Dell Power Supply
liam525000
Entry ID #: 4133
Created: Wed, Jan 11, 2017 10:54 PM
I found this power supply in a desktop that had been sitting in my basement for around 10 years, and, after identifying it as a Dell PS-5251-2DS 250W power supply, thought it would be perfect for this challenge. As I opened it up, I found plenty of capacitors and transformers, but no chips were visible. However, after moving some of the bigger things out of the way, I managed to find a few: One TSM1110N voltage/current supervisor One UC3845BN PWM controller One TNY267P off-line switcher Three B17B high voltage rectifiers The current supervisor is a form of surge protection, as it is one of the first things connected to the mains supply. After that, a bunch of capacitors and other things take up a large portion of the board, followed by some large heatsinks around the two transformers. On this side of the board there are the other chips, with the rectifiers converting from AC to DC, the switcher providing fault protection and the PWM controller does something?
