Datasheet

C
O
D1
R
OV2
R
OV1
R
SNS
R
FS
C
FS
C
OV
9V ± 36V
750 mA
I
LED
Q2
L2
OVP
nDIM
LM3421
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
CSH
R
T
R
UV2
R
UV1
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
R
HSN
R
HSP
Q3
PWM
R
UVH
C
T
C
IN
C
SEP
LM3421, LM3421-Q1
LM3423, LM3423-Q1
SNVS574E –JULY 2008–REVISED MAY 2013 www.ti.com
DESIGN #8 - LM3421 SEPIC Application
Features
• Input: 9V to 36V
• Output: 5 LEDs at 750mA
• PWM Dimming up to 30 kHz
• 500 kHz Switching Frequency
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Product Folder Links: LM3421 LM3421-Q1 LM3423 LM3423-Q1