FSP250-60GEN heatsink mod and tweak

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  • pdavid
    Badcaps Veteran
    • Jan 2011
    • 279
    • Hungary
    #1

    FSP250-60GEN heatsink mod and tweak

    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.
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    • Pentium4
      CapXon Be Gone
      • Sep 2011
      • 3741
      • USA
      #2
      Re: FSP250-60GEN heatsink mod and tweak

      That's awesome! you have it hooked up to a kill a watt to see how far it could go? What kind of protections does it have?

        Comment

        • ben7
          Capaholic
          • Jan 2011
          • 4059
          • USA
          #3
          Re: FSP250-60GEN heatsink mod and tweak

          Gr8!

          I would get better caps in the secondary though

          The whining may be just normal inductor noise, or it could be an unstable feedback loop.
          Muh-soggy-knee

            Comment

            • pdavid
              Badcaps Veteran
              • Jan 2011
              • 279
              • Hungary
              #4
              Re: FSP250-60GEN heatsink mod and tweak

              Originally posted by Pentium4
              That's awesome! you have it hooked up to a kill a watt to see how far it could go? What kind of protections does it have?
              It could probably do 250W or more. The protection is handled by the Ps223 and I'll try to mod some adjustable 3.3 rail.

              Originally posted by ben7
              Gr8!

              I would get better caps in the secondary though

              The whining may be just normal inductor noise, or it could be an unstable feedback loop.
              Yeah those ost caps are a bit risky. Every single one is a 1000uF/16V and they test okay. The diameter 8mm as always in these gln/gly/hen/gen fortons, as far as I know.

              This psu also had seperate 0.8Amp 12V output, but I removed that part and now there is an empty space on the pcb.
              I really want to figure if this noise thing is a real problem. I just don't have a scope at home... yet.

                Comment

                • ben7
                  Capaholic
                  • Jan 2011
                  • 4059
                  • USA
                  #5
                  Re: FSP250-60GEN heatsink mod and tweak

                  Originally posted by pdavid
                  It could probably do 250W or more. The protection is handled by the Ps223 and I'll try to mod some adjustable 3.3 rail.

                  Yeah those ost caps are a bit risky. Every single one is a 1000uF/16V and they test okay. The diameter 8mm as always in these gln/gly/hen/gen fortons, as far as I know.

                  This psu also had seperate 0.8Amp 12V output, but I removed that part and now there is an empty space on the pcb.
                  I really want to figure if this noise thing is a real problem. I just don't have a scope at home... yet.
                  Use a tube or fat straw to listen to where the sound is coming from, and the straw keeps your ear safely away from HV
                  Muh-soggy-knee

                    Comment

                    • pdavid
                      Badcaps Veteran
                      • Jan 2011
                      • 279
                      • Hungary
                      #6
                      Re: FSP250-60GEN heatsink mod and tweak

                      So, the sound comes from all the chokes There wasn't any before the mod. Maybe I shouldn't have "upgraded" to bigger ones.
                      Also I'm going to get a scope soon. I just can't bring stuff to work all the time anymore... kind of.

                        Comment

                        • ben7
                          Capaholic
                          • Jan 2011
                          • 4059
                          • USA
                          #7
                          Re: FSP250-60GEN heatsink mod and tweak

                          Originally posted by pdavid
                          So, the sound comes from all the chokes There wasn't any before the mod. Maybe I shouldn't have "upgraded" to bigger ones.
                          Also I'm going to get a scope soon. I just can't bring stuff to work all the time anymore... kind of.
                          Hm, maybe you should upgrade the caps xD
                          Muh-soggy-knee

                            Comment

                            • pdavid
                              Badcaps Veteran
                              • Jan 2011
                              • 279
                              • Hungary
                              #8
                              Re: FSP250-60GEN heatsink mod and tweak

                              Originally posted by ben7
                              Hm, maybe you should upgrade the caps xD
                              I did put back the original magamp choke and that fixed a 3.3V issue and the noise too. I won't touch the OST caps for now.
                              The pfc coil gets a bit hot according to the probe it's 50-61C degrees. It originally had burned glue on it anyway.

                                Comment

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