Replacement for SMD ICs TND 501

Replies

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  dario

  Hi, I've got the same problem with ah500-7 head. 2SK3590 n-channel mosfets are shorted and when I tried to replace them, they blow up immediately. I suspect the cause is TND 501, but I can't get datasheet or find an alternative. I'm looking for schematic of the amp too, but until now nobody has it! Please if you solve this problem, help me!!!
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  Jeffrey Arulraj

  Can you post a little more like the current readings around the Mosfet?
  
  Is there any readings of voltage and some circuits that you tried out? If so pls post them as only then we can see and find the cause of failure
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  dario

  Since I found schematic, I've done some measures on circuit. The supply circuit is made in this way: 230Vac -> transformer -> rectifier -> filter caps (Vcaps 110Vdc) -> switching stabilization (half bridge configuration) with setpoint 85-90Vdc. The trouble is in the switching stabilization or in its analog control. I don't know the exact sequence of events that destroy this circuit. A simple solution is: bypass the switching stage, so Vcaps will supply directly the power amp ( a voltage ripple can be tolerated in my opinion ). Obviously mosfets and all part that supply driver have to be removed. This is the faster way since hb driver replacement can't be found!
  Thanks Jeffrey for your interest!
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  Jeffrey Arulraj

  That was great that you solved the issue I think the current input to the driver is beyond critical, But with out the circuit diagram I am helpless in checking that out
  
  But its a pleaure to hear that you have solved the issue on your own
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  Wiggyjnr

  Hello, I have the same issue with the TND-501 in a Trace Elliot 1215 500w combo. I've managed to fond a circuit diagram (attached as a .pdf). How exactly can I get around this problem without throwing the amplifier away? Jeffrey, your advice would be much appreciated here!
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  Wiggyjnr

  Hello again, is anybody able to help with this or should I give up and sell it for spares?
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  Radan Malbašić

  I could be wrong but I'll try TND501 replaced with IR2110S, I have nothing to lose, amplifier is certainly incorrect, and of course I will never buy a Trace Elliot amp.
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  Wiggyjnr

  Hi Radan
  
  How did you get on with the ir2110s?
  
  Did it work?
  
  Kind regards
  
  Dave