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參數(shù)資料
| 型號： | CAT4137TD |
| 元件分類： | LED驅(qū)動器 |
| 英文描述： | CMOS Boost Converter- White LED Driver |
| 中文描述： | 的CMOS升壓轉(zhuǎn)換器，白光LED驅(qū)動器 |
| 文件頁數(shù)： | 9/14頁 |
| 文件大?。?/td> | 504K |
| 代理商： | CAT4137TD |
CAT4137
2005 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
9 of 14
Doc. 5012 , Rev. A
APPLICATION INFORMATION
External Component Selection
Capacitors
The CAT4137 only requires small ceramic
capacitors of 1uF on the input and 0.22μF on
the output. Under normal condition, a 1μF
input capacitor is sufficient. For applications
with higher output power, a larger input
capacitor of 2.2μF or 4.7μF may be
appropriate. X5R and X7R capacitor types
are ideal due to their stability across
temperature range.
Inductor
A 22μH inductor is recommended for most of
the CAT4137 applications. In cases where
the efficiency is critical, inductances with
lower series resistance are preferred.
Several inductor types from various vendors
can be used. Figure 1 shows how different
inductor types affect the efficiency across
the load range.
60
70
80
90
100
5
10
15
20
25
30
LED CURRENT [mA]
E
SUMIDA CDRH3D16-220
MURATA LQH32CN220
PANASONIC ELJ-EA220
PANASONIC ELJ-PC220
3 LEDs
VIN = 3.6V
Figure 1. Efficiency for various inductors
Schottky Diode
The current rating of the Schottky diode
must exceed the peak current flowing
through it. The Schottky diode performance
is rated in terms of its forward voltage at a
given current. In order to achieve the best
efficiency, this forward voltage should be as
low as possible. The response time is also
critical since the driver is operating at 1MHz.
Central Semiconductor Schottky CMDSH2-3
(200mA rated) or the CMDSH-3 (100mA
rated)
are
recommended
applications.
LED Current Setting
The LED current is set by the external
resistor between the feedback pin (FB) and
ground. The formula below gives the
relationship between the resistor and the
current:
R1 = 0.3V/LED current
LED current (mA)
5
10
15
20
25
30
Table 1. Resistor R1 and LED current
for
most
R1 (
W
)
60
30
20
15
12
10
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| CAT4137TD-GT3 | 功能描述:LED照明驅(qū)動器 LED Driver,Boost 5 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 |
| CAT4137TD-T3 | 功能描述:LED照明驅(qū)動器 Boost Converter White LED 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 |
| CAT4137TS | 制造商:CATALYST 制造商全稱:Catalyst Semiconductor 功能描述:CMOS Boost Converter - White LED Driver |
| CAT4139 | 制造商:CATALYST 制造商全稱:Catalyst Semiconductor 功能描述:22V High Current Boost White LED Driver |
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