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| LM3424 Datasheet, PDF (49/69 Pages) National Semiconductor (TI) – Constant Current N-Channel Controller with Thermal Foldback for Driving LEDs | |||
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www.ti.com
LM3424, LM3424-Q1
SNVS603C â AUGUST 2009 â REVISED AUGUST 2015
8.2.4 Buck-Boost Application
10V ± 30V
D1
VIN
CIN
L1
RUV2
1
VIN
LM3424
20
HSP
RHSP
2
EN
19
HSN
RHSN
CCMP
3
COMP
18
SLOPE
RSLP
RCSH
4
CSH
17
IS
2A
ILED
DIM
Q2
COUT
CFS
RFS
RSNS
VIN
RF
RUV1
RT
5
RT/SYNC
RUVH
6
nDIM
CSS
7
SS
RGAIN
8
TGAIN
16
VCC
CBYP
15
GATE
14
GND
13
DDRV
RPU
Q7
CF
DIM
ROV2
Q1
Q6
Q4
CB D2
RLIM RSER
Q5
VIN
RREF1
CREF
9
TSENSE
10
TREF
DAP
12
OVP
11
VS
RREF2
RBIAS
COV
ROV1
Q3
PWM
CNTC
RPOT
8.2.4.1 Design Requirements
⢠Input: 10V to 30V
⢠Output: 4 LEDs at 2A
⢠PWM Dimming up to 10 kHz
⢠Analog Dimming
⢠600-kHz Switching Frequency
Figure 42. Buck-Boost Application
Copyright © 2009â2015, Texas Instruments Incorporated
Product Folder Links: LM3424 LM3424-Q1
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