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參數(shù)資料
| 型號(hào)： | CAT4240TD-GT3 |
| 元件分類： | LED驅(qū)動(dòng)器 |
| 英文描述： | 6 Watt Boost LED Driver |
| 中文描述： | 6瓦升壓LED驅(qū)動(dòng)器 |
| 文件頁(yè)數(shù)： | 8/14頁(yè) |
| 文件大?。?/td> | 319K |
| 代理商： | CAT4240TD-GT3 |
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CAT4240
Doc. No. MD-5026 Rev. B
8
Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
APPLICATION INFORMATION
External Component Selection
Capacitors
The CAT4240 only requires small ceramic capacitors
of 4.7
μ
F on the inductor input, 1μF on the VIN pin and
1μF 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
CAT4240 applications. In cases where the efficiency
is critical, inductances with lower series resistance are
preferred. Inductors with current rating of 800mA or
higher are recommended for most applications.
Sumida CDRH6D28-470 47μH inductor has a rated
current of 800mA and a series resistance (D.C.R.) of
176m
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
rectifier
CMSH1-40
recommended for most applications.
(1A
rated)
is
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)
20
25
30
100
300
R1 (
)
15
12
10
3
1
Table 1. Resistor R1 and LED current
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| CAT4240TD-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 |
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| CAT431LEUK-TE7 | 功能描述:基準(zhǔn)電壓& 基準(zhǔn)電流 1.24V .5% RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Voltage References 拓?fù)浣Y(jié)構(gòu):Shunt References 參考類型:Programmable 輸出電壓:1.24 V to 18 V 初始準(zhǔn)確度:0.25 % 平均溫度系數(shù)（典型值）:100 PPM / C 串聯(lián) VREF - 輸入電壓（最大值）: 串聯(lián) VREF - 輸入電壓（最小值）: 分流電流（最大值）:60 mA 最大工作溫度:+ 125 C 封裝 / 箱體:SOT-23-3L 封裝:Reel |
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