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| LM3424 Datasheet, PDF (55/69 Pages) National Semiconductor (TI) – Constant Current N-Channel Controller with Thermal Foldback for Driving LEDs | |||
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www.ti.com
8.2.7 Buck Application
15V ± 50V
VIN
CIN
L1
LM3424, LM3424-Q1
SNVS603C â AUGUST 2009 â REVISED AUGUST 2015
RUV2
RUV1
1
VIN
LM3424
20
HSP
RHSP
2
EN
19
HSN
RHSN
CCMP
3
COMP
18
SLOPE
RSLP
RCSH
4
CSH
17
IS
RT
5
RT/SYNC
RUVH
6
nDIM
16
VCC
CBYP
15
GATE
CFS
RSNS
RFS
CO
RPU D2
D1
L1
Q1
Q2
1.25A
ILED
ROV2
Q4
CSS
7
SS
14
GND
RLIM
CDIM
RGAIN
8
TGAIN
13
DDRV
RREF1
CREF
9
TSENSE
10
TREF
DAP
12
OVP
11
VS
RREF2
RBIAS
COV
ROV1
Q3
PWM
8.2.7.1 Design Requirements
⢠Input: 15 V to 50 V
⢠Output: 3 LEDS AT 1.25 A
⢠PWM Dimming up to 50 kHz
⢠Analog Dimming
⢠700-kHz Switching Frequency
CNTC
RPOT
Figure 45. Buck Application
Copyright © 2009â2015, Texas Instruments Incorporated
Product Folder Links: LM3424 LM3424-Q1
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