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| LM3424 Datasheet, PDF (39/69 Pages) National Semiconductor (TI) – Constant Current N-Channel Controller with Thermal Foldback for Driving LEDs | |||
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Typical Applications (continued)
8.2.2 Buck-Boost Application
10V ± 70V
VIN
CIN
L1
LM3424, LM3424-Q1
SNVS603C â AUGUST 2009 â REVISED AUGUST 2015
D1
RUV2
RUV1
1
VIN
LM3424
20
HSP
RHSP
2
EN
RHSN
19
HSN
CCMP
3
COMP
18
SLOPE
RSLP
RCSH
4
CSH
17
IS
RT
5
RT/SYNC
6
nDIM
16
VCC
CBYP
15
GATE
Q1
CSS
7
SS
14
GND
RLIM
RGAIN
8
TGAIN
13
DDRV
1A
ILED
COUT
CFS
RFS
RSNS
VIN
ROV2
VIN Q2
RREF1
CREF
9
TSENSE
10
TREF
DAP
12
OVP
11
VS
RREF2
RBIAS
COV
ROV1
CNTC
NTC
Figure 39. Buck-Boost Application
8.2.2.1 Design Requirements
N=6
VLED = 3.5V
rLED = 325 mâ¦
VIN = 24V
VIN-MIN = 10V
VIN-MAX = 70V
fSW = 500 kHz
VSNS = 100 mV
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