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參數(shù)資料
| 型號： | CAT37TDI |
| 元件分類： | LED驅(qū)動器 |
| 英文描述： | CMOS White LED Driver Boost Converter |
| 中文描述： | 的CMOS白光LED驅(qū)動器升壓轉(zhuǎn)換器 |
| 文件頁數(shù)： | 7/13頁 |
| 文件大?。?/td> | 168K |
| 代理商： | CAT37TDI |
CAT37
7
Doc No. 5005, Rev. R
DIODE SELECTION
Schottky diodes, with their low forward voltage drop and
fast switching speed, are the ideal choice for high
efficiency applications. Table 2 shows several different
Schottky diodes that work well with the CAT37. Make
sure that the diode has a voltage rating greater than the
output voltage. The diode conducts current only when
the power switch is turned off (typically less than one-
third the time), so a 0.4A or 0.5A diode will be sufficient
for most designs.
LED CURRENT PROGRAMMING
The LED current is programmed with a single resistor
connected to the FB pin. The FB pin is internally regulated
to 95 mV, which sets the current flowing through R1 and
the LEDs as equal to
0.095/R1.
For the best accuracy, a 1% or better resistor is
recommended. Table 3 shows several typical 1% R1
values.
For other LED current values, use the following equa-
tion to choose R1.
R1=0.095
I
LED
Most white LEDs are driven at maximum currents of
15mA to 20mA. Some higher power designs will use two
parallel strings of LEDs for greater light output, resulting
in 30mA to 40mA (two strings of 15mA to 20mA) flowing
through the R1 resistor.
APPLICATION INFORMATION
CAPACITOR SELECTION
Low ESR (equivalent series resistance) capacitors should
be used at the output to minimize the output ripple
voltage. The low ESR and small package options
available with multilayer ceramic capacitors make them
excellent choices. The X5R and X7R capacitor types are
preferred because they retain their capacitance over
wider voltage and temperature ranges than the Y5V or
Z5U types. A 1.0
μ
F output capacitor is recommended
for most applications.
The voltage rating of the output capacitor C2 depends on
the number of LEDs driven in the series. A 16 V ceramic
capacitor is recommended when driving 3 or 4 LEDs.
Low profile ceramic capacitors with a 1mm maximum
height/thickness are available for designs height
requirements. Ceramic capacitors also make a good
choice for the input capacitor, which should be mounted
as close as possible to the CAT37. A 1
μ
F or 4.7
μ
F
input capacitor is recommended. Table 1 shows a list of
several ceramic capacitor manufacturers. Consult the
manufacturers for detailed information as new products
and package options are introduced regularly.
Table 1. Ceramic Capacitor Manufacturers
Supplier
Web
Taiyo Yuden
www.t-yuden.com
Murata
www.murata.com
Kemet
www.kemet.com
AVX
www.avxcorp.com
Table 3. R1 Resistor Values
I
LED
(mA)
40
30
20
15
12
10
5
R1 (
)
2.37
3.16
4.75
6.34
7.87
9.53
19.1
Table 2. Schottky Diode Suppliers
Part
Supplier
MBR0520
ON Semiconductor
MBR0530
www.onsemi.com
MBR0540
800.282.9855
ZHCS400
Zetex
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| CAT37TDI-GT3 | 功能描述:LED照明驅(qū)動器 LED Driver Boost 4 LED series RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N |
| CAT37TDI-T2 | 功能描述:IC LED DRVR WHITE BCKLGHT TSOT-5 RoHS:是 類別:集成電路 (IC) >> PMIC - LED 驅(qū)動器 系列:- 標準包裝:1 系列:- 恒定電流:- 恒定電壓:- 拓撲:PWM，切換式電容器（充電泵） 輸出數(shù):1 內(nèi)部驅(qū)動器:是 類型 - 主要:背光 類型 - 次要:白色 LED 頻率:642kHz 電源電壓:2.7 V ~ 5.5 V 輸出電壓:5V 安裝類型:表面貼裝 封裝/外殼:10-VFDFN 裸露焊盤 供應商設備封裝:10-VSON 包裝:剪切帶 (CT) 工作溫度:-30°C ~ 85°C 產(chǎn)品目錄頁面:1371 (CN2011-ZH PDF) 其它名稱:BD1603NUV-E2CT |
| CAT37TDI-T3 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:CMOS White LED Driver Boost Converter |
| CAT37TDI-TE7 | 功能描述:LED照明驅(qū)動器 White LED Boost RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N |
| CAT-38-PP | 功能描述:INSTALL TOOL ORANGE FOR SHR SER RoHS:是 類別:工具 >> 螺線形繞線，伸縮套管 系列:- 標準包裝:1 系列:Slit-N-Wrap® |
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