Need 0-5VDC at 300 milliamps to control a valve

[NI-hilator]

This is not really a software question as it is a hardware selection question. I need a serial/USB controlled analog out, 0-5VDC at 300 mA or greater to control a valve.  Can anyone suggest a serial/USB A-D and/or amplifier/driver to get the needed 300 mA per channel?

Thanks

[Kyle_A.]

Hi Tim,

The closest product I could find that will achieve what you are looking for is a USB-6525 Solid State Relay DIO device, which can meet the specifications you have outlined.  You will have to provide externally the current that is being sourced, but the relays can handle the switching on and off for control.

[NI-hilator]

Hi Kyle,

I guess I wasn't specific enough.  I need a D to A so I can proportionally control the valve.  The module you specified is only on/off correct?

Tim

[Henrik_Volkers]

How about using a buffer with external power (or an extra USB port) like the LMH6321 (300mA)

This device works with 5V single supply, NS also offer an evaluation board and free samples 🙂

Or look for audio amps ( I assume you don't want to drive the valve in the MHz range 😉 )

Another approach is a PWM drive, the BS170 FET can drive 500mA