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| 型号： | CAT4137TD-T3 |
| 厂商： | ON Semiconductor |
| 文件页数： | 9/15页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR WHITE BCKLGHT TSOT-5 |
| 标准包装： | 1 |
| 恒定电流： | 是 |
| 拓扑： | PWM，升压（升压） |
| 输出数： | 1 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 700kHz ~ 1.3MHz |
| 电源电压： | 2.2 V ~ 5.5 V |
| 输出电压： | 24V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-5 细型，TSOT-23-5 |
| 供应商设备封装： | TSOT-23-5 |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 85°C |
| 产品目录页面： | 805 (CN2011-ZH PDF) |
| 其它名称： | CAT4137TD-T3DKR |
CAT4137
Device Operation
The CAT4137 is a fixed frequency (1 MHz), low noise,
inductive boost converter providing constant current to the
load. A high voltage internal CMOS power switch is used to
energize the external inductor. When the power switch is
then turned off, the stored energy inductor is released into
the load via the external Schottky diode.
The on/off duty cycle of the power switch is internally
adjusted and controlled to maintain a constant regulated
voltage of 0.3 V across the external feedback resistor
connected to the feedback pin (FB). The value of external
resistor will accurately set the LED bias current accordingly
(0.3 V/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.
V IN
While in normal operation, the device will comfortably
deliver up to 30 mA of bias current into a string of up to 5
white LEDs.
In the event of a “Open-Led” fault condition, where the
feedback control loop becomes open, the output voltage will
continue to increase. Once this voltage exceeds 24 V, an
internal protection circuit will become active and place the
device into a very low power safe operating mode. In
addition, an internal clamping circuit will limit the peak
output voltage to 29 V. If this fault condition is repaired, the
device will automatically resume normal operation.
Thermal overload protection circuitry has been included
to prevent the device from operating at unsafe junction
temperatures above 150 ° C. In the event of a thermal
overload condition the device will automatically shutdown
and wait till the junction temperatures cools to 130 ° C before
normal operation is resumed.
V OUT
SW
C1
1 MHz
Oscillator
Over Voltage
Protection
C2
V REF
V IN
300 mV
Enable
–
+
A 1
R C
+
–
A 2
PWM &
Logic
Driver
N 1
I LED
SHDN
Thermal
Shutdown
& UVLO
C C
R S
GND
Current
Sense
FB
Figure 23. Block Diagram
http://onsemi.com
9
R1
15 W
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相关代理商/技术参数 |
参数描述 |
|---|---|
| CAT4137TS | 制造商:CATALYST 制造商全称:Catalyst Semiconductor 功能描述:CMOS Boost Converter - White LED Driver |
| CAT4139 | 制造商:CATALYST 制造商全称:Catalyst Semiconductor 功能描述:22V High Current Boost White LED Driver |
| CAT4139AEVB | 功能描述:BOARD EVALUATION DPP CAT4139A RoHS:是 类别:编程器，开发系统 >> 评估板 - LED 驱动器 系列:* 标准包装:1 系列:PowerWise® 电流 - 输出 / 通道:20mA 输出及类型:1，非隔离 输出电压:17V 特点:可调光 输入电压:2.7 ~ 5.5 V 已供物品:板 已用 IC / 零件:LM3508 相关产品: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 |
| CAT4139AGEVB | 功能描述:CAT4139 1, Non-Isolated Output LED Driver Evaluation Board 制造商:on semiconductor 系列:- 零件状态:有效 电流 - 输出/通道:100mA 输出和类型:1，非隔离 电压 - 输出:22V 特性:可调光 电压 - 输入:2.8 V ~ 5.5 V 所含物品:板 使用的 IC/零件:CAT4139 标准包装:1 |
| CAT4139TD-GT3 | 功能描述:LED照明驱动器 High Current Boost White 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 |
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