DRV102!

Hi,  The designation TO 220 is a case style of a transistor, SCR, or Triac. If properly heat sunk and not over driven the TO-220 case is easily capable of 100% duty cycle. You will have to give us more information on your circuit and application for more information.

John

first of all thanks for reply

actually i want to derive a solenoid valve to control the flow of air pressure .This air  pressure is connected to a cylinder which in turn used to pull up the suspension car model but controlled by the previous solenoid valve.so i want  by using the DRV102(TO220) to derive the solenoid valve and by adjusting the duty cycle which is allowable in DRV102 to see the the different height of the suspension car model increase or decrease proportional to duty cycle for example from %20 to %30 to %50 and so on.......

http://www.ti.com/lit/ds/sbvs009b/sbvs009b.pdf

Do you want to make this adjustment with a dial or a computer or something else?

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

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?

thanks for reply

i want to use micro controller for that?

John, you're a borderline claim-jumper!  How are things?  Thawed out yet?

When you degenerate a potentiometer into a variable resistor, the naive thing to do is connect the wiper end and use one leg of the resistor and float the other.  This leaves the unused end of the resistor to act as a little antenna, bollixing your precision.  If you tie what was going to be the free end of the resistor to the wiper, you can avoid this.

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?

This is a neat chip!  IDK how suited it is for uP control, though.  It seems like the thing to do would be to use the PWM on the uP to generate the (control voltage) CV.  Which seems a little Rube Goldberg.  For some reason many uP manufacturers include A/D but often leave us with some rather crude PWMs for analog out.  For a uP that had on-board D/A, this would be one nifty ticket!

In the sad case you are unacquainted with Rube Goldberg:

https://www.google.com/search?q=rube+goldberg&newwindow=1&client=firefox-a&hs=mld&rls=org.mozilla:en-US:official&channel…

Rube Goldberg : Home of the Official Rube Goldberg Machine Contests