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DRV8251AEVM: DRV8251A

ming liu
Prodigy 10 points
Part Number: DRV8251AEVM

Tool/software:

As dispicted in DRV8251AEVM user guide, Pot1 controls the PWM signal that goes into IN1, by turning it clockwise you increase the duty cycle from 0% to 100%. But when I use this evaluation board to drive a motor or coil, I can't get a PWM output, which duty cycle is from 10% to 100%,  from OUT1 test point. The PWM duty cycle is only from 0% to 47% when I turn the Pot1 Potentiometer clockwise. How can I get a 100% duty cycle PWM output?

In the period of test, the Pot2 is always 0% (no turning) and Pot3 is turn to 100% clockwise. The supply voltage is 24V.

  • 0
    TI__Mastermind 23421 points

    Hey Ming,

    I will have to look for an EVM in the lab tomorrow.  I would have thought some combination of IN1 and IN2 would be able to get OUT1 to 100%.

    If nothing else, you can remove the 0Ω resistor for IN1 or IN2 (R3 and R2 respectively) and jump in your own PWM signal on those pins from another microcontroller.  This will disconnect those pins from our onboard microcontroller.

    Best,

    Jacob