You haven't given the reason for requiring isolation, ?
What would it be?
A small opto isolator would provide it.
e.g. 4n35, PC817

One fix.

View attachment 292006

If you went with your first solution (4n35) couldn't it drive the solenoid directly with no 2N7000?

 

If you went with your first solution (4n35) couldn't it drive the solenoid directly with no 2N7000?

Might be worth a shot.

 

If you went with your first solution (4n35) couldn't it drive the solenoid directly with no 2N7000?

It might but it seems from my understanding of the data it would require more LED current then the 18 ma collector current required.
Would not be efficient?

 

It might but it seems from my understanding of the data it would require more LED current then the 18 ma collector current required.
Would not be efficient?

I am not sure but I think you are correct. 50mA to turn it on? That doesn't seem right, but that's what the datasheet seems to say.

Yeah, so maybe not the 4n35, but I'm sure there is an opto that can drive the solenoid directly.

 

Where does the 50ma come from? How is that possible with a DC coil?
Don't see anything in the data sheet ? According to the wattage quoted.

 

could you tell me a way so that i could make this work
or is it possible to drive using switching from ho to lo using input signals

I think this should work but not tested.

 

OP seems to insist he needs Isolation??

 

I know what he said but he also seems to be in a rush and probably can make do with parts on hand.

 

Where does the 50ma come from? How is that possible with a DC coil?
Don't see anything in the data sheet ? According to the wattage quoted.

Well initially this is the number I was talking about:

But I overlooked that it is the ABSOLUTE MAXIMUM forward current. I do not see anywhere that the datasheet says the minimum required current to switch the output. But in other places, test conditions state 10mA forward current,



so maybe that implies a good value?

But then there's this:


Which, if I'm reading that correctly, does seem to indicate you would need 30-50mA through the LED in order to pass 18mA through the other side.

 

miss-understood what you where referring to, didn't realize it was the input LED diode.
Thought you were referring to the output/solenoid current.

 

One fix.

View attachment 292006

my 5/2 solenoid has 2 solenoids in it so i need to send inverted inputs to the other solenoid
so basically its one solenoid on other is off
other is on another is off

 

Maybe like this: When the input is high S2 is activated, S1 when the input is low.

 

OP seems to insist he needs Isolation??

The 2111 high side driver is isolated from the logic and low side. Check the block diagram in the data sheet.

You could power the logic with one supply and use a second isolated supply with ground at Vs 24V to Vb and output at Ho.

 

One fix.

View attachment 292006

my 5/2 solenoid has 2 solenoids in it so i need to send inverted inputs to the other solenoid
so basically its one solenoid on other is off
other is on another is off

 

m

my 5/2 solenoid has 2 solenoids in it so i need to send inverted inputs to the other solenoid
so basically its one solenoid on other is off
other is on another is off

my bad sorry sent it by mistake

 

I think this should work but not tested.
View attachment 292029

I doubt it, i
the IR2111 has a UVLO on the boosted supply, between pins 8 and 6.

 

my 5/2 solenoid has 2 solenoids in it so i need to send inverted inputs to the other solenoid
so basically its one solenoid on other is off

This works on the breadboard. When the input is low S1 is ON and S2 is OFF, vice versa when the input is high.

 

i need isolation in my circuit

What type of isolation?

None of the proposed circuits, other than the opto isolator and the solid-state relay have galvanic isolation.

Wouldn't that circuit place 24 volts on the gate when activated?

Yes.
Just add another 10kΩ resistor from the MOSFET gate to ground, which will halve the gate voltage to 12V.

 

mosfet would need isolation
could you tell me a way so that i could make this work
or is it possibile to drive using switching from ho to lo using input signals

None of the proposed circuits, other than the opto isolator and the solid-state relay have galvanic isolation.

This should complete the requirements.