LM3424 Datasheet, PDF (62/69 Pages) National Semiconductor (TI) – Constant Current N-Channel Controller with Thermal Foldback for Driving LEDs

LM3424, LM3424-Q1
SNVS603C – AUGUST 2009 – REVISED AUGUST 2015
www.ti.com
10.2 Layout Example
Note critical paths and component placement:
Minimize power loop containing discontinuous currents
Minimize signal current loops (components close to IC)
N Ground plane under IC for signal routing helps minimize noise coupling
discontinuous switching frequency currents
VIN
Input
Power
GND
1
VIN
2
EN
LM3424
20
HSP
19
HSN
3
COMP
18
SLOPE
4
CSH
17
IS
5
16
ILED
RT/SYNC
VCC
PWM
6
nDIM
15
GATE
7
SS
14
GND
8
TGAIN
13
DDRV
TEMP
9
TSENSE
10
TREF
DAP
12
OVP
11
VS
STAR GROUND
Power Ground
Figure 48. Layout Recommendation
62
Submit Documentation Feedback
Copyright © 2009–2015, Texas Instruments Incorporated
Product Folder Links: LM3424 LM3424-Q1