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| 型号： | LT3478IFE-1#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 10/24页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR HP CONS CURR 16TSSOP |
| 标准包装： | 2,500 |
| 恒定电流： | 是 |
| 拓扑： | PWM，降压（降压），升压（升压） |
| 输出数： | 1 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 车载，背光 |
| 类型 - 次要： | 颜色，白色 LED |
| 频率： | 200kHz ~ 2.25MHz |
| 电源电压： | 2.8 V ~ 36 V |
| 输出电压： | 42V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 供应商设备封装： | 16-TSSOP-EP |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 125°C |
LT3478/LT3478-1
APPLICATIO S I FOR ATIO
Inductor Selection
Several inductors that work well with the LT3478/LT3478-1
are listed in Table 1. However, there are many other manu-
facturers and inductors that can be used. Consult each
manufacturer for more detailed information and their entire
range of parts. Ferrite cores should be used to obtain the
best ef?ciency. Choose an inductor that can handle the
necessary peak current without saturating. Also ensure
that the inductor has a low DCR (copper-wire resistance)
to minimize I 2 R power losses. Values between 4.7μH and
22μH will suf?ce for most applications.
Inductor manufacturers specify the maximum current
rating as the current where inductance falls by a given
percentage of its nominal value. An inductor can pass a
current greater than its rated value without damaging it.
Aggressive designs where board space is precious will
exceed the maximum current rating of the inductor to save
space. Consult each manufacturer to determine how the
maximum inductor current is measured and how much
more current the inductor can reliably conduct.
Capacitor Selection
Low ESR (equivalent series resistance) ceramic capaci-
tors should be used at the output to minimize the output
ripple voltage. Use only X5R or X7R dielectrics, as these
materials retain their capacitance over wider voltage and
temperature ranges than other dielectrics. A 4.7μF to
10μF output capacitor is suf?cient for most high output
current designs. Some suggested manufacturers are
listed in Table 2.
Diode Selection
Schottky diodes, with their low forward voltage drop and
fast switching speed, are ideal for LT3478/LT3478-1 ap-
plications. Table 3 lists several Schottky diodes that work
well. The diode’s average current rating must exceed the
application’s average output current. The diode’s maximum
reverse voltage must exceed the application’s output volt-
age. A 4.5A diode is suf?cient for most designs. For PWM
dimming applications, be aware of the reverse leakage
current of the diode. Lower leakage current will drain the
output capacitor less, allowing for higher dimming range.
The companies below offer Schottky diodes with high
voltage and current ratings.
Table 1. Suggested Inductors
MANUFACTURER PART NUMBER
CDRH104R-100NC
CDRH103RNP-4R7NC-B
CDRH124R-100MC
CDRH104R-5R2NC
FDV0630-4R7M
IDC (A)
3.8
4
4.5
5.5
4.2
INDUCTANCE (μH)
10
4.7
10
5.2
4.7
MAX DCR (m Ω )
35
30
28
22
49
L × W × H (mm)
10.5 × 10.3 × 4.0
10.5 × 10.3 × 3.1
12.3 × 12.3 × 4.5
10.5 × 10.3 × 4.0
7.0 × 7.7 × 3.0
MANUFACTURER
Sumida
www.sumida.com
Toko
www.toko.com
UP4B-220
7.6
22
34
22 × 15 × 7.9
Cooper
www.cooperet.com
Table 2. Ceramic Capacitor Manufacturers
MANUFACTURER
Taiyo Yuden
AVX
Murata
Table 3. Suggested Diodes
PHONE NUMBER
(408) 573-4150
(803) 448-9411
(714) 852-2001
WEB
www.t-yuden.com
www.avxcorp.com
www.murata.com
MANUFACTURER PART NUMBER
UPS340
MAX CURRENT (A)
3
MAX REVERSE VOLTAGE
40
WEB
Microsemi
www.microsemi.com
B520C
B530C
B340A
B540C
PDS560
5
5
3
5
5
30
30
40
40
60
Diodes, Inc.
www.diodes.com
34781f
10
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