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参数资料
| 型号： | CAT4237TD-GT3 |
| 厂商： | ON Semiconductor |
| 文件页数： | 9/12页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR WHT BCKLGHT TSOT23-5 |
| 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： | 800kHz ~ 1.3MHz |
| 电源电压： | 2.8 V ~ 5.5 V |
| 输出电压： | 30V |
| 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： | CAT4237TD-GT3DKR |
CAT4237
Open LED Protection
In the event of an “Open LED” fault condition, the
CAT4237 will continue to boost the output voltage with
maximum power until the output voltage reaches
approximately 35 V. Once the output exceeds this level, the
internal circuitry immediately places the device into a very
low power mode where the total input power is limited to
about 4 mW (about 1 mA input current with a 3.6 V supply).
The SW pin clamps at a voltage below its maximum rating
of 60 V. There is no need to use an external zener diode
between Vout and the FB pin. A 50 V rated C 2 capacitor is
required to prevent any overvoltage damage in the open
2.0
1.5
1.0
0.5
LED condition.
V IN
C 1
L
33 m H
Schottky 100 V
(Central CMSH1 ? 100)
V OUT
C 2
0
2.5 3.0 3.5 4.0 4.5 5.0
INPUT VOLTAGE (V)
Figure 23. Open LED Supply Current vs. V IN without
Zener
4.7 m F
VIN
SW
0.22 m F
50
CAT4237
OFF ON
SHDN
GND
FB
V FB = 300 mV
R1
15 W
45
40
Figure 21. Open LED Protection without Zener
35
30
2.5
3.0
3.5
4.0
4.5
5.0
INPUT VOLTAGE (V)
Figure 24. Open LED Output Voltage vs. V IN without
Zener
SW PIN
10 V/div
10 m sec/div
Figure 22. Open LED Switching Waveforms without
Zener
http://onsemi.com
9
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相关代理商/技术参数 |
参数描述 |
|---|---|
| CAT4237TD-GT3 | 制造商:ON Semiconductor 功能描述:IC, WHITE LED DRIVER, BOOST, TSOT-23-5 |
| CAT4237TD-T3 | 功能描述:LED照明驱动器 High Voltage Boost White LED 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 |
| CAT4237TS | 制造商:CATALYST 制造商全称:Catalyst Semiconductor 功能描述:High Voltage CMOS Boost White LED Driver |
| CAT4237TS-TE7 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Catalyst Semiconductor 功能描述: |
| CAT4238 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:High Efficiency 10 LED Boost Converter |
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