LT3741 parallel operation

You can parallel two LT3741-1s as the image below of a datasheet Typical Applications circuit shows.  The regulators don's share current equally except at maximum IOUT.

ARad said:

The regulators don's share current equally except at maximum IOUT.

Al right, in this example maximum IOUT is 10A and in this case each controller delivers 5A to the load. But if the current load is for example 8A? How would the current be distributed? What will it depend on?

regards,
gaston

It is somewhat random, but the LT3741-1 with the higher FB threshold will initially provide all the power.  When the LT3741-1 with the higher FB threshold starts to current limit, the output voltage will drop enough for the second LT3741-1 to start providing power.  In your 8A IOUT scenario, one of the LT3741-1s will provide 5A and the second will provide 3A.   It is possible that the FB thresholds could be matched well enough that the LT3741-1s will share output current, but the scenario I describe above will definitely be possible as well and probably more likely. 

It may sounds extreme. I'm looking for the solution to drive laser diodes with up to 100A current (less than 20V with the duty cycle less than 20%). If I set the Rsense to be 2mOhm and put 5 chips in parrellel, it should work in principle, am I right? Does the pin SYNC help to coordinate 5 chips to work simutaneously?

Thanks.

Lion

It may sounds extreme. I'm looking for the solution to drive laser diodes with up to 100A current (less than 20V with the duty cycle less than 20%). If I set the Rsense to be 2mOhm and put 5 chips in parrellel, it should work in principle, am I right? Does the pin SYNC help to coordinate 5 chips to work simutaneously?

Thanks.

Lion