Datasheet

1
+
+
¸
¹
·
¨
©
§
R
R
L1
¸
¸
¹
·
¨
¨
©
§
D
2
D
2
'
¨
©
§
R
R
ON
¸
¹
·
¸
¸
¹
·
¨
¨
©
§
D
D
2
'
1+
+
¸
¸
¹
·
R
R
L2
V
D
V
OUT
¨
¨
©
§
¸
¸
¹
·
¨
¨
©
§
D
=
V
OUT
V
IN
D
'
¨
¨
¨
¨
¨
¨
©
§
¸
¸
¸
¸
¸
¸
¹
·
+
+
-
-
sw
i
i
)t(
1L
1L
R
v
L1
( )
t
IN
V
2L
R
i
)t(
2L
i
)t(
1D
+
-
v
C1
( )
t
v
D1
( )
t
v
L2
( )
t
on
R
i
)t(
2C
+
-
v
C2
( )
t
+
-
v
O
( )
t
i
)t(
1C
V
O
V
IN
L
1
D
1
C
1
C
2
R
1
R
2
L
2
1
2
3
6
5
4
LM3410
C
3
HB/OLED
LM3410, LM3410Q
www.ti.com SNVS541G –OCTOBER 2007–REVISED MAY 2013
Figure 26. HB/OLED SEPIC CONVERTER Schematic
Steady State Analysis with Loss Elements
Figure 27. SEPIC Simplified Schematic
Using inductor volt-second balance and capacitor charge balance, the following equations are derived:
I
L2
= (I
LED
) (63)
and
I
L1
= (I
LED
) x (D/D') (64)
(65)
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