Rechargable LED circuit 16W 220AC volt

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  • claws77
    Senior Member
    • Apr 2024
    • 99
    • India
    #1

    Rechargable LED circuit 16W 220AC volt

    unamed controller ic , one diode bridge
    MLS3535A Mosfet (guess), A1sHB mosfet. 12 1W leds, 10 0.5W leds, bunch of resistors, one capacitor, 2 zener diodes

    blown MLS3535A, removing and testing shows OL in diode mode all combination tested. (Pin 1, pin2-3-4, pin 5678 connected) after removing this component

    without MLS3535A, AC powered, voltage between Pin234 and Pin5678 is 80V DC, 60V AC, and the outer most ring of 12 LED( 1W) glows faintly.

    please help diagnose
    Attached Files
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    • claws77
      Senior Member
      • Apr 2024
      • 99
      • India
      #2
      made a mistake, due to ripped gate pad from pcb
      Click image for larger version Name: image.png Views: 0 Size: 455.7 KB ID: 3301216

        Comment

        • CapLeaker
          Leaking Member
          • Dec 2014
          • 8146
          • Canada
          #3
          That MLS3535 is a current controlled LED driver. There are a lot of complaints with lights that use this LED driver. What is U2? Can’t see it on the pic, but has something to do with the charger.
          Overall this lamp must be flickering a bit, since there is no bulk capacitor after the rectifier?

            Comment

            • claws77
              Senior Member
              • Apr 2024
              • 99
              • India
              #4
              CapLeaker , flickering was indistinguishable when it was working fine,
              i am thinking of shorting the Mosfet with wire between the Source and Drain.

              maybe add a capacitor for good measure between +ve 320 and -ve (gnd).

                Comment

                • CapLeaker
                  Leaking Member
                  • Dec 2014
                  • 8146
                  • Canada
                  #5
                  You do know that LEDs are current controlled, not voltage controlled. This MLS chip is a current controlled LED driver. I guess as for flickering, some people are more sensitive than others and it is a big complaint with this MLS chip.

                    Comment

                    • claws77
                      Senior Member
                      • Apr 2024
                      • 99
                      • India
                      #6
                      CapLeaker the leds on outer ring are rated 18V and 1W ie they draw 55.56 mA current, so can I just replace the MLS chip with any other mosfet that can handle/give the the required current?

                      and capacitor of value 600 uF , 400V will give 1 V ripple, for 50 Hz input frequency and 60 mA current. calculated using C = I/(2*f*V_pp)

                        Comment

                        • stj
                          Great Sage 齊天大聖
                          • Dec 2009
                          • 31015
                          • Albion
                          #7
                          is this one of those things that looks like a lamp bulb?
                          is it the lithium one or the lead-acid one?

                            Comment

                            • claws77
                              Senior Member
                              • Apr 2024
                              • 99
                              • India
                              #8
                              Click image for larger version Name: image.png Views: 0 Size: 15.1 KB ID: 3301603, Lead Acid Battery

                              i don't understand this thing in my circuit.
                              the outer ring LEDs are 56 mA 18V 1W but inner ring LEDs are 167mA 3V 0.5W but they are connected in series as per tracing and schematic.

                              so what is limiting?
                              will the LEDs take 56 mA or 167 mA on AC?

                              on dc this is not a problem as the outer ring is turned off via a mosfet.

                                Comment

                                • stj
                                  Great Sage 齊天大聖
                                  • Dec 2009
                                  • 31015
                                  • Albion
                                  #9
                                  does this help?
                                  https://www.youtube.com/watch?v=sax9unx76Kg

                                    Comment

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