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LM3421 Datasheet(PDF) 37 Page - Texas Instruments

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Part # LM3421
Description  N-Channel Controllers for Constant-Current LED Drivers
PDF  72 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LM3421 Datasheet(HTML) 37 Page - Texas Instruments

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MAX
IN
MAX
T
V
V
-
-
=
1-DMAX
DMAX
ICIN-RMS = ILED x
12
ICIN-RMS =
iL-PP
(1-DMID)
D
I
I
LED
RMS
CIN
x
x
=
-
MID
CIN =
VIN-PP x fSW
ILED x D
CIN =
8 x VIN-PP x fSW
iL-PP
CIN =
ILED x (1 - D) x D
VIN-PP x fSW
x
=
0
U
T
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LM3421, LM3421-Q1, LM3423, LM3423-Q1
www.ti.com
SNVS574F – JULY 2008 – REVISED JULY 2015
Typical Applications (continued)
Buck
(67)
Boost and Buck-Boost
(68)
8.2.1.2.8
Input Capacitance
Set the nominal input voltage ripple (
ΔvIN-PP) by solving for the required capacitance (CIN):
Buck
(69)
Boost
(70)
Buck-Boost
(71)
Use DMAX to set the worst case input voltage ripple, when solving for CIN in a buck-boost regulator and DMID = 0.5
when solving for CIN in a buck regulator.
The minimum allowable RMS input current rating (ICIN-RMS) can be approximated:
Buck
(72)
Boost
(73)
Buck-Boost
(74)
8.2.1.2.9
NFET
The NFET voltage rating should be at least 15% higher than the maximum NFET drain-to-source voltage (VT-
MAX):
Buck
(75)
Boost
Copyright © 2008–2015, Texas Instruments Incorporated
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Product Folder Links: LM3421 LM3421-Q1 LM3423 LM3423-Q1



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