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Help identifying a 6-pin SMD IC in a power supply.

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Circlotron:
The way it is drawn is difficult to follow but it looks like some kind of non-isolated buck regulator with the ground reference point of the control ic flapping up and down with the inductor input voltage.

GonzoTheGreat:
Going out on a limb:  Perhaps the power MOSFET and this Mystery IC came in some kind of a kit from the same manufacturer.
So if we could identify who made this MOSFET, maybe that will also point to the manufacturer of this IC.

The logo on the MOSFET does not resemble Signetics nor Siliconix.  Any ideas who made it ? 
See the photo attached below.

GonzoTheGreat:

--- Quote from: Circlotron on October 21, 2017, 02:12:20 am ---The way it is drawn is difficult to follow but it looks like some kind of non-isolated buck regulator with the ground reference point of the control ic flapping up and down with the inductor input voltage.

--- End quote ---
Indeed it is a non-isolated constant current regulator (320mA, 50-80VDC out).  I admit, it was my assumption that Pin2 is the GND.
What would be a better way of drawing the schematic?

P.S.
Indeed, the scope shows the Pin2 flapping at 24kHz.

iainwhite:
Re: the MOSFET

I did a google search for D5N50 and came up with a SiHD5N50D Mosfet from Vishay Siliconix   - do you think that is it? Could it be an earlier logo for Siliconix ??



Update:
I put the phrase "Siliconix C1EH"  into google and it pointed me to a Texas Instruments step down TPS64203 regulator

Maybe i'm running off in the wrong direction here  ??

GonzoTheGreat:

--- Quote from: iainwhite on October 23, 2017, 05:05:42 pm ---I did a google search for D5N50 and came up with a SiHD5N50D Mosfet from Vishay Siliconix   - do you think that is it?

--- End quote ---
I don't think so because if you zoom-in the photo of the blown MOSFET, its number appears to be ?SD5N50 since there is a fragment of the letter "S" in front of the "D".
 

--- Quote from: iainwhite on October 23, 2017, 05:05:42 pm ---Could it be an earlier logo for Siliconix ??

--- End quote ---
The entire device is maximum 2 years old  ...and I don't think that DPAK cases existed 15 years ago.


--- Quote from: iainwhite on October 23, 2017, 05:05:42 pm ---I put the phrase "Siliconix C1EH"  into google and it pointed me to a Texas Instruments step down TPS64203 regulator

--- End quote ---
That was a good try but the pinout is different and I cannot find the string "C1EH" anywhere in the TPS64203 datasheet.

Thanks for trying  :)

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