- 您现在的位置：买卖IC网 > Datasheet目录318 > CAT4139TD-GT3 (ON Semiconductor)IC LED DRVR WHITE BCKLGT TSOT-5 Datasheet资料下载
参数资料
| 型号： | CAT4139TD-GT3 |
| 厂商： | ON Semiconductor |
| 文件页数： | 8/13页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR WHITE BCKLGT TSOT-5 |
| 特色产品： | CAT4139 |
| 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： | 22V |
| 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： | CAT4139TD-GT3DKR |
CAT4139
Device Operation
The CAT4139 is a fixed frequency (1 MHz), low noise,
inductive boost converter that provides a constant current
with excellent line and load regulation. The device uses a
high ? voltage CMOS power switch between the SW pin and
ground to energize the inductor. When the switch is turned
off, the stored energy in the inductor is released into the load
via the 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 feedback resistor connected to the
feedback pin (FB). The value of the resistor sets the LED
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
Application Information
External Component Selection
Capacitors
The CAT4139 only requires small ceramic capacitors of
4.7 m F on the input and 1 m F on the output. Under normal
condition, a 4.7 m F input capacitor is sufficient. For
applications with higher output power, a larger input
capacitor of 10 m F may be appropriate. X5R and X7R
capacitor types are ideal due to their stability across
temperature range.
currents and thereby provide a “soft ? start” mode of
operation.
In the event of an “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.
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.
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 rectifier CMSH1 ? 40 (1 A
rated) is recommended for most applications.
LED Current Setting
The LED current is set by the external resistor R1
connected between the feedback pin (FB) and ground. The
formula below gives the relationship between the resistor
Inductor
A 22 m H inductor is recommended for most of the
CAT4139 applications. In cases where the efficiency is
critical, inductances with lower series resistance are
and the current:
R1 +
0.3 V
LED current
preferred. Inductors with current rating of 800 mA or higher
are recommended for most applications. Sumida
Table 5. RESISTOR R1 AN D LED CURRENT
CDRH6D28 ? 220 22 m H inductor has a rated current of
1.2 A and a series resistance (D.C.R.) of 128 m W typical.
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
LED Current (mA)
20
25
30
100
300
R1 ( W )
15
12
10
3
1
http://onsemi.com
8
相关PDF资料 |
PDF描述 |
|---|---|
| CAT4237TD-T3 | IC LED DRVR WHITE BCKLGHT TSOT-5 |
| CAT4238TD-GT3 | IC LED DRVR WHITE BCKLGHT TSOT-5 |
| CAT4240TD-GT3 | IC LED DRVR WHITE BCKLGHT TSOT-5 |
| CAT93C56XI | IC EEPROM 2KBIT 2MHZ 8SOIC |
| CAT93C66XI | IC EEPROM 4KBIT 2MHZ 8SOIC |
相关代理商/技术参数 |
参数描述 |
|---|---|
| CAT4139TD-GT3 | 制造商:ON Semiconductor 功能描述:DRIVER LED 0.75A 1MHZ 22V 制造商:ON Semiconductor 功能描述:IC WHITE LED DRIVER BOOST TSOT-23-5 |
| CAT4139TD-GT3 | 制造商:ON Semiconductor 功能描述:IC WHITE LED DRIVER BOOST TSOT-23-5 |
| CAT-41871 | 制造商:Thomas & Betts 功能描述:Cable Accessories Cable Tie Box |
| CAT-41872 | 制造商:Thomas & Betts 功能描述:Cable Accessories Cable Tie Box |
| CAT4201 | 制造商:CATALYST 制造商全称:Catalyst Semiconductor 功能描述:350mA High Efficiency Step Down LED Driver |
发布紧急采购，3分钟左右您将得到回复。