How to design a current source (lm334)

[Johnny_YU]

HI ALL,
I wonder how to understand 0.02%/V CURRENT Regulation and +/-3% initial Accuracy in LM334 DATASHEET.

 

[crutschow]

.02%/V is the amount the constant current value changes with a change in output voltage due to a change in load resistance. It's a measurement of the "stiffness" deviation of the current source from the ideal.

±3% is the untrimmed accuracy of the load current from the ideal calculated value due to manufacturing tolerances of the LM334.