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參數(shù)資料
| 型號： | CAT4238TD-GT3 |
| 英文描述： | High Efficiency 10 LED Boost Converter |
| 中文描述： | 高效率的LED升壓轉換器10 |
| 文件頁數(shù)： | 8/14頁 |
| 文件大小： | 290K |
| 代理商： | CAT4238TD-GT3 |
CAT4238
Doc. No. 5019 Rev. A
8
2006 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
APPLICATION INFORMATION
External Component Selection
Capacitors
The CAT4238 only requires small ceramic capacitors
of 4.7
μ
F 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 47μH inductor is recommended for most of the
CAT4238 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 for most applications.
Sumida CDC5D23B-470 47μH inductor has a rated
current of 490mA and a series resistance (D.C.R.) of
420m
Ω
typical.
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 diode CMDSH05-4 (500mA rated) is
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
R1 (
Ω
)
60
30
20
15
12
10
Table 1. Resistor R1 and LED current
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| CAT4238TD-GT3 | 制造商:ON Semiconductor 功能描述:IC LED DRIVER BOOST TSOT-23-5 制造商:ON Semiconductor 功能描述:IC, LED DRIVER, BOOST, TSOT-23-5 |
| CAT4238TDI-G | 制造商:ON Semiconductor 功能描述:IC 10-LED DRIVER LOW NOISE BOOST |
| CAT4240 | 制造商:CATALYST 制造商全稱:Catalyst Semiconductor 功能描述:6 Watt Boost LED Driver |
| CAT4240_0711 | 制造商:CATALYST 制造商全稱:Catalyst Semiconductor 功能描述:6 Watt Boost LED Driver |
| CAT4240AEVB | 功能描述:BOARD EVALUATION DPP CAT4240A RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - LED 驅動器 系列:* 標準包裝:1 系列:PowerWise® 電流 - 輸出 / 通道:20mA 輸出及類型:1，非隔離 輸出電壓:17V 特點:可調光 輸入電壓:2.7 ~ 5.5 V 已供物品:板 已用 IC / 零件:LM3508 相關產品: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 |
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