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參數(shù)資料
| 型號： | CAT4201 |
| 元件分類： | LED驅(qū)動器 |
| 英文描述： | 350mA High Efficiency Step Down LED Driver |
| 中文描述： | 350mA的高效率LED驅(qū)動下步 |
| 文件頁數(shù)： | 8/15頁 |
| 文件大小： | 330K |
| 代理商： | CAT4201 |
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 |
|---|---|
| CAT4201AEVB | 功能描述:BOARD EVALUATION DPP CAT4201A RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - LED 驅(qū)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(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 |
| CAT4201AGEVB | 功能描述:LED 照明開發(fā)工具 EVAL BOARD FOR LED DRIVER RoHS:否 制造商:Fairchild Semiconductor 產(chǎn)品:Evaluation Kits 用于:FL7732 核心: 電源電壓:120V 系列: 封裝: |
| CAT4201TD | 制造商:ON Semiconductor 功能描述:IC LED DRIVER HI EFFICIENCY |
| CAT4201TD-GT3 | 功能描述:LED照明驅(qū)動器 350mA Hi-Efficiency Step-Down RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N |
| 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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