Help With Traco Power (DC-DC Convertor) Remote on/off

Discussion in 'The Projects Forum' started by stevy123, Jun 19, 2008.

  1. stevy123

    Thread Starter Active Member

    Nov 19, 2007
    61
    0
    Hi All

    I am using the traco power ten 40 - 2412 in a project and want to use the remote on/off facility in conjunction with a thermal fuse.

    The traco power i am using is: -
    http://uk.farnell.com/1242626/elect...?sku=tracopower-ten-40-2412&_requestid=308522

    The data sheet for it as is: -
    http://www.farnell.com/datasheets/112801.pdf

    To enable the thermal fuse to work i need it to pull the pin 3 of the traco power to ground if the fuse trips, but to give an open circuit or supply 3.5-12 volts while in operation.

    I had though that maybe a transistor could be used in conjunction with the thermal fuse, but unsure on how to do this. Anyone give me an idea of how to do this and make the remote on/off work?

    also the thermal fuse i want to use is this one.
    http://uk.farnell.com/476560/electr...s0?sku=thermodisc-g4a01072c&_requestid=309969

    Any help greatly appriciated.

    Cheers
     
  2. bertus

    Administrator

    Apr 5, 2008
    15,647
    2,346
    Hello,

    A transistor can be used to control the TRACO.
    I have made a proposal schematic.
    A 5 Volt signal will trigger the transistor to shutdown the TRACO.

    Greetings,
    Bertus
     
  3. stevy123

    Thread Starter Active Member

    Nov 19, 2007
    61
    0
    Hi Bertus,

    Thanks for your reply, can you talk me through what each part is doing, i take it i would attatch my themal fuse before the 10K resistor?

    Regards
    Stephen
     
  4. bertus

    Administrator

    Apr 5, 2008
    15,647
    2,346
    Hello,

    The TRACO DC-DC converters are normaly used to create an isolated voltage from the input voltage.
    My schematic has the following parts.
    The resistor (4K7) from pin 1 to pin 3 , this resistor is pulling pin 3 "high".
    The zenerdiode from pin 3 to pin 2 , reduces the voltage on pin 3 to 5.6 Volts. (3 to 12 Volts are needed).
    The transistor is pulling pin 3 to ca. 0.6 Volts, when a voltage of ca. 5 Volts is applied to the 10 K resistor that is placed in series with the base of the transistor.

    Greetings,
    Bertus
     
  5. stevy123

    Thread Starter Active Member

    Nov 19, 2007
    61
    0
    quote - The transistor is pulling pin 3 to ca. 0.6 Volts, when a voltage of ca. 5 Volts is applied to the 10 K resistor that is placed in series with the base of the transistor.

    What do you mean by ca? So if i put my fuse in before the 10K resistor it should work as required? then when the fuse trips the 0.6 volts is not present on the transistor and creates a short circuit? Am i right?

    Sorry for askin all these questions.

    Cheers
    stephen
     
  6. bertus

    Administrator

    Apr 5, 2008
    15,647
    2,346
    Hello,

    Can you make a drawing about how you want to connect the fuse?

    Greetings,
    Bertus
     
  7. stevy123

    Thread Starter Active Member

    Nov 19, 2007
    61
    0
    Hi

    I want to connect the fuse from a 12 volt source, when it goes over 72 degress it trips and switches the traco off. Unsure on how to connect it. Can you sujest a way?

    Cheers
     
  8. bertus

    Administrator

    Apr 5, 2008
    15,647
    2,346
    Hello,

    I have made a little addition to the circuit.
    When the traco is turned off it will not start by its own.

    Greetings,
    Bertus
     
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