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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 |
| 文件頁數(shù)： | 7/14頁 |
| 文件大小： | 319K |
| 代理商： | CAT4240TD-GT3 |
CAT4240
Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
7
Doc. No. MD-5026 Rev. B
DEVICE OPERATION
The CAT4240 is a fixed frequency (1MHz), low noise,
inductive boost converter that provides a constant
current with excellent line and load regulation. The
device uses a high-voltage CMOS power switch
between the SW pin and ground to energize the
inductor. When the switch is turned off, the stored
energy in the inductor is released into the load via the
Schottky diode.
The on/off duty cycle of the power switch is internally
adjusted and controlled to maintain a constant
regulated voltage of 0.3V across the feedback resistor
connected to the feedback pin (FB). The value of the
resistor sets the LED current accordingly (0.3V/R1).
During the initial power-up stage, the duty cycle of the
internal power switch is limited to prevent excessive
in-rush currents and thereby provide a “soft-start”
mode of operation.
When the inductor is connected to a 9V supply or
higher, the CAT4240 can drive 6 LEDs in series at
300mA delivering a total power of 6 Watts into the
load. A separate 5V supply voltage is connected to
the VIN pin.
In the event of an “Open LED” fault condition, where
the feedback control loop becomes open, the output
voltage will continue to increase. Once this voltage
exceeds 40V, an internal protection circuit will become
active and place the device into a very low power safe
operating mode where only a small amount of power
is transferred to the output. This is achieved by
pulsing the switch once every 60
μ
s or so, and keeping
it on for about 1
μ
s.
Thermal overload protection circuitry has been included
to prevent the device from operating at unsafe junction
temperatures above 150oC. In the event of a thermal
overload condition the device will automatically
shutdown and wait till the junction temperatures cools
to 130oC before normal operation is resumed.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| CAT-42506 | 制造商:Thomas & Betts 功能描述:1/4' YELLOW 6 PCS. PER BAG |
| CAT4254VP2-GT3 | 制造商:Catalyst Semiconductor 功能描述: 制造商:ON Semiconductor 功能描述: |
| CAT431L | 制造商:CATALYST 制造商全稱:Catalyst Semiconductor 功能描述:Low-Voltage Adjustable Precision Voltage Reference |
| 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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