Datasheet

Current Sense
I/V Gain
V.V
ref
80=
o
V
L
i
ESR
R
1
R
2
R
c
R
o
C
c
C
Roll
C
ff
C
L
R
ug
M
130=
COMPx
FBx
Gm=10A /V
TPS65251
www.ti.com SLVSAA4D –JUNE 2010–REVISED DECEMBER 2012
Loop Compensation
TPS65251 is a current mode control dc/dc converter. The error amplifier is a transconductance amplifier with a of
130 µA/V.
A typical compensation circuit could be type II (R
c
and C
c
) to have a phase margin between 60 and 90 degrees,
or type III (R
c
, C
c
and C
ff
) to improve the converter transient response. C
Roll
adds a high frequency pole to
attenuate high-frequency noise when needed. . It may also prevent noise coupling from other rails if there is
possibility of cross coupling in between rails when layout is very compact.
Figure 23. Loop Compensation
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