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參數(shù)資料
| 型號： | CAT4237TD |
| 英文描述： | High Voltage CMOS Boost White LED Driver |
| 中文描述： | 高電壓的CMOS升壓白光LED驅(qū)動器 |
| 文件頁數(shù)： | 8/13頁 |
| 文件大?。?/td> | 533K |
| 代理商： | CAT4237TD |
CAT4237
2005 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
8 of 13
Doc. No. 5013, Rev. A
APPLICATION INFORMATION
External Component Selection
Capacitors
The CAT4237 only requires small ceramic
capacitors of 4.7uF on the input and 0.22μF
on the output. Under normal condition, a
4.7μF input capacitor is sufficient. For
applications with higher output power, a
larger input capacitor of 10μF may be
appropriate. X5R and X7R capacitor types
are ideal due to their stability across
temperature range.
Inductor
A 33μH inductor is recommended for most of
the CAT4237 applications. In cases where
the efficiency is critical, inductances with
lower series resistance are preferred.
Inductors with current rating of 300mA or
higher
are
recommended
applications. Sumida CDRH3D16-330 33μH
inductor has a rated current of 320mA and a
series resistance (D.C.R.) of 520m
typical.
Schottky Diode
The current rating of the Schottky diode
must exceed the peak current flowing
for
most
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
CMDSH05-4
(500mA
recommended for most applications.
LED Current Setting
The LED current is set by the external
resistor R1 connected 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
Schottky
rated)
diode
is
R1 (
W
)
60
30
20
15
12
10
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| CAT4237TS | High Voltage CMOS Boost White LED Driver |
| CAT4240 | 6 Watt Boost LED Driver |
| CAT4240TD-GT3 | 6 Watt Boost LED Driver |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| CAT4237TD-26771T3 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Catalyst Semiconductor 功能描述: |
| CAT4237TD-GT3 | 功能描述:LED照明驅(qū)動器 LED Driver,Boost 8 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(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
| CAT4237TD-GT3 | 制造商:ON Semiconductor 功能描述:IC, WHITE LED DRIVER, BOOST, TSOT-23-5 |
| CAT4237TD-T3 | 功能描述:LED照明驅(qū)動器 High Voltage Boost 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(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
| CAT4237TS | 制造商:CATALYST 制造商全稱:Catalyst Semiconductor 功能描述:High Voltage CMOS Boost White LED Driver |
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