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參數(shù)資料
| 型號(hào)： | CAT4237 |
| 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(dòng)器 |
| 文件頁(yè)數(shù)： | 8/13頁(yè) |
| 文件大?。?/td> | 533K |
| 代理商： | CAT4237 |
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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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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| CAT4237_07 | 制造商:CATALYST 制造商全稱(chēng):Catalyst Semiconductor 功能描述:High Voltage CMOS Boost White LED Driver |
| CAT4237_08 | 制造商:CATALYST 制造商全稱(chēng):Catalyst Semiconductor 功能描述:High Voltage CMOS Boost White LED Driver |
| CAT4237BEVB | 功能描述:BOARD EVALUATION DPP CAT4237B RoHS:是 類(lèi)別:編程器，開(kāi)發(fā)系統(tǒng) >> 評(píng)估板 - LED 驅(qū)動(dòng)器 系列:* 標(biāo)準(zhǔn)包裝:1 系列:PowerWise® 電流 - 輸出 / 通道:20mA 輸出及類(lèi)型:1，非隔離 輸出電壓:17V 特點(diǎn):可調(diào)光 輸入電壓:2.7 ~ 5.5 V 已供物品:板 已用 IC / 零件:LM3508 相關(guān)產(chǎn)品:LM3508TLX-ND - IC LED DRVR WHT BCKLGT 9USMDLM3508TLDKR-ND - IC LED DRVR WHT BCKLGT 9MICROSMDLM3508TLCT-ND - IC LED DRVR WHT BCKLGT 9MICROSMDLM3508TLTR-ND - IC LED DRVR WHT BCKLGT 9MICROSMD |
| CAT4237BGEVB | 功能描述:CAT4237 1, Non-Isolated Output LED Driver Evaluation Board 制造商:on semiconductor 系列:- 零件狀態(tài):有效 電流 - 輸出/通道:30mA 輸出和類(lèi)型:1，非隔離 電壓 - 輸出:30V 特性:可調(diào)光 電壓 - 輸入:2.8 V ~ 5.5 V 所含物品:板 使用的 IC/零件:CAT4237 標(biāo)準(zhǔn)包裝:1 |
| CAT4237TD | 制造商:CATALYST 制造商全稱(chēng):Catalyst Semiconductor 功能描述:High Voltage CMOS Boost White LED Driver |
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