Datasheet
Z
ZEA
=
1
C
COMP
x R
COMP
Z
O
=
1
(C
HF
+ C
COMP
) x R
FB2
Z
HF
=
C
HF
x C
COMP
x R
COMP
(C
HF
+ C
COMP
)
x
G
EA(S)
=
1 +
s
s
Z
ZEA
1 +
s
Z
O
Z
HF
K
FB
=
R
FB1
R
FB1
+ R
FB2
x
1
-G
EA(S)
x
=
V
COMP
1 +
+
1
A
OL
s
Z
BW
V
OUT(FB)
1 +
G
EA(S)
K
FB
LM5116
SNVS499G –FEBRUARY 2007–REVISED MARCH 2013
www.ti.com
For V
SL
without R
RAMP
, use I
OS
= 25 µA
For V
SL
with R
RAMP
to V
CC
, use I
OS
= 25 µA + V
CC
/R
RAMP
For V
SL
with R
RAMP
to -V
CC
, use I
OS
= 25 µA - V
CC
/R
RAMP
ERROR AMPLIFIER TRANSFER FUNCTION
The following equations are used to calculate the error amplifier transfer function:
(47)
(48)
(49)
Where A
OL
= 10,000 (80 dB) and ω
BW
= 2π x f
BW
. G
EA(S)
is the ideal error amplifier gain, which is modified at DC
and high frequency by the open loop gain of the amplifier and the feedback divider ratio.
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