Hello,
I am using the LTC2662 as a current source to drive a proportional solenoid valve, and here are a few questions I have.
The coil resistance is 500 ohm, and the driving current is 10mA at full opening.
I need to control the current direction in the coil, so is it a good idea to wire the load between OUT0 and OUT1 and use one output in "switch-to-V- mode", while V- is attached to ground ?
In this way, to make the current flow in one direction, OUT1 is in “switch to V-” mode and OUT0 is the current source. And for the opposite direction, OUT0 is in “switch to V-” mode and OUT1 is the current source. See the schematic attached.
Also, for convenience, I would like to use the LTC2672 with VDDx wired to a 5V supply. Unfortunately, that a bit too low to drive the 500ohm load at 10mA even with the low dropout output of this chip.
Is there any circuit that I could add between DAC and load, such as a unity gain current amplifier with low input impedance and high load driving capability ?
Thank you in advance for your help !
Regards
