I have an Antec TruePower 450 Watt PSU that I am trying to repair, and I have two questions about it.
First, it has an NTC thermistor that is SCK 2R512 that is cracked and I would like to replace it. I pulled the data sheet on it and discovered that it is 2.5Ω with a current rating of 12A and a whole bunch of other datapoints that I don't recall off the top of my mind. In doing a search for a matching NTC thermistor on mouser and digikey, I was unable to find an exact match. The closest I found was an EPCOS B57364S259M, which matches that 2.5Ω spec, but only rates at 11A and none of the other constants match. Would this part be an appropriate replacement for the SCK 2R512? Further, what are the important specifications in choosing an NTC thermistor, so that I know what to look for in the future?
My second question is one that is much more academic. This power supply and my PC Power and Cooling Silencer that I have taken apart both have what appear to be wire wound resistors that are mounted to one of the large heatsinks inside the PSU. I couldn't help but notice that this resistor was not present in any of the no name PSUs that I used to see cross my workbench back when I was a PC repair tech back in the days when PSUs came free with the case. So, I am just curious what is the function of this resistor, and why does it seem to only be present in higher end power supplies?
Thanks,
Justin
First, it has an NTC thermistor that is SCK 2R512 that is cracked and I would like to replace it. I pulled the data sheet on it and discovered that it is 2.5Ω with a current rating of 12A and a whole bunch of other datapoints that I don't recall off the top of my mind. In doing a search for a matching NTC thermistor on mouser and digikey, I was unable to find an exact match. The closest I found was an EPCOS B57364S259M, which matches that 2.5Ω spec, but only rates at 11A and none of the other constants match. Would this part be an appropriate replacement for the SCK 2R512? Further, what are the important specifications in choosing an NTC thermistor, so that I know what to look for in the future?
My second question is one that is much more academic. This power supply and my PC Power and Cooling Silencer that I have taken apart both have what appear to be wire wound resistors that are mounted to one of the large heatsinks inside the PSU. I couldn't help but notice that this resistor was not present in any of the no name PSUs that I used to see cross my workbench back when I was a PC repair tech back in the days when PSUs came free with the case. So, I am just curious what is the function of this resistor, and why does it seem to only be present in higher end power supplies?
Thanks,
Justin
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