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Help identifying IC

Discussion in 'Electronic Repair' started by John-Del, Feb 20, 2013.

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  1. John-Del

    John-Del Guest

    It's an smd device with six legs, three on each side, about the size of an SOT23 transistor. Here's what it looks like:

    http://www.icbank.com/icbank_data/semi_package/tsop6_dim.pdf

    It's used in the primary side of a smps regulator on a power supply board. The board legend calls it an IC, but I've seen similar devices marked as transistors, and it looks like a transistor array. The markings on the device are KP 358, with an "I" in a box preceding the KP. If I Google just that number, Google returns datasheet sites, but they don't have any information about it.

    I have another identical working supply, but the IC in the same location has 6M944a on the device. The boards are otherwise identical, so these two devices appear to be interchangeable. Neither Mouser or DigiKey seem to have anything on it.

    If anyone knows what this is, what it subs to, or even a missing prefix or suffix to help identify this thing, I'd really appreciate it.
     
  2. N_Cook

    N_Cook Guest

    It's an smd device with six legs, three on each side, about the size of an
    SOT23 transistor. Here's what it looks like:

    http://www.icbank.com/icbank_data/semi_package/tsop6_dim.pdf

    It's used in the primary side of a smps regulator on a power supply board.
    The board legend calls it an IC, but I've seen similar devices marked as
    transistors, and it looks like a transistor array. The markings on the
    device are KP 358, with an "I" in a box preceding the KP. If I Google just
    that number, Google returns datasheet sites, but they don't have any
    information about it.

    I have another identical working supply, but the IC in the same location has
    6M944a on the device. The boards are otherwise identical, so these two
    devices appear to be interchangeable. Neither Mouser or DigiKey seem to
    have anything on it.

    If anyone knows what this is, what it subs to, or even a missing prefix or
    suffix to help identify this thing, I'd really appreciate it.

    +++++

    Does cold DVM diode testing suggest a pair of bipolar or powerFET Qs ? or at
    least the same matrix of "diode" results in both cases
     
  3. John-Del

    John-Del Guest


    I removed the known good one from the working supply, and it reads like a standard npn on the diode scale on one side, the other side reads like maybea fet, but there is also a 0.6 drop on the diode scale across the device, so it's more than just two transistors in a case. IIRC, there is also someresistance that can be read across the sides as well. I checked the good one several weeks ago and reinstalled it back in the working supply, so I'mgoing on memory. Thanks for the reply.
     
  4. Guest

    That COULD be a smps controller. While they are usually 8 pin
    devices, 6 pin devices are often found.

    It's been said many times, many ways; a single picture is worth a
    thousand words.

    PlainBill
     
  5. John-Del

    John-Del Guest

    You're probably correct Bill. I took another look at that board today, andthere is no discernible controller IC on that particular leg, so that six pinner could be the smps control. I sent Megmeet an email asking for a schematic and parts ID, but I know they're going to blow me off on this. Meanwhile, I found another junk power supply from Megmeet that is a different, older board, and it has what looks like the same IC, but has a different number (DP50A). It checks the same ohm wise and diode wise, so I'm going to toss that in the board I need to run. Thanks for the info.
     
  6. Franc Zabkar

    Franc Zabkar Guest

    ISTM that you should be able to identify the supply and ground pins.
    There should also be a PWM output pin that either drives an external
    chopper or directly connects to the primary winding of the
    transformer.

    There must also be a feedback pin to sense the supply voltage,
    possibly via an optocoupler that straddles the primary and secondary
    sides. But as Bill said, a photo would be very helpful.

    - Franc Zabkar
     
  7. Franc Zabkar

    Franc Zabkar Guest

    If you are unable to supply a photo, then at least tell us which
    Megmeet product you are talking about. I've done some Google searching
    and I've found tons of PDF documents relating to Megmeet.

    FWIW, I found the following document ...

    http://www.go-gddq.com/down/2013-02/13020412034913.pdf

    .... which refers to this IC:

    http://www.micro-bridge.com/data/on-bright/ob2262.pdf

    The part number is OB2262, so it's not similar to any you've given us,
    but it's function and package style appears to be consistent with
    yours.

    - Franc Zabkar
     
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