Datasheet

LT6110
31
6110fa
For more information www.linear.com/LT6110
applicaTions inForMaTion
Figure 24a. Transient Response of Buck Regulator without
LT6110 Line Drop Compensation
Figure 24b. Transient Response Buck Regulator with an LT6110
in the Loop
produces a load transient that settles without overshoot or
ringing (a 10% C
COMP
tolerance is adequate). An optional
connection for C
COMP
is in parallel with R
FA
and R
FB
(from
V
REG
to V
FB
) to reduce the C
COMP
value for the smallest
capacitor size.
Figures 24a through 24c illustrate a typical loop opti
-
mization procedure when an LT6110 is included in the
regulator’s loop.
Figure 24a shows a load transient response of the LT3980
buck regulator with an optimum phase margin without
line drop compensation. The load transient settles without
overshoot.
Figure 24b shows a load transient response of the LT3980
buck regulator with LT6110 line drop compensated load
voltage. The load transient has an overshoot due to the
LT6110 decreasing the phase margin.
Figure 24c shows a load transient response of the LT3980
buck regulator with an LT6110 and with a C
COMP
capacitor
added to compensate for the LT6110 in the loop. The load
transient settles without overshoot as the phase margin
is restored.
Figure 24c. Capacitor C
COMP
Compensates for the LT6110 in the
Regulator’s Loop
200mV/DIV
200mV/DIV
200µs/DIV
6110 F24a
V
REG
V
LOAD
I
LOAD
1A
1.6A
200mV/DIV
200mV/DIV
200µs/DIV
6110 F24b
V
REG
V
LOAD
I
LOAD
1A
1.6A
200mV/DIV
200mV/DIV
200µs/DIV
6110 F24c
V
REG
V
LOAD
I
LOAD
1A
1.6A