Datasheet

L1
22uH
L2
22uH
C
CUK
1uF
C
IN
10uF
C
OUT
22uF
C
FF1
1000pF
R
FB1
29.4k
R
FB2
1k
D
LM2611A
V
IN
5
SW
1
NFB
3
SHDN
4
GND
2
V
OUT
-5V
C
IN
: TAIYO YUDEN X5R JMK325BJ106MN
C
CUK
: TAIYO YUDEN X5R TMK316BJ105ML
C
OUT
: TAIYO YUDEN X5R JMK325BJ226MM
D: ON SEMICONDUCTOR MBR0520
L1, L2: SUMIDA CDRH6D28-220
C
FF2
1uF
R
FB3
9k
2.7V
V
IN
d
14V
d
LM2611
SNOS965I –JUNE 2001–REVISED APRIL 2013 www.ti.com
High Duty Cycle/Load Current Operation
The circuit in Figure 32 is used for high duty cycles (D > 0.5) and high load currents. The duty cycle will begin to
increase beyond 50% as the input voltage drops below the absolute magnitude of the output voltage. R
FB3
and
C
FF2
are added to the feedback network to introduce a low frequency lag compensation (pole-zero pair)
necessary to stabilize the circuit under the combination of high duty cycle and high load currents.
Figure 32. LM2611 High Current Schematic
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