Re: Driving Hydraulic/Pneumatic solenoid valves
- --- In Electronics_101@yahoogroups.com, "Chuck Hackett" <egroupscdh@...> wrote:
>Perhaps look at something like the MCP1404? Takes a logic signal and drives a MOSFET. However, since it can source up to 4.5A you could probably use it on it's own.
> I need to drive several Hydraulic and Pneumatic solenoid valves. They vary
> between 12v and 24v DC with a current requirement of 1A to 2A.
> On/Off rates vary from 2 or 3 times a second to on for extended periods (say
> 30 seconds).
> They are controlled by an ATMega128 microcontroller.
> I know I can do it with a common parallel driver chip and relays but I'd
> prefer to do it with solid state devices (I'm assuming some kind of FET is
> appropriate here?).
> Can someone suggest a particular FET and drive circuit?
- Drivers, yes ok, or protected drivers. But is that not the device of choice for driving high power solenoids? Or do people use "bare" FETs or Transistors? Wasnt that the original poster's question.
--- In Electronics_101@yahoogroups.com, Jan Kok <jan.kok.5y@...> wrote:
> On Thu, Apr 25, 2013 at 12:29 AM, Michael <mmk_tsm@...> wrote:
> > Jan,
> > there are a whole range of devices out there with many protection
> > features built in - see below for NCV8402. I havent used anything myself
> > with current handling up to 2A. I have used 8 channel devices with
> > protection, i.e. ST's VN808's, for smaller solenoids, it is rated to 0.7A.
> > And is excellent - pity package is so ackward.
> Ah. I call those devices "drivers", because that's how they are listed on
> DigiKey and most manufacturers' websites.
> > NCV8402 is a two channel, three terminal protected Low-Side Smart Discrete
> > device. The protection features include overcurrent, overtemperature, ESD
> > and integrated Drain-to-Gate clamping for overvoltage protection. This
> > device offers protection and is suitable for harsh automotive environments.
> Nice chip. It should work fine in this application (2A solenoid driver)
> and would protect itself from short circuits in the load. A diode across
> the solenoid is still recommended, because of the 150 mJ max Single Pulse
> Avalanche Energy spec.
> [Non-text portions of this message have been removed]