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| 型号： | CAT4137TD-T3 |
| 厂商： | ON Semiconductor |
| 文件页数： | 10/15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
Application Information
R1 +
External Component Selection
Capacitors
The CAT4137 only requires small ceramic capacitors of
1 m F on the input and 0.22 m F on the output. The output
capacitor should be rated at 30 V or greater. Under normal
conditions, a 1 m F input capacitor is sufficient. For
applications with higher output power, a larger input
capacitor of 2.2 m F or 4.7 m F may be appropriate. X5R and
X7R capacitor types are ideal due to their stability across
temperature range.
Inductor
A 22 m H inductor is recommended for most of the
CAT4137 applications. In cases where the efficiency is
critical, inductances with lower series resistance are
preferred. Several inductor types from various vendors can
be used. Figure 24 shows how different inductor types affect
the efficiency across the load range.
Schottky Diode
The current rating of the Schottky diode must exceed the
peak current flowing through it. The Schottky diode
performance is rated in terms of its forward voltage at a
given current. In order to achieve the best efficiency, this
forward voltage should be as low as possible. The response
time is also critical since the driver is operating at 1 MHz.
Central Semiconductor Schottky CMDSH2 ? 3 (200 mA
rated) or the CMDSH ? 3 (100 mA rated) is recommended
for most applications.
LED Current Setting
The LED current is set by the external resistor between the
feedback pin (FB) and ground. The formula below gives the
relationship between the resistor and the current:
0.3 V
LED current
100
3 LEDs
VIN = 3.6 V
Table 5. RESISTOR R1 AN D LED CURRENT
LED Current (mA) R1 ( W )
5 60
90
80
SUMIDA CDRH3D16 ? 220
10
15
20
25
30
20
15
12
70
MURATA LQH32CN220
PANASONIC ELJ ? EA220
30
10
PANASONIC ELJ ? PC220
60
5
10
15
20
25
30
LED CURRENT (mA)
Figure 24. Efficiency for Various Inductors
http://onsemi.com
10
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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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