This psu sure has tiny heatsinks and since I have some leftovers parts from other fsp psus I decided to beef this one up a bit. I'm going to experiment with changing other components too and see the effect. Maybe configure it for higher output.
This model had 9n50c fets for the pfc and 5n50c on the primary. I changed the 5 amp fets to 9amp ones and fit a bigger heatsink. All of the heatsinks are at least 1/3 times larger now. Input cap was a 150uF OST which I replaced with a 220uF Rubycon. The psu had a 4 amp bridge diode so I put in an 8 amp instead. The glue on the original pfc coil is burned. The coil itself looks ok...
I also replaced some of the caps next to the heatsinks and fit bigger filter coils.
The total cost was really bargain, I used junk and new stuff I already had on stock. Hope it wasn't wasted
Testing the unit with load gave some issues. The 3.3 rail gets 3.57volts high and there is a slight whining noise. If I adjust the regulation the noise stops but the voltages get too low. I also noticed that the common coil for 5 and 12 Volt gets slightly warm. I was tracking back the 3.3 sense line but couldn't figure out which resistor to adjust to lower the voltage. I'm really curios about ripple so next week I'll take this unit to work and measure the outputs with a scope.
This model had 9n50c fets for the pfc and 5n50c on the primary. I changed the 5 amp fets to 9amp ones and fit a bigger heatsink. All of the heatsinks are at least 1/3 times larger now. Input cap was a 150uF OST which I replaced with a 220uF Rubycon. The psu had a 4 amp bridge diode so I put in an 8 amp instead. The glue on the original pfc coil is burned. The coil itself looks ok...
I also replaced some of the caps next to the heatsinks and fit bigger filter coils.
The total cost was really bargain, I used junk and new stuff I already had on stock. Hope it wasn't wasted
Testing the unit with load gave some issues. The 3.3 rail gets 3.57volts high and there is a slight whining noise. If I adjust the regulation the noise stops but the voltages get too low. I also noticed that the common coil for 5 and 12 Volt gets slightly warm. I was tracking back the 3.3 sense line but couldn't figure out which resistor to adjust to lower the voltage. I'm really curios about ripple so next week I'll take this unit to work and measure the outputs with a scope.
Attached Files
you have it hooked up to a kill a watt to see how far it could go? What kind of protections does it have?
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