help finding data on this IC

Discussion in 'Electronics Repair' started by Maxwell, Jan 5, 2017.

  1. Maxwell

    Maxwell

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    Hey,

    I can't seem to find any data on this IC. It's a frequency generator for an SMPS, but i'm not sure about it's output, frequency, power etc.

    I'm looking for a replacement as this IC is no longer generating a signal, but unsure what to get. There seem to be plenty available of these from china, but i'm not looking to wait quite that long.

    Power Intergrations CP3001RN, i'm assuming it's a TO263 package?
     

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    Maxwell, Jan 5, 2017
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  2. Maxwell

    Maxwell

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    I'm thinking about replacing it with the TOP242R, has a 15 watt output and selectable frequency of 66 or 132Khz. The sheet said it takes AC input but the reference design includes a full wave rectifier so, considering the psu has a full bridge rectifier i think i'm solid, that is if the frequency is compatible... I have no idea, but most of these seem to operate on either 66khz or 130khz, so i guess that should work either way? 15Watts seems plenty for this board...

    Jumping into the deep i guess
     
    Maxwell, Jan 6, 2017
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  3. Maxwell

    davenn Moderator

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    I think you don't quite understand what these chips do.
    They are switching controller IC's. They DONT have an output. They sample the voltage from the DC output side of the of the PSU and use that to control the
    switching duty cycle (switching speed) if the FET. This FET is in the transformer primary circuit of the SMPS.
    varying the duty cycle keeps the output voltage steady ... ie. regulated

    am still looking for data on your original chip
     
    davenn, Jan 6, 2017
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  4. Maxwell

    Maxwell

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    The way i understand this chip is that it's a switch, just like any other transistor, but with added features. It has a current output, ie it passes current through it, so it has a max output power, right?

    So my questions/concerns about it are as follows:

    - Frequency: mostly i see these chips have either 66khz or 130khz operation. So if the transformer is designed to operate with > 66Khz, and the switch isn't, the output on the secondary side will either be too low or will drop out when too much current is drawn from it.

    - Max rated power: These chips have a max power rating, I'm assuming 15 watts will be enough, but I don't really know that for sure. Why i'm assuming this is because other boards that I've seen that have a similar build have chips on them rated 15 watts or less.

    - Drain voltage: The datasheet for similar chips say it's main voltage rated, but that seems to be the line input, not the drain pin voltage. I measured about 30 Volts on the pin, but not sure that it is what it's supposed to be, also different chips have varying input tolerance on the drain pin, so yeah, issues.

    I picked the TOP 242R because it can go up to 132Khz, or operate in 66Khz mode by setting the frequency pin, has a max output of 15w and because it seems to take up to 700v on the drain pin.

    I understand there's a lot more to it than this however. There's a lot of data on this device, half of which I have only a vague idea of what it means, The chips seems to fit the bill from my limited understanding of it's main function. The rest I have no idea of, hence jumping in the deep.

    I believe this chip is a custom job. It's mode by power integration for sure, but they don't have any data on it. This board comes out of a Miele appliance, and I suspect that power integration made this chip custom for Miele. Like i said, there's a lot of knock off's available from china, but waiting 2 months for a shipment is not what i had in mind.
     
    Maxwell, Jan 7, 2017
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  5. Maxwell

    davenn Moderator

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    no, it doesn't supply a current output ... ... passing current and outputting current are two different things


    that signal doesn't leave the chip ... it is just the frequency that the internal FET is switched at
    so Im not sure how you determined that it wasn't present

    yes, the power rating of the FET when a given voltage and current are present

    it should do the same thing (looking at the datasheet) .... beware tho that it may not be pin for pin compatible ... I still cant find data on your original chip

    consider that the chip may be OK and it is the control signal to it via a opto-coupler that may be missing
     
    davenn, Jan 7, 2017
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  6. Maxwell

    Maxwell

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    Right, so it just needs to be rated to pass enough current then?


    I probed the drain pin and did not see a PWM signal there. It's getting 30V DC.


    The optocoupler read 0v DC.
     
    Maxwell, Jan 8, 2017
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