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LM3424 Datasheet(PDF) 45 Page - Texas Instruments

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Part # LM3424
Description  Constant Current N-Channel Controller with Thermal Foldback for Driving LEDs
PDF  69 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LM3424 Datasheet(HTML) 45 Page - Texas Instruments

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F
1
C
SS
2
=
SS
C
=
nF
975
(
)
10.5 ms
30 ms -
=
(
)
BASE
SS
SU
TSU t
t
-
-
-
k
20 :
=
k
20 :
ms
5
.
10
t
BASE
SS
SU
=


C
C
k
28
C
168
O
CMP
BYP
x
+
x
:
+
x
:
=
BASE
SS
SU
t
-
-
I
LED
V
O
F
40
F
33
.
0
k
28
F
2
.
2
168
t
BASE
SS
SU
P
x
+
P
x
:
+
P
x
:
=


V
21
A
1
ms
1
.
13
t
SU =
C
C
k
36
C
168
O
CMP
BYP
x
+
x
:
+
x
:
=
SU
t
I
LED
V
O
F
40
F
33
.
0
k
36
F
2
.
2
168
t
SU
P
x
+
P
x
:
+
P
x
:
=
V
21
A
1
ROV1 = 15.8 k:
ROV2 = 499 k:
=
V
OFF
TURN
=
-
R
OV1
k
8
.
15
:
V
OFF
TURN-
(
)
R
R
1.24V
OV2
OV1 +
x 0.5 x
(
)
k
499
k
8
.
15
1.24V
:
+
:
x 0.5 x
V
= 39.8
:
=
=
k
15.7
-
-
0.62V
V
OFF
TURN
x R
1.24V
OV2
=
R
OV1
:
x
k
499
1.24V
- 0.62V
40V
2
9.98V
A
20
k
499
A
20
R
V
OV
HYSO
=
x
:
=
x
=
P
P
LM3424, LM3424-Q1
www.ti.com
SNVS603C – AUGUST 2009 – REVISED AUGUST 2015
Typical Applications (continued)
(155)
Solve for ROV1:
(156)
The closest standard resistor is 15.8 k
Ω making VTURN-OFF:
(157)
The chosen components from step 14 are:
(158)
8.2.2.2.15
Soft-Start
Solve for tSU:
(159)
If tSU is less than tTSU, solve for tSU-SS-BASE:
(160)
Solve for CSS:
(161)
The chosen component from step 15 is:
(162)
Table 1. Bill of Materials
QTY
PART ID
PART VALUE
MANUFACTURER
PART NUMBER
1
LM3424
Boost controller
TI
LM3424MH
1
CBYP
2.2 µF X7R 10% 16V
MURATA
GRM21BR71C225KA12L
2
CCMP, CNTC
0.33 µF X7R 10% 25V
MURATA
GRM21BR71E334KA01L
1
CFS
0.27 µF X7R 10% 25V
MURATA
GRM21BR71E274KA01L
4
CIN
4.7 µF X7R 10% 100V
TDK
C5750X7R2A475K
4
CO
10 µF X7R 10% 50V
TDK
C4532X7R1H106K
1
COV
47 pF COG/NPO 5% 50V
AVX
08055A470JAT2A
1
CREF, CSS
1 µF X7R 10% 25V
MURATA
GRM21BR71E105KA01L
Copyright © 2009–2015, Texas Instruments Incorporated
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Product Folder Links: LM3424 LM3424-Q1



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