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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(yè)數(shù)： | 8/15頁(yè) |
| 文件大小： | 330K |
| 代理商： | CAT4201TD-GT3 |
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CAT4201
Doc. No. MD-5025 Rev. B
8
Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
SIMPLIFIED BLOCK DIAGRAM
Figure 1. CAT4201 Simplified Block Diagram
BASIC OPERATION
The CAT4201 is a high efficiency step-down regulator
designed to drive series connected high-power LEDs.
LED strings with total forward voltages of up to 20V
can be driven with bias currents of up to 350mA.
During the first switching phase, an integrated high
voltage power MOSFET allows the inductor current to
charge linearly until the peak maximum level is
reached, at which point the MOSFET is switched off
and the second phase commences, allowing the
inductor current to then flow through the Schottky
diode circuit and discharge linearly back to zero
current.
The switching architecture ensures the device will
always operate at the cross-over point between
Continuous Conduction Mode (CCM) and Discon-
tinuous Conduction Mode (DCM). This operating
mode results in an average LED current which is
equal to half of the peak switching current.
LED pin current
The LED current is set by the external RSET resistor
connected to the regulated output of the RSET pin. An
overall current gain ratio of approximately 2.5A/mA
exists between the average LED current and the
RSET current, hence the following equation can be
used to calculate the LED current.
LED Current (A)
2.5 x V
RSET
(V) / R
SET
(k
)
Table 2 lists the various LED currents and the
associated RSET resistors.
LED current (A)
0.10
0.15
0.20
0.25
0.30
0.35
RSET (k
)
33
21
15
12
10
8.25
Table 2. RSET Resistor Selection
1.2V
Reference
+
–
ON-Time Control
OFF-Time Control
1.2V
1
R
2
7V
30k
20μA
EN
EN
SW
GND
RSET
CTRL
VBAT
12V/24V
PWM
Controller
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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 |
| CAT4237 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:High Voltage CMOS Boost White LED Driver |
| CAT4237_07 | 制造商:CATALYST 制造商全稱:Catalyst Semiconductor 功能描述:High Voltage CMOS Boost White LED Driver |
| CAT4237_08 | 制造商:CATALYST 制造商全稱: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 |
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