UCC39002: Average Current Control Load Sharing

Hello Francis, 

Your customer is misunderstanding how the UCC39002 load-share (LS) controller works. 

It does not modify or adjust the PWM controller peak current or average current.  The LS controller uses ADJ current (limited to up to 6mA max) to adjust the voltage feedback to the power supply control.   The PSU control does not even have to be PWM; it can be a linear regulator.  

Please refer to the 2 App-Notes recommended in my recent reply to another customer to help understand how the UCC39002 LS controller works: 

https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1470110/ucc39002-the-principle-of-control-mode/5643990#5643990 

Regards,
Ulrich

Hi Francis, 

Yes, the UCC39002 controller operates exactly leader/follower (formerly "master/slave") control, except that any one of the "N" LS controllers may assume being the leader  at any time depending on system dynamic and static conditions.   The remaining N-1 controllers become followers. 

That situation can change at any time. The PSU with the highest output current always becomes the leader.  

Regards,
Ulrich