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
Q1
C
CMP
R
CSH
R
T
C
SS
R
OV2
R
OV1
R
UV2
R
UV1
R
GAIN
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
500 mA
I
LED
R
SNS
R
FS
C
FS
C
OV
C
REF
Q5
V
IN
10V ± 70V
Q7
Q6
Q4
D2
V
IN
DIM
R
PU
R
SER
DIM
Q3
PWM
R
UVH
C
B
C
F
R
F
Q2
LM3424
www.ti.com SNVS603B –AUGUST 2009–REVISED OCTOBER 2009
DESIGN #5 - BUCK-BOOST Application
Features
• Input: 10V to 70V
• Output: 6 LEDs at 500mA
• PWM Dimming up to 10 kHz
• 5 sec Fade-up
• MosFET R
DS-ON
Sensing
• 700 kHz Switching Frequency
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