PIC Controlled Current Source

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  1. - 29th June 2007, 12:28 #1
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    Hi, Ioannis

    LMC 662 is fine ...

    358 and 324 are only able to follow a 0v INPUT ...

    I juste reported my own experience with a CdNi home made charger based upon the ICS 1700 ...

    The current sources and sinks were designed around a ... LMC660 !!!

    but I used Darlington transistors to get rid of Rail-to-rail issues ...

    Alain
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  2. - 29th June 2007, 13:10 #2
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    Quote Originally Posted by Acetronics View Post
    ...
    The current sources and sinks were designed around a ... LMC660 !!!
    Hmm, what a surprise!

    The only problem that I had with the LMC66x was with +5V supply and near 5V input. They tend to lock the output like a switch even when they were connected as buffer. With a supply of 6 or more volts from seperate source, everything was just fine.

    Ioannis
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  3. - 29th June 2007, 13:26 #3
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    Hi, Ioannis

    If you have a look to the Input common mode voltage range ...

    no surprise ...

    Alain
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  4. - 30th June 2007, 01:30 #4
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    Hello Ioannis and Alain,

    Thanks for your replies - exactly what I was after. I was having one of those days where I couldn't think straight and I was overlooking the obvious solution.

    BTW - I have had success using the TS951/952/954 series of RRIO op-amps. The data sheet states "latch-up immunity", so they may be a suitable device in your application Ioannis. I haven't experienced any problems with them. Pricing and specs are are similar to LMC660.

    Regards,

    Andy
  5. - 30th June 2007, 18:15 #5
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    OK, thanks. I'll check them out. Glad was of any help.

    Ioannis
    www.signalcom.gr
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