Other Parts Discussed in Thread: TINA-TI,
Tool/software: TINA-TI or Spice Models
Hi team,
The customer use OPA551 to build up a current source whose current can be changed by changing the voltage of the V+. See the simulation in TINA.
And the simulation in TINA shows when the schematic is correct.
But when I test the current output in the circuit without connecting the load, the current range is (-60mA 20mA).
After I connect the load, the current range becomes (-41.68mA 41.68mA) which is the same as the simulation.
Could you explain the cause?
There is about 0.3V gap between the positive and negative input of the amplifier and the temperature of the amplifier is high.
Does it make sense?
Thanks a lot!
Lacey