參數(shù)資料
型號(hào)： CAT4201TD-GT3
元件分類： LED驅(qū)動(dòng)器
英文描述： 350mA High Efficiency Step Down LED Driver
中文描述： 350mA的高效率LED驅(qū)動(dòng)下步
文件頁數(shù)： 12/15頁
文件大?。?/td> 330K
代理商： CAT4201TD-GT3
CAT4201
Doc. No. MD-5025 Rev. B
12
Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
Open LED Behavior
If the LEDs are not connected, the CAT4201 stops
switching and draws very little current.
At power-up with no load connected, the capacitor C2
is charged-up by the CAT4201. As soon as the bottom
side of the capacitor (C2-) reaches 0 volt, as shown
on Figure 9, the CAT4201 stops switching and
remains in the idle mode only drawing about 0.4mA
current from the supply.
Figure 9. Open LED mode
Board Layout
In order to minimize EMI and switching noise, the
Schottky diode, the inductor and the output capacitor
C2 should all be located close to the driver IC. The
input capacitor C1 should be located close to the
VBAT pin and the Schottky diode cathode. The
CAT4201 ground pin should be connected directly to
the ground plane on the PCB. A recommended PCB
layout with component location is shown on Figure 10.
The LEDs are connected by two wires tied to both
sides of the output capacitor C2. The LEDs can be
located away from the driver if needed.
Figure 10. Recommended PCB Layout
In order to further reduce the ripple on the supply rail,
an optional Pi style filter (C-L-C) can be used. A 10μH
inductor rated to the maximum supply current can be
used.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
CAT4201TD-GT3 制造商:ON Semiconductor 功能描述:IC LED DRIVER BUCK TSOT-23-5 制造商:ON Semiconductor 功能描述:IC, LED DRIVER, BUCK, TSOT-23-5
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