Datasheet

C
O
D1
Q1
R
OV2
R
OV1
2A
I
LED
R
SNS
R
FS
C
FS
C
OV
Q5
V
IN
10V ± 30V
Q7
Q6
Q4
D2
V
IN
DIM
R
PU
R
SER
DIM
C
B
C
F
R
F
Q2
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
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
R
POT
LM3421, LM3421-Q1
LM3423, LM3423-Q1
SNVS574E –JULY 2008–REVISED MAY 2013 www.ti.com
DESIGN #3 - LM3421 BUCK-BOOST Application
Features
• Input: 10V to 30V
• Output: 4 LEDs at 2A
• PWM Dimming up to 10kHz
• Analog Dimming
• 600 kHz Switching Frequency
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Product Folder Links: LM3421 LM3421-Q1 LM3423 LM3423-Q1