Drive for PWM controlled solenoid valve

[John Ely]

Hello,

What is the best way to control a solenoi valve using PWM? I'm
considering the TI DRV-102, but there doesn't seem to be a lot of
applications data for using it.

I would like the capability of dithering the PWM to reduce stiction in
the valve.

Any suggestions?

Thanks.

John

 

[S.M.Taylor]

Hello,

What is the best way to control a solenoi valve using PWM? I'm
considering the TI DRV-102, but there doesn't seem to be a lot of
applications data for using it.

I have used it - its a nice part. What kind of apps data do you need ?
The data sheet I had seemed quite extensive.

Steve

 

[John Ely]

I have used it - its a nice part. What kind of apps data do you need ?

I am using it to control a solenoid used to vary hydraulic fluid flow.

The data sheet shows it can be controlled by a D/A converter, but
there are no sample circuits. I would like to keep things fairly
cheap and simple. I only need to control about 200 uA of current from
the DRV-102.

It seems the part was made with the idea of (mostly) controlling
relays.

Regards,

John

 

[S.M.Taylor]

I am using it to control a solenoid used to vary hydraulic fluid flow.

The data sheet shows it can be controlled by a D/A converter, but
there are no sample circuits. I would like to keep things fairly
cheap and simple. I only need to control about 200 uA of current from
the DRV-102.

It seems the part was made with the idea of (mostly) controlling
relays.

I've just used it to make a switchmode closed loop motor driver - the
duty cycle is easily controlled by a current sink attached to pin 3 of
the thing.

You don't get 100% drive though, ever. The 10-90% is all.
Steve

 

[John Ely]

I've just used it to make a switchmode closed loop motor driver - the
duty cycle is easily controlled by a current sink attached to pin 3 of
the thing.

What sort of current sink did you use? I'm curious about compliance
to ground and how it is controlled.

It seems to me that if I use the DRV-102 I need two current sinks, one
dithered on and of at, perhaps 500 Hz, to reduce valve stiction and
one to control the (mean) valve position.

Regards,

John