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  1. #1
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    Question Maximum Voltage with Chinese TB6560

    I see several topics about Chinese board TB6560.

    But still not clear to me that occurs with top voltage (36V)

    1.- 36VDC exactly happens?

    2.- Then what is the maximum voltage to work fine?

    3.- If the maximun voltage to 7812 and 7805 is 35V,
    THEN exactly 35VDC is the maximum voltage to work fine???
    ELSE 34.9V es the maximum voltage to work fine???

    4.- In your experience what voltage you apply?

    I appreciate any related information.

  2. #2
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    24V is usually the upper limit for most of these TB based boards. What does the board silkscreen or manual say?

    cheers,
    Ian
    It's rumoured that everytime someone buys a TB6560 based board, an engineer cries!

  3. #3
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    Question

    Quote Originally Posted by aarggh View Post
    24V is usually the upper limit for most of these TB based boards. What does the board silkscreen or manual say?

    cheers,
    Ian
    Just to clarify
    The TB6560 you say you do not know, is this.

    ... and say 36V.


    I appreciate your time and attention.

  4. #4
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    polygim plg25 sram backup

    Dear Friend,
    I need sram backup forpolygim make cnc lathe having model PLG25.
    The controller is fanuc oi TB mate.
    Machine data is lost and back up not available.Please support us back up.
    Regards
    sunil

  5. #5
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    Thumbs up

    Quote Originally Posted by ahpatel View Post
    Dear Friend,
    I need sram backup forpolygim make cnc lathe having model PLG25.
    The controller is fanuc oi TB mate.
    Machine data is lost and back up not available.Please support us back up.
    Regards
    sunil
    Search "FANUC" on the www.ebay.com

  6. #6
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    Technically the IC's should handle up to 36-40v, but you need to take the watts rating into account as well when determining the voltage to run them at. If the 36-40v input is going straight to 7812/7805's, this is way too high. Even if the regulators are rated for 35v max, this is not a continuous rating, and will damage them long term. At the least they will get amazingly hot.

    As I mentioned before, even though the IC's are rated 36-40v, almost all the implimentations i've seen sold are only supplied with a 24v supply, no doubt to keep well under limits due to lack of quality design?

    This thread may hold some interest on this topic:

    eBay TB6560 Stepper Motor Driver Boards - MYCNCUK

    cheers,
    Ian
    It's rumoured that everytime someone buys a TB6560 based board, an engineer cries!

  7. #7
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    Question

    Quote Originally Posted by aarggh View Post
    Technically the IC's should handle up to 36-40v, but you need to take the watts rating into account as well when determining the voltage to run them at. If the 36-40v input is going straight to 7812/7805's, this is way too high. Even if the regulators are rated for 35v max, this is not a continuous rating, and will damage them long term. At the least they will get amazingly hot.

    As I mentioned before, even though the IC's are rated 36-40v, almost all the implimentations i've seen sold are only supplied with a 24v supply, no doubt to keep well under limits due to lack of quality design?

    This thread may hold some interest on this topic:

    eBay TB6560 Stepper Motor Driver Boards - MYCNCUK

    cheers,
    Ian
    españolingléscriollo haitianoAlpha
    When I read that ic 40VDC, 3amp. So the idea I have is to be able to work with engine power up to 120 watts. I suspect that it is not reality.

    My question now is: What is the maximum power of TB6560?

    Reading encounter: "Power dissipation AHQ = 43 W."

    Power dissipation is equal to power drive?

    Trying to clarify these questions read:

    Power Dissipation
    The power dissipation of the IC can be Calculated by the Following equation:

    P = VDD × IDD + IOUT × IOUT × Ron × 2 phases

    Now my doubts are multiplied exponentially. LOL

    That means, that is Output ON-resistance?

    I need an example to correctly interpret that formula Power dissipation.

    I appreciate any related information.

  8. #8
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    My interpretation of the dissipation spec is the maximum rated power consumed by the TB6560, and not the maximum power applied to the stepper motor load.

    Also note that the allowable power dissipation will depend on the quality of the heat sink that is used.

    Ron would seem to be the resistance of the output driver transistor when it is conducting full current. My understanding of the TB6560 is that it uses PWM to drive the motors and limit current, and so the output stage will chop (switch) the current to the load. So any calculation of power applied to the load would represent an instantaneous, peak value.

  9. #9
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    The chips can take up to the rated voltage, but keep in mind that the motors act as a generator when they are being decelerated. The generated voltage adds to the power supply, and is difficult to predict. So to be safe, you need to keep the power voltage well below the limit. I think 24-30v should be ok.

    The board is poorly designed. Although higher voltage will give better performance, lower voltage will reduce the chance of it self destructing for mysterious reasons.

  10. #10
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    Quote Originally Posted by doorknob View Post
    My interpretation of the dissipation spec is the maximum rated power consumed by the TB6560, and not the maximum power applied to the stepper motor load.

    Also note that the allowable power dissipation will depend on the quality of the heat sink that is used.

    Ron would seem to be the resistance of the output driver transistor when it is conducting full current. My understanding of the TB6560 is that it uses PWM to drive the motors and limit current, and so the output stage will chop (switch) the current to the load. So any calculation of power applied to the load would represent an instantaneous, peak value.
    The datasheet is not everything.

    I found TB6560AHQ File Usage Considerations.

    Motor power voltage (Operating range)
    4.5 V to 34.0 V


    I found the file Reliability Information.
    Reliability Information report 0 Failure of 32 test.

    So I question myself:

    Someone had problems within that range of voltage?
    (4.5 to 34)
    Attached Files Attached Files

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