Yes, one of these...
I pulled this one out of a computer and opened it up to find it filled with bloaters. Still working when I removed it, oddly enough.
To my surprise, it seems to be a much better build than most Young Year (OEM Sun Pro) makes.
(Hardware Secrets article here)
It has a complete transient filter (2 X/2 Y capacitors, 3 filter coils, 1 NTC thermistor and an MOV). The rectifying bridge is a PBU805, rated 8 amps at 100°C. At 120V, this gives a limit of 960W, well within spec. The two switchers are NPN C5071, rated for 24A pulse / 12A continuous. Since it is in switch mode, the 24A rating is what we use. This also appears to be sufficient for the 520W rating of the unit. The transformer seems to be of sufficient size as well. The 5VSB is provided by a C5353 transistor, rated at 5A pulse / 3A continuous. This meets the rating of the 5VSB rail, which is at 2A.
On the secondary side, it has the following: A SBL3040PT Schottky rectifier for the 12V line, rated for 30A @ 100°C. This gives 360W, a bit shy of the 34A/408W rating for the 12V line. Assuming the unit is rated at 25°C as most cheap PSUs are, this would allow for that rating to be in spec, since diodes can handle more current at lower temperatures (just don't stick it in a really hot case). The 5V line also uses a SBL3040PT rectifier, so it too is limited to 30A. The unit is rated for 29A on the 5V rail, so this is within the limit. The 3.3V line is on a MBR30100PT rectifier, also rated at 30A. The 3.3V rail is specified at 30A, so this is right at the limit.
All in all, it seems a decent power supply for the budget range. Would it hit its 520W rating? Probably not. I don't have the equipment to test it, but I'm assuming it could manage around 480W or so.
Of course, the Achilles heel of this unit is the bad caps they used (mostly YC in this case). Should do much better once I get this recap finished.
I pulled this one out of a computer and opened it up to find it filled with bloaters. Still working when I removed it, oddly enough.
To my surprise, it seems to be a much better build than most Young Year (OEM Sun Pro) makes.
(Hardware Secrets article here)
It has a complete transient filter (2 X/2 Y capacitors, 3 filter coils, 1 NTC thermistor and an MOV). The rectifying bridge is a PBU805, rated 8 amps at 100°C. At 120V, this gives a limit of 960W, well within spec. The two switchers are NPN C5071, rated for 24A pulse / 12A continuous. Since it is in switch mode, the 24A rating is what we use. This also appears to be sufficient for the 520W rating of the unit. The transformer seems to be of sufficient size as well. The 5VSB is provided by a C5353 transistor, rated at 5A pulse / 3A continuous. This meets the rating of the 5VSB rail, which is at 2A.
On the secondary side, it has the following: A SBL3040PT Schottky rectifier for the 12V line, rated for 30A @ 100°C. This gives 360W, a bit shy of the 34A/408W rating for the 12V line. Assuming the unit is rated at 25°C as most cheap PSUs are, this would allow for that rating to be in spec, since diodes can handle more current at lower temperatures (just don't stick it in a really hot case). The 5V line also uses a SBL3040PT rectifier, so it too is limited to 30A. The unit is rated for 29A on the 5V rail, so this is within the limit. The 3.3V line is on a MBR30100PT rectifier, also rated at 30A. The 3.3V rail is specified at 30A, so this is right at the limit.
All in all, it seems a decent power supply for the budget range. Would it hit its 520W rating? Probably not. I don't have the equipment to test it, but I'm assuming it could manage around 480W or so.
Of course, the Achilles heel of this unit is the bad caps they used (mostly YC in this case). Should do much better once I get this recap finished.
Comment