Datasheet

C
O
D1
R
OV2
R
OV1
R
SNS
R
FS
C
FS
C
OV
700 mA
I
LED
R
BIAS2
R
MAX
Q7
Q5
R
ADJ
Q4
R
CSH
V
CC
18V ± 38V
OVP
nDIM
LM3423
AGND
V
IN
PGND
DDRV
DAP
GATE
EN
COMP
VIN
CSH
RCT
IS
HSP
RPD
VCC
HSN
L1
C
BYP
R
LIM
Q1
C
CMP
R
T
R
UV2
R
UV1
1
2
3
4
5
6
7
8
20
19
18
17
16
15
14
13
R
HSN
R
HSP
C
T
C
IN
FLT DPOL
9 12
TIMR LRDY
10 11
V
REF
V
CC
Q6
D3
Q2
R
PU
R
SER
C
DIM
RPD
RPD
External
Enable
Q3
PWM
R
UVH
D2
LM3421, LM3421-Q1
LM3423, LM3423-Q1
SNVS574E –JULY 2008–REVISED MAY 2013 www.ti.com
DESIGN #4 - LM3423 BOOST Application
Features
• Input: 18V to 38V
• Output: 12 LEDs at 700mA
• High Side PWM Dimming up to 30 kHz
• Analog Dimming
• Zero Current Shutdown
• 700 kHz Switching Frequency
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Product Folder Links: LM3421 LM3421-Q1 LM3423 LM3423-Q1