Datasheet

F1C
SS
P
=
SS
C
=
nF975
( )
10.5 ms30 ms-
=
( )
BASESSSUTSU
tt
--
-
k20 :
=
k20 :
ms5.10t
BASESSSU
=

CCk28C168
OCMPBYP
x
+
x:
+
x:
=
BASESSSU
t
--
I
LED
V
O
F40
F33.0k28F2.2168t
BASESSSU
Px
+
Px:
+
Px:
=

V21
A1
ms1.13t
SU
=
CCk36C168
OCMPBYP
x
+
x:
+
x:
=
SU
t
I
LED
V
O
F40
F33.0k36F2.2168t
SU
Px
+
Px:
+
Px:
=
V21
A1
LM3424
www.ti.com SNVS603B –AUGUST 2009–REVISED OCTOBER 2009
15. SOFT-START
Solve for t
SU
:
(159)
If t
SU
is less than t
TSU
, solve for t
SU-SS-BASE
:
(160)
Solve for C
SS
:
(161)
The chosen component from step 15 is:
(162)
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