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| LM3424 Datasheet, PDF (57/69 Pages) National Semiconductor (TI) – Constant Current N-Channel Controller with Thermal Foldback for Driving LEDs | |||
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www.ti.com
8.2.8 Buck-Boost Application
15V ± 60V
VIN
CIN
L1
LM3424, LM3424-Q1
SNVS603C â AUGUST 2009 â REVISED AUGUST 2015
D1
1
VIN
LM3424
20
HSP
RHSP
RUV2
2
EN
RHSN
19
HSN
CCMP
3
COMP
18
SLOPE
RSLP
CFLT
SYNC
RFLT
RCSH
RT
CAC
4
CSH
5
RT/SYNC
6
nDIM
17
IS
16
VCC
CBYP
15
GATE
Q1
RUV1
CSS
7
SS
14
GND
RLIM
RGAIN
8
TGAIN
13
DDRV
2.5A
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 46. Buck-Boost Application
8.2.8.1 Design Requirements
⢠Input: 15 V to 60 V
⢠Output: 8 LEDs at 2.5 A
⢠80°C to 110°C Thermal Foldback
⢠500-kHz Switching Frequency
⢠External Synchronization > 500 kHz
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Product Folder Links: LM3424 LM3424-Q1
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