jstamour802
Junior Member level 1
I need a scale-able high-current (5A) source at 48V supply voltage. I'm looking at this circuit from Linear Tech and it looks like a good starting place. Being able to scale the current by adjusting one resistor, and having the ground connected load, etc..
http://cds.linear.com/docs/en/application-note/an105fa.pdf
Constrains:
- current source must be scale-able, 100mA to 5A (or potentially more!)
- VCC can swing from ~1.5VDC to 48VDC, depending on the load
- Load is always grounded
My questions are:
- with some changes to component values and opamp/fet choice, is it realistic to scale this circuit to up to 5A?
- with a 48V VCC, is it correct in assuming I would need a rail-to-rail opamp capable of handling 48V supply?
- are there any other potential problems I'm not seeing?
Thanks in advance!
http://cds.linear.com/docs/en/application-note/an105fa.pdf
Constrains:
- current source must be scale-able, 100mA to 5A (or potentially more!)
- VCC can swing from ~1.5VDC to 48VDC, depending on the load
- Load is always grounded
My questions are:
- with some changes to component values and opamp/fet choice, is it realistic to scale this circuit to up to 5A?
- with a 48V VCC, is it correct in assuming I would need a rail-to-rail opamp capable of handling 48V supply?
- are there any other potential problems I'm not seeing?
Thanks in advance!