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microstepping using NJM3771 and NJU39610

hello sir
i m working on stepper motor and my project is basically microstepping of stepper motor using NJM3771(driver)+NJU39610(DAC).the pulses are coming on pin 1,4,19,22 of the driver but when motor is connected the pulses disappear and motor is not taking any current.so what may be the fault?
thanks.

  • Hello,
    I'm using a similar combination (NJM3772) without problems. At first you should carefully read the datasheets of both ICs. There are sample circuits a lot of hints.
    Check the supply voltages +5V and +10..45V.
    Then check the output of the DAC (the two analog voltages and the phase).
    You can measure the output currents at the current sensing resistors.

    Good luck!