Datasheet

www.ti.com
Loop Compensation
2
1
1 2
2 2
OUT (max) OUT SENSE
IN _ RMS FQ
I V R K
M M
V Kh
=
1
FQ
SW ( typ )
K
f
=
1
15 385
65
FQ
K . s
kHz
m= =
1
7K =
2
1 2
2 2
0 9 390 0 067 7
0 372
0 92 115 15 385
. A V . V
M M .
. V . s sm m
´ ´ W´
= =
´ ´
VCOMP - V
0
0.4
0.8
1.2
1.6
2.0
M
1
M
2
M
1
M
2
vs
VCOMP
0.2
0.6
1.0
1.4
1.8
0 1 2 5 73 4 6
UCC28019
SLUS755B – APRIL 2007 – REVISED DECEMBER 2007
The selection of compensation components, for both the current loop and the voltage loop, is made easier by
using the UCC28019 Design Calculator spreadsheet that can be found in the Tools section of the UCC28019
product folder on the Texas Instruments website. The current loop is compensated first by determining the
product of the internal loop variables, M
1
M
2
, using the internal controller constants K
1
and K
FQ
:
The VCOMP operating point is found on Figure 29 . The Design Calculator spreadsheet enables the user to
iteratively select the appropriate VCOMP value.
Figure 29. M
1
M
2
vs. VCOMP
For the given M
1
M
2
of 0.372 V/ µ s, the VCOMP, approximately equal to 4, as shown in Figure 29 .
Copyright © 2007, Texas Instruments Incorporated Submit Documentation Feedback 33
Product Folder Link(s): UCC28019