Datasheet

R
LIM
Q1
R
OV1
C
OV
15V ± 50V
PWM
C
O
D1
R
OV2
1.25A
I
LED
R
SNS
R
FS
C
FS
Q2
D2
L1
Q4
R
PU
C
DIM
OVP
nDIM
LM3423
AGND
V
IN
PGND
DDRV
DAP
GATE
EN
COMP
VIN
CSH
RCT
IS
HSP
RPD
VCC
HSN
C
BYP
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
Q3
C
T
C
IN
FLT DPOL
9 12
TIMR LRDY
10 11
R
CSH
R
UVH
V
IN
LED
STATUS
LIGHT
R
PU2
RPD
RPD
External
Enable
LM3421, LM3421-Q1
LM3423, LM3423-Q1
SNVS574E –JULY 2008–REVISED MAY 2013 www.ti.com
DESIGN #6 - LM3423 BUCK Application
Features
• Input: 15V to 50V
• Output: 3 LEDs at 1.25A
• PWM Dimming up to 50 kHz
• LED Status Indicator
• Zero Current Shutdown
• 700 kHz Switching Frequency
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Product Folder Links: LM3421 LM3421-Q1 LM3423 LM3423-Q1