Datasheet

SLUU166A - December 2003 − Revised February 2004
16
UCC39002 Advanced Load-Share Controller User’s Guide, HPA027A
12 Appendix
Example
NOTE:The following calculations are given as an example. Actual circuit values will vary depending
upon the specific modules used
This design uses the UCC39002 to parallel three Texas Instrument PT4484 modules whose output voltages are
nominally 5 V, the maximum output current of each module is 20 A, and a maximum output voltage adjustment
range of 2% of the output voltage.
Known Variables
N is equal to the number of paralleled units:
N + 3
V
OUT
is equal to the nominal output voltage of the modules:
V
OUT
+ 5V
I
OUT(max)
is equal to the maximum output current of each module:
I
OUT(max)
+ 20 A
∆V
OUTADJ(max)
is equal to the maximum output voltage adjustment range of the module by the Sense pins, which
is 2% of the output voltage for these modules:
DV
OUTADJ(max)
+ 0.02 V
OUT
DV
OUTADJ(max)
+ 0.1 V
Because the output voltage of the modules is equal to 5 V, the load share controller can be biased directly from
this output bus by shorting the JP1, JP2, and JP3 connectors to the INT. positions:
V
DD
+ 5V