Datasheet

LED5000 Application notes - alternative topologies
Doc ID 023951 Rev 1 45/51
Equation 78
6.4.1 f
p
< BW
In case the pole f
p
is inside the system bandwidth BW, the component values composing the
compensation network can be calculated as:
Equation 79
and
Table 10. BB and boost parameters
Boost Buck-boost
K
D
K
m
k
f
p
ω
p
2 π⋅
-------------
1
2 π⋅
-------------
K
D
C
O
R
LOAD
⋅
---------------------------------
⋅==
1
R
LOAD
V
OUT
I
LED
-----------------
--------------------- -
R
LOAD
1D–()
2
⋅
R
CS
---------------------------------------------------
1
K
m
-------- -
K
1D–()
------------------+
⎝⎠
⎜⎟
⎛⎞
⋅++
1
R
LOAD
D⋅
V
OUT
I
LED
-----------------
-------------------------------------
R
LOAD
1D–()
2
⋅
R
CS
---------------------------------------------------
1
K
m
-------- -
K
1D–()
------------------+
⎝⎠
⎜⎟
⎛⎞
⋅++
1
0.5 D–()R
CS
T
SW
L
-------------
V
OUT
V
IN
–
V
OUT
--------------------------------- -
R
CS
T
SW
L
-------------
⋅⋅+⋅⋅
--------------------------------------------------------------------------------------------------------------------------------------------------
1
0.5 D–()R
CS
T
SW
L
-------------
V
OUT
V
IN
V
+
OUT
----------------------------------- -
R
CS
T
SW
L
-------------
⋅⋅+⋅⋅
---------------------------------------------------------------------------------------------------------------------------------------------------- -
0.5 R
CS
T
SW
L
-------------
D1D–()⋅⋅⋅⋅
0.5 R
CS
T
SW
L
-------------
D1D–()⋅⋅ ⋅⋅
R
C
R
EA
A
0
----------
BW
f
p
---------
⋅=