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参数资料
| 型号： | CAT4201AEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 8/14页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION DPP CAT4201A |
| 设计资源： | CAT4201AEVB Schematic CAT4201AEVB Gerber Files CAT4201AEVB Bill of Materials |
| 标准包装： | 1 |
| 系列： | * |
CAT4201
Simplified Block Diagram
12 V/24 V
VBAT
CTRL
30 k W
20 m A
7V
EN
OFF ? Time Control
SW
PWM
Controller
1.2 V
Reference
+
–
EN
1.2 V
RSET
ON ? Time Control
R 2
1 W
GND
Figure 22. CAT4201 Simplified Block Diagram
V RSET (V)
R SET (k W )
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 32 V can be
driven with bias currents of up to 350 mA.
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 Discontinuous Conduction
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 2.5 A/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
Table 7 lists the various LED currents and the associated
RSET resistors.
Table 7. RSET RESISTOR SELECTION
LED Current (A) RSET (k W )
Mode (DCM). This operating mode results in an average
LED current which is equal to half of the peak switching
current.
http://onsemi.com
8
0.10
0.15
0.20
0.25
0.30
0.35
33
21
15
12
10
8.25
相关PDF资料 |
PDF描述 |
|---|---|
| CAT4238AEVB | BOARD EVALUATION DPP CAT4238A |
| CAT4240AEVB | BOARD EVALUATION DPP CAT4240A |
| CB1A-R-WM-12V | RELAY AUTOMOTIVE SPST 40A 12V |
| CB3127-000 | D-1744-03-LF |
| CB5065-000 | HEAT SHRINK TUBING |
相关代理商/技术参数 |
参数描述 |
|---|---|
| CAT4201AGEVB | 功能描述:LED 照明开发工具 EVAL BOARD FOR LED DRIVER RoHS:否 制造商:Fairchild Semiconductor 产品:Evaluation Kits 用于:FL7732 核心: 电源电压:120V 系列: 封装: |
| CAT4201TD | 制造商:ON Semiconductor 功能描述:IC LED DRIVER HI EFFICIENCY |
| CAT4201TD-GT3 | 功能描述:LED照明驱动器 350mA Hi-Efficiency Step-Down RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体: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 |
| CAT4237 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:High Voltage CMOS Boost White LED Driver |
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