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
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
18V ± 38V
700 mA
I
LED
R
BIAS2
R
MAX
Q2
Q3
R
ADJ
Q4
R
CSH
V
CC
V
CC
V
S
V
S
LM3424
www.ti.com SNVS603B –AUGUST 2009–REVISED OCTOBER 2009
DESIGN #4 - BOOST Application
Features
• Input: 18V to 38V
• Output: 12 LEDs at 700mA
• 85°C - 125°C Thermal Foldback
• Analog Dimming
• 700 kHz Switching Frequency
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