#### treez

##### Advanced Member level 5

I wish to make a 6.5mA current source with LM234.

The ratio of I(bias) to I(set) isn't quoted in the datasheet for any more than 5mA, therefore, i must use two pieces of LM234 and parallel them. (3.25mA each)

This means using a resistor of 21.2 Ohms in each LM234 circuit.

1....Is it ok to parallel LM234's

2...The datasheet page 3 quotes the ratio of I(set) to I(bias) as 14 for Iset= 1mA to 5mA, ...However, the graph on page 5 of the datasheet clearly shows that this ratio varies widely over the range 1mA to 5mA.....so how come they have quoted a fixed figure of "14" on page 3 of the datasheet?

3.....Why does the datasheet indicate that LM234 can supply 10mA?....after all the ratio of I(bias) to I(set) isnt stated for any more than 5mA....so surely 5mA is the realistic maximum for LM234?

LM234 DATASHEET:

http://www.ti.com/lit/ds/symlink/lm234.pdf