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DRV102!

Former Member

regarding the duty cycle of TO220 How to adjust the duty cycle continuously for example from 20% to 50% to 90% and so on at one operation?

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  • 0

    I have looked over the data sheet that you linked and if you refer to Table II and Figure 4 they give you the values of the resistor that needs to be connected between the Adjust Pin and ground in order to get a specific duty cycle. You turn the chip on and off by making the input pin High (ON) or Low (OFF). You could install a variable resistor on the adjust pin with a value in the range outlined by the data sheet and then you could adjust your duty cycle much as you would turn up a volume control on a radio.

    John

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  • 0

    I have looked over the data sheet that you linked and if you refer to Table II and Figure 4 they give you the values of the resistor that needs to be connected between the Adjust Pin and ground in order to get a specific duty cycle. You turn the chip on and off by making the input pin High (ON) or Low (OFF). You could install a variable resistor on the adjust pin with a value in the range outlined by the data sheet and then you could adjust your duty cycle much as you would turn up a volume control on a radio.

    John

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  • 0 in reply to jw0752

    thanks a lot

    but what about if program an arduino to get the listed voltage instead of the variable resistor then i use DAC to duty cycle pin, so i can achieve  what i want which is  the operation to work continuously without manual adjusting?

  • 0 in reply to Former Member

    This makes sense to me. What you are saying is that you would program the arduino to adjust its PWM output to control an DAC circuit which in turn would supply the desired voltage to the Adjust pin of your IC which would produce the desired power duty cycle to your solenoid. If you have a sensor, on the actuator, that can feed back to the arduino you will be able to regulate the travel of the actuator.

     

    Also Don is very correct in pointing out that if you do use a potentiometer for control of the adjust pin it would be good practice to tie down the loose end of the potentiometer to the wiper.