Help identifying IC

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.

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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

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I removed the known good one from the working supply, and it reads like a s tandard npn on the diode scale on one side, the other side reads like maybe a 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 some resistance 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'm going on memory. Thanks for the reply.

SOT23 transistor. Here's what it looks like:

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.

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.

suffix to help identify this thing, I'd really appreciate it.

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

an SOT23 transistor. Here's what it looks like:

d. The board legend calls it an IC, but I've seen similar devices marked a s transistors, and it looks like a transistor array. The markings on the d evice 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 inform ation about it.

has 6M944a on the device. The boards are otherwise identical, so these tw o devices appear to be interchangeable. Neither Mouser or DigiKey seem to have anything on it.

or suffix to help identify this thing, I'd really appreciate it.

You're probably correct Bill. I took another look at that board today, and there 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 sch ematic and parts ID, but I know they're going to blow me off on this. Mean while, 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 nu mber (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.

On Thu, 21 Feb 2013 19:22:57 -0800 (PST), John-Del put finger to keyboard and composed:

IC on that particular leg, so that six >pinner could be the smps control.

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

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Please remove one 'i' from my address when replying by email.

On Thu, 21 Feb 2013 19:22:57 -0800 (PST), John-Del put finger to keyboard and composed:

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 ...

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 ...

... which refers to this IC:

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

--
Please remove one 'i' from my address when replying by email.