S-10-5 power supply schematic etc. 5V 2A

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  • redwire
    Badcaps Legend
    • Dec 2010
    • 3900
    • Canada

    #1

    S-10-5 power supply schematic etc. 5V 2A

    I got a 5V 2A power supply for some hobby projects from Aliexpress store YXD Wish for about $4. S-10-5 and the build quality good, solder blob under transformer and a solder balls on the PCB top so I cleaned that up.

    Powered it up, get 5.0V but when connecting a load resistor it cratered. At 10R load which should be 0.5A, it dropped to 3.8V out and it went into hiccup mode below 5 ohms. About 1.5W output is all I can get.
    I drew out the schematic and poked around with a scope. It's running slow at 31kHz and primary current pulses are measly 30mA. So I think the IC is fake and not working, it has no markings.
    It appears to be a TX203H alternates are CR6203, RM6203, SDC603, SW2604, SL2128B. Commonly used in wall warts.
    (The bottom rung version of this same S-10-5 using phenolic PCB, uses IC DK1203 Dongke Semi and no current-sense resistor, and cheapened other stuff.)

    I asked for a refund and so far the vendor is quiet... I had another one ordered from a different Ali store but the floods took out rail and highways to the coast so it will be a while to get here and compare.

    Don't forget website comparing pinouts of SMPS IC's. Good tool to reverse-engineer the IC used when there are no markings or it popped.
    Attached Files
  • stj
    Great Sage 齊天大聖
    • Dec 2009
    • 30944
    • Albion

    #2
    Re: S-10-5 power supply schematic etc. 5V 2A

    i would only buy MeanWell stuff at this point.
    they arent piss-cheap but they arent crap either
    https://meanwellonline.aliexpress.com/store/5429250

    Comment

    • sam_sam_sam
      Badcaps Legend
      • Jul 2011
      • 6025
      • USA

      #3
      Re: S-10-5 power supply schematic etc. 5V 2A

      Has anyone used this type of switching power supply

      Brand : Mean Well
      Model : PSC-160A-C
      Output CH1 : 13.8V / 7.6A
      Output CH2 : 13.8V / 4A (Battery charge)
      Rated Power : 160W

      Comment

      • stj
        Great Sage 齊天大聖
        • Dec 2009
        • 30944
        • Albion

        #4
        Re: S-10-5 power supply schematic etc. 5V 2A

        you probably need to ask on a cb radio forum with that output

        Comment

        • redwire
          Badcaps Legend
          • Dec 2010
          • 3900
          • Canada

          #5
          Re: S-10-5 power supply schematic etc. 5V 2A

          The problem with these smaller power supply modules, they're always missing parts to be cheap.
          I look for: a fuse, common-mode choke/X-cap for EMC, NTC and decent sized primary cap. It's too much to ask. A name-brand AC wall-wart has all of that. But who wants to glue that down in your enclosure.
          I have another board, high quality - but the transformer runs pretty hot even at 1A load.

          In the 10W league, it's cheap chinese open-frame, or "high end" $20 potted modules like CUI PSK-S12B module. CUI VOF-10B rated 3-year life and has Teapo caps. UGH.
          Meanwell I'd looked at it was all big, 25W-50W is the smallest ,then the potted modules IRM-10-5V but who knows what's inside.
          Popular is the Hi-Link HLK-PM01 modules but no fuse, no input EMC filter.

          I'll keep looking, it seems easier to mod a cheap open-frame one.

          Comment

          • lti
            Badcaps Legend
            • May 2011
            • 2547
            • United States

            #6
            Re: S-10-5 power supply schematic etc. 5V 2A

            Delta also has some decent power supplies (although I saw a big fan-cooled one that appeared to adjust fan speed based on load instead of temperature), but they only go down to 15W.

            Comment

            • CapLeaker
              Leaking Member
              • Dec 2014
              • 8018
              • Canada

              #7
              Re: S-10-5 power supply schematic etc. 5V 2A

              I used a shitload of these Meanwell power supplies mainly wall warts. So far I had good luck with them, zero problems. I also used bigger Delta power supplies and they were also good.

              Redwire: that link doesn’t work for me.

              Comment

              • eccerr0r
                Solder Sloth
                • Nov 2012
                • 8677
                • USA

                #8
                Re: S-10-5 power supply schematic etc. 5V 2A

                Originally posted by redwire
                Don't forget website comparing pinouts of SMPS IC's. Good tool to reverse-engineer the IC used when there are no markings or it popped.
                Should there be punycode here instead of *'s?

                Comment

                • sam_sam_sam
                  Badcaps Legend
                  • Jul 2011
                  • 6025
                  • USA

                  #9
                  Re: S-10-5 power supply schematic etc. 5V 2A

                  Originally posted by CapLeaker
                  I used a shitload of these Meanwell power supplies mainly wall warts. So far I had good luck with them, zero problems. I also used bigger Delta power supplies and they were also good.

                  Redwire: that link doesn't work for me.
                  It does not work for me either

                  Comment

                  • lotas
                    Badcaps Legend
                    • Jan 2016
                    • 4479
                    • Russia

                    #10
                    Re: S-10-5 power supply schematic etc. 5V 2A

                    "****************/ic_power/"

                    Comment

                    • redwire
                      Badcaps Legend
                      • Dec 2010
                      • 3900
                      • Canada

                      #11
                      Re: S-10-5 power supply schematic etc. 5V 2A

                      The URL for the Russian website comparing pinouts of SMPS IC's gets turned into asterisks here like this: ht tps://****************/ic_power/
                      Trying to post them, just delete the spaces to get the URL:
                      Home page: h ttps:/ / remont-aud . n e t /load
                      AC-DC SMPS IC identification: h ttps:/ / remont-aud . n e t /ic_power/
                      DC-DC SMPS IC identification: h ttps:/ / remont-aud . n e t /dc_dc/
                      Some service manuals there too, use google translate.

                      Aliexpress store YXD Wish said nothing about their dud S-10-5 power supply, sent them pics too. "Aliexpress guaranteed return shipping" means... I have to pack it up and pay probably $15 to send it back to china. UGH

                      Good news, the second power supply came in and I will post pics and schematic. At least it works.
                      Last edited by redwire; 11-30-2021, 07:28 PM.

                      Comment

                      • CapLeaker
                        Leaking Member
                        • Dec 2014
                        • 8018
                        • Canada

                        #12
                        Re: S-10-5 power supply schematic etc. 5V 2A

                        Originally posted by redwire
                        The URL for the Russian website comparing pinouts of SMPS IC's gets turned into asterisks here like this: ht tps://****************/ic_power/
                        Trying to post them, just delete the spaces to get the URL:
                        Home page: h ttps:/ / remont-aud . n e t /load
                        AC-DC SMPS IC identification: h ttps:/ / remont-aud . n e t /ic_power/
                        DC-DC SMPS IC identification: h ttps:/ / remont-aud . n e t /dc_dc/
                        Some service manuals there too, use google translate.

                        Aliexpress store YXD Wish said nothing about their dud S-10-5 power supply, sent them pics too. "Aliexpress guaranteed return shipping" means... I have to pack it up and pay probably $15 to send it back to china. UGH

                        Good news, the second power supply came in and I will post pics and schematic. At least it works.
                        Thanks redwire!

                        Comment

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