Replace hoverboard MOSFET. Any?

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • edugimeno
    Badcaps Veteran
    • May 2017
    • 568
    • Spain

    #1

    Replace hoverboard MOSFET. Any?

    Hi There.,
    I have a hoverboard with a fried RU6888R mosfet
    According to PDF, it is a N channel 68volt 88 Amp MOSFET, TO-220
    Can I just use ANY MOSFET which is N channel, >=68volt, >88Amps, in TO220 format? Also same pin order "GDS"
    I can't find any "official" replacement for this one I'm looking for

    Thanks!
  • stj
    Great Sage 齊天大聖
    • Dec 2009
    • 30917
    • Albion

    #2
    Re: Replace hoverboard MOSFET. Any?

    if you also watch the gate capacitance < relates to switching speed
    and the Rds-ON / on resistance < must be equal or lower or it will generate more heat.

    Comment

    • edugimeno
      Badcaps Veteran
      • May 2017
      • 568
      • Spain

      #3
      Re: Replace hoverboard MOSFET. Any?

      Thanks STJ, will 6mOhm to 8mOhm be noticeable?
      I found IRFB4410 to be a candidate but has these 2 extra mOhms...

      Thanks

      Comment

      • stj
        Great Sage 齊天大聖
        • Dec 2009
        • 30917
        • Albion

        #4
        Re: Replace hoverboard MOSFET. Any?

        that should be fine.

        Comment

        • budm
          Badcaps Legend
          • Feb 2010
          • 40746
          • USA

          #5
          Re: Replace hoverboard MOSFET. Any?

          RU6888R has input capacitance of 2900pF.
          IRFB4410 is 5150pF.
          It may not be turned ON/OFF fast enough, may be the circuit has dead time adjustment.
          https://cdn.badcaps-static.com/pdfs/...19d1be1cc7.pdf
          " Typical values of input (Ciss), output (Coss) and reverse transfer (Crss) capacitances given in the data
          sheets are used by circuit designers as a starting point in determining circuit component values. The data
          sheet capacitances are defined in terms of the equivalent circuit capacitances" Also read about Gate Charge.
          Attached Files
          Last edited by budm; 04-26-2019, 09:35 PM.
          Never stop learning
          Basic LCD TV and Monitor troubleshooting guides.
          http://www.badcaps.net/forum/showthr...956#post305956

          Voltage Regulator (LDO) testing:
          http://www.badcaps.net/forum/showthr...999#post300999

          Inverter testing using old CFL:
          http://www.badcaps.net/forum/showthr...er+testing+cfl

          Tear down pictures : Hit the ">" Show Albums and stories" on the left side
          http://s807.photobucket.com/user/budm/library/

          TV Factory reset codes listing:
          http://www.badcaps.net/forum/showthread.php?t=24809

          Comment

          • edugimeno
            Badcaps Veteran
            • May 2017
            • 568
            • Spain

            #6
            Re: Replace hoverboard MOSFET. Any?

            Ok, but in this case this is for a hoverboard controller board. This mosfet drives one of the 3 coils in a wheel. It will have a switching frequency of 3x Rev Per Second, so basically if the wheel is 5.5" diameter and the max speed is 15kph, max speed will be 10 rps at full speed, so it will probably switch (only af full speed) af 30 Hz. Maybe my maths are a little wrong and it has to switch 2 times for each turn which will give 60 Hz or maybe even double, but we're moving in this range.

            Will this capacitance still be critical in this particular use?

            Thanks!



            Originally posted by budm
            RU6888R has input capacitance of 2900pF.
            IRFB4410 is 5150pF.
            It may not be turned ON/OFF fast enough, may be the circuit has dead time adjustment.
            https://cdn.badcaps-static.com/pdfs/...19d1be1cc7.pdf
            " Typical values of input (Ciss), output (Coss) and reverse transfer (Crss) capacitances given in the data
            sheets are used by circuit designers as a starting point in determining circuit component values. The data
            sheet capacitances are defined in terms of the equivalent circuit capacitances" Also read about Gate Charge.

            Comment

            • stj
              Great Sage 齊天大聖
              • Dec 2009
              • 30917
              • Albion

              #7
              Re: Replace hoverboard MOSFET. Any?

              no, the motor is not driven by one pulse per field for each revolution.

              Comment

              • budm
                Badcaps Legend
                • Feb 2010
                • 40746
                • USA

                #8
                Re: Replace hoverboard MOSFET. Any?

                You need to trace the cicut from the Gate of the MOSFET's to the IC that drives those MOSFET' s, once you find the IC then look up the spec sheet and application notes/circuit then you can see how the Motor is driven.
                Never stop learning
                Basic LCD TV and Monitor troubleshooting guides.
                http://www.badcaps.net/forum/showthr...956#post305956

                Voltage Regulator (LDO) testing:
                http://www.badcaps.net/forum/showthr...999#post300999

                Inverter testing using old CFL:
                http://www.badcaps.net/forum/showthr...er+testing+cfl

                Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                http://s807.photobucket.com/user/budm/library/

                TV Factory reset codes listing:
                http://www.badcaps.net/forum/showthread.php?t=24809

                Comment

                • edugimeno
                  Badcaps Veteran
                  • May 2017
                  • 568
                  • Spain

                  #9
                  Re: Replace hoverboard MOSFET. Any?

                  Someone reverse-engineered an schematic, link here
                  The oulse comes from a microcontroller, 3 transistors are in between the micro and the mosfet

                  Comment

                  • edugimeno
                    Badcaps Veteran
                    • May 2017
                    • 568
                    • Spain

                    #10
                    Re: Replace hoverboard MOSFET. Any?

                    Actually the mosfet in this schematic I linked above, from another hoverboard (but they are all the same), uses an 110n8f6 mosfet with an input capacitance of 9000pF, so this leads me to think that 5000pF may still be good, am I right?

                    Comment

                    • budm
                      Badcaps Legend
                      • Feb 2010
                      • 40746
                      • USA

                      #11
                      Re: Replace hoverboard MOSFET. Any?

                      As you can see, it is 3-phase drive topology. You see how the MOSFET's are connected, if one is not completed OFF while another is on then you will have disaster, since it is MCU based, they can adjust dead times.
                      https://hackaday.io/project/3176-gat...time-insertion
                      http://www.modularcircuits.com/blog/...ridge-control/
                      http://www.ti.com/product/LM5106
                      You can try the substitute and find out.
                      Never stop learning
                      Basic LCD TV and Monitor troubleshooting guides.
                      http://www.badcaps.net/forum/showthr...956#post305956

                      Voltage Regulator (LDO) testing:
                      http://www.badcaps.net/forum/showthr...999#post300999

                      Inverter testing using old CFL:
                      http://www.badcaps.net/forum/showthr...er+testing+cfl

                      Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                      http://s807.photobucket.com/user/budm/library/

                      TV Factory reset codes listing:
                      http://www.badcaps.net/forum/showthread.php?t=24809

                      Comment

                      Related Topics

                      Collapse

                      • dj8452000
                        How To Test a P-channel Trench Mosfet Using A Multimeter In Diode Mode
                        by dj8452000
                        I am new to electronics and I'm understanding most of what I'm reading but I have a mosfet on my board that I've identified as a P-channel Trench Mosfet. I haven't a clue how to test this and what I should expect to see with the multimeter probes. I am hoping someone with years more experience than myself can help me understand how to use a multimeter to read this. Please look at the drawing I have attached to this and can you try to explain to me what I should be doing with my multimeter in diode mode and what results I should expect from a good mosfet?...
                        02-18-2025, 08:28 AM
                      • tmaster21
                        Ideapad 100 NM-A841, P channel mosfet on laptop in.
                        by tmaster21
                        Hello guys. i'm having problems here with this lenovo 110 with board NM-A841 laptop. There is an P channel(pq302) and after it i start ,i have 19v but with time, it decreases or if i press "power on" switch or jumper j6 , it falls to 0 and back to 19v. There is no short and works good on battery, but won't charge or charge until the voltage drop like i explain after P mosfet.
                        Well i suspect that this mosfet is no good. if you look to skematic i have steady 19v on P2 but start to decrease on P3 like if the mosfet is dying . the gate of boot N an P mosfet are the same: is steady...
                        07-17-2023, 09:48 AM
                      • Shuasmith14
                        330S-15IKB Components to replace along with shorted power MOSFET
                        by Shuasmith14
                        Hello. I'm currently working on a Lenovo Ideapad 330S-15IKB that has no power, no power light, dead. I found the schematics and I'm seeing proper voltage at the drain of the first DC IN MOSFET and nothing after. After doing some research and finding the power supply troubleshooting guide in this forum. I tested the second DC IN MOSFET and it's shorted from drain to source. My main question is since I'm new to doing this, I thought I heard somewhere that any time a MOSFET goes, you're supposed to replace the controller as well. That may not be right but I want to check if there's anything else...
                        08-22-2021, 06:16 AM
                      • vjsmoreira
                        Identifiing mosfet component - Replace with?
                        by vjsmoreira
                        Hi all,

                        Hope, this is the right place to ask.
                        I'm trying to repair a battery charger and the mosfet in the picture is shorted.
                        Can't find a datasheet, but it seems I can replace it with MJE13003.

                        Thanks in advance,

                        Vitor Moreira
                        10-27-2024, 01:27 PM
                      • Tarot Superstars
                        Reading N-Channel Mosfet Junctions (1N65)
                        by Tarot Superstars
                        Hi.
                        I have a Mosfet in a power adaptor circuit and I want to know what is the Gate, Drain and Source.
                        I have a data sheet and it shows which is the gate (#1) and I assume 2 and 3 are Drain and Source.

                        But when I read it with a multimeter I read that it's likely not that.
                        It seems to show that wire 3 is the gate and the other two are drain and source.
                        I want to know because I want to design tests on the mosfet to see if it is broken.


                        However, the gate of U1 (the pulse width modulator) is connected to wire 1 indicating it IS the gate...
                        09-27-2023, 01:46 PM
                      • Loading...
                      • No more items.
                      Working...