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參數(shù)資料
| 型號： | LTC3496EUFD#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 2300 kHz SWITCHING FREQ-MAX, PQCC28 |
| 封裝： | 4 X 5 MM, LEAD FREE, PLASTIC, MO-220, QFN-28 |
| 文件頁數(shù)： | 16/16頁 |
| 文件大?。?/td> | 296K |
| 代理商： | LTC3496EUFD#TRPBF |
LT3496
9
3496f
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 efciency. 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 I2R power losses. An inductor with a magnetic
shield should be used to prevent noise radiation and cross
coupling among the three channels.
Table 2. Surface Mount Inductors
PART NUMBER
VALUE
(H)
DCR
(
Ω MAX) IRMS (A)
SIZE
W
× L × H (mm3)
Sumida
CMD4D06
2.2
0.116
0.95
3.5
× 4.3 × 0.8
3.3
0.174
0.77
CDRH3D16
2.2
0.072
1.20
3.8
× 3.8 × 1.8
3.3
0.085
1.10
4.7
0.105
0.90
CDRH4D28
10
0.128
1.00
5.0
× 5.0 × 3.0
15
0.149
0.76
CDRH5D28
22
0.122
0.9
6.0
× 6.0 × 3.0
33
0.189
0.75
CooperET
SD3112
2.2
0.140
0.97
3.1
× 3.1 × 1.2
3.3
0.165
0.90
4.7
0.246
0.74
SD14
10
0.2058
1.1
5.0
× 5.0 × 1.4
SD20
15
0.1655
1.25
5.0
× 5.0 × 2.0
22
0.2053
1.12
SD25
33
0.2149
1.11
5.0
× 5.0 × 2.5
Tayio Yuden
NR3015
2.2
0.06
1.48
3.0
× 3.0 × 1.5
4.7
0.12
1.02
NP04SZB
4.7
0.075
1.6
4.0
× 4.0 × 1.8
10
0.100
1.2
15
0.180
0.95
22
0.210
0.77
Diode Selection
The Schottky diode conducts current during the interval
when the switch is turned off. Select a diode VR rated
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, IF, through the diode
is a function of the switch duty cycle. Select a diode with
forward current rating of:
IF = IL (1 – D)
where IL is the inductor current.
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 sufcient low
leakage current. Table 3 shows several Schottky diodes
that work well with the LT3496.
Table 3. Schottky Diodes
PART NUMBER
VR (V)
IF (A)
PACKAGE
ZETEX
ZLLS350
40
0.38
SOD523
ZLLS400
40
0.52
SOD323
Programming the LED Current
The LED current of each channel is programmed by con-
necting an external sense resistor RSENSE in series with
the LED load, and setting the voltage regulation threshold
across that sense resistor using CTRL input. If the CTRL
voltage, VCTRL, is less than 1V, the LED current is:
I
V
R
LED
CTRL
SENSE
=
10
If VCTRL is higher than 1V, the LED current is:
I
mV
R
LED
SENSE
=
100
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