? Can you share a little information about your application? 

    Q1: The ISO124 will not be damaged if the same supply is used for VS1 and VS2. However separate power supplies for VS1 and VS2 are required in order to maintain the isolation barrier, as using the same power supply would provide an additional path over the isolation barrier. 

    Q2: If only one side of the ISO124 is powered, I would expect no problems for the other side, however the device will not be operational. 

    Please let me know if you have additional questions or concerns. 

  • 0 in reply to Alexander Smith
    Prodigy 220 points

    Hello Alexander,

    Thank for the clarification. I'm using this isolation amplifier in electronics for an actuation system where redundancy and isolation is required. I was using optocouplers earlier but their gain variation with temperature was not meeting my requirements. Also the unity gain, higher output voltage capabilities and better performance of this IC suited my interface requirements. Currently I have limitations on power supply for performing initial testing my designed PCB, hence I had these questions. 

    Regards,

    Abhishek K Singh

  • 0 in reply to Abhishek Singh2
    TI__Guru 55662 points

    Hi Abhishek,

    Thank you for providing some background on you project I would be happy to facilitate your transition. May I ask what the actuator is controlling? 

    The wide 14mm package of the ISO124 provides additional isolation protection. Do you know if this wide body is necessary for your application?  

    If not, you may want to look at the ISO224, which is a newer generation device. This device still has the wide +/-12V input range and internal gain of 1/3, but can operate from two unipolar 5V supplies via internal charge pump on the high side - much easier to design for. Do you think this device would meet your requirements?