LT3496 LINER [Linear Technology], LT3496 Datasheet - Page 11

• Manufacturer Part Number: LT3496
• Description: Triple Output LED Driver
• Manufacturer: LINER [Linear Technology]

Table 1. Ceramic Capacitor Manufacturers
Inductor Selection
Several inductors that work well with the LT3496 are listed
in Table 2. However, there are many other manufacturers
and devices that can be used. Consult each manufacturer
for more detailed information and their entire range of
parts. Ferrite core inductors should be used to obtain the
best effi ciency. Choose an inductor that can handle the
necessary peak current without saturating, and ensure that
the inductor has a low DCR (copper-wire resistance) to
minimize I
shield should be used to prevent noise radiation and cross
coupling among the three channels.
Diode Selection
The Schottky diode conducts current during the interval
when the switch is turned off. Select a diode V
for the maximum SW voltage. It is not necessary that
the forward current rating of the diode equal the switch
current limit. The average current, I
is a function of the switch duty cycle. Select a diode with
forward current rating of:
where I
If using the PWM feature for dimming, it is important to
consider diode leakage, which increases with the tem-
perature from the output during the PWM low interval.
Therefore, choose the Schottky diode with suffi cient low
leakage current. Table 3 shows several Schottky diodes
that work well with the LT3496.
APPLICATIONS INFORMATION
I
F
Taiyo Yuden
= I
VENDOR
Murata
Kemet
AVX
L
L
is the inductor current.
• (1 – D)
2
R power losses. An inductor with a magnetic
Ceramic
Ceramic
Ceramic
Ceramic
TYPE
F
, through the diode
X5R, X7R
X5R, X7R
X5R, X7R
X5R, X7R
SERIES
R
rated
Table 2. Surface Mount Inductors
PART NUMBER
Sumida
CMD4D06
CDRH3D16
CDRH4D28
CDRH5D28
CooperET
SD3112
SD14
SD20
SD25
Tayio Yuden
NR3015
NP04SZB
Table 3. Schottky Diodes
PART NUMBER
ZETEX
ZLLS350
ZLLS400
VALUE
(μH)
2.2
3.3
2.2
3.3
4.7
2.2
3.3
4.7
2.2
4.7
4.7
10
15
22
33
10
15
22
33
10
15
22
V
R
40
40
(V)
(Ω MAX)
0.2058
0.1655
0.2053
0.2149
0.116
0.174
0.072
0.085
0.105
0.128
0.149
0.122
0.189
0.140
0.165
0.246
0.075
0.100
0.180
0.210
DCR
0.06
0.12
I
I
RMS
0.38
0.52
F
0.95
0.77
1.20
1.10
0.90
1.00
0.76
0.75
0.97
0.90
0.74
1.25
1.12
1.11
1.48
1.02
0.95
0.77
(A)
0.9
1.1
1.6
1.2
(A)
W × L × H (mm3)
LT3496
3.5 × 4.3 × 0.8
3.8 × 3.8 × 1.8
5.0 × 5.0 × 3.0
6.0 × 6.0 × 3.0
3.1 × 3.1 × 1.2
5.0 × 5.0 × 1.4
5.0 × 5.0 × 2.0
5.0 × 5.0 × 2.5
3.0 × 3.0 × 1.5
4.0 × 4.0 × 1.8
PACKAGE
SOD523
SOD323
SIZE
11
3496fe