Datasheet

SS
TGAIN
OVP
LM3424
nDIM
V
IN
GND
TSENSE
TREF
DDRV
V
S
C
OUT
DAP
GATE
EN
COMP
V
IN
CSH
RT/SYNC
IS
HSN
SLOPE
V
CC
HSP
D1
L1
C
IN
R
SLP
C
BYP
R
LIM
Q1
C
CMP
R
CSH
R
T
C
SS
R
OV2
R
OV1
R
UV2
R
UV1
R
GAIN
NTC
R
REF1
R
REF2
R
BIAS
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
R
HSP
R
HSN
C
NTC
R
SNS
R
FS
C
FS
C
OV
C
REF
8V ± 28V
1A
I
LED
R
UVH
Q3
PWM
Q2
LM3424
www.ti.com SNVS603B –AUGUST 2009–REVISED OCTOBER 2009
APPLICATIONS INFORMATION
The following designs are provided as reference circuits. For a specific design, the steps in the Design Guide
section should be performed. In all designs, an RC filter (0.1 µF, 10Ω) is recommended at VIN placed as close
as possible to the LM3424 device. This filter is not shown in the following designs.
DESIGN #2 - BOOST Application
Features
• Input: 8V to 28V
• Output: 9 LEDs at 1A
• 65°C - 100°C Thermal Foldback
• PWM Dimming up to 30kHz
• 700 kHz Switching Frequency
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Product Folder Links: LM3424