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參數(shù)資料
| 型號： | CAT4137 |
| 元件分類： | LED驅(qū)動器 |
| 英文描述： | CMOS Boost Converter- White LED Driver |
| 中文描述： | 的CMOS升壓轉(zhuǎn)換器，白光LED驅(qū)動器 |
| 文件頁數(shù)： | 8/14頁 |
| 文件大?。?/td> | 504K |
| 代理商： | CAT4137 |
CAT4137
2005 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
8 of 14
Doc. 5012 , Rev. A
DEVICE OPERATION
The CAT4137 is a fixed frequency (1MHz),
low
noise,
inductive
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 0.3V across
the external feedback resistor connected to
the feedback pin (FB). The value of external
resistor will accurately set the LED bias
current accordingly (0.3V/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.
boost
converter
While in normal operation, the device will
comfortably deliver up to 30mA 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 24V, 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 29V. 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 150oC. In
the event of a thermal overload condition the
device will automatically shutdown and wait till
the junction temperatures cools to 130oC before
normal operation is resumed.
BLOCK DIAGRAM
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| CAT4137TS | CMOS Boost Converter- White LED Driver |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| CAT4137AEVB | 功能描述:BOARD EVALUATION DPP CAT4137A RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - LED 驅(qū)動器 系列:* 標(biāo)準(zhǔn)包裝:1 系列:PowerWise® 電流 - 輸出 / 通道:20mA 輸出及類型:1，非隔離 輸出電壓:17V 特點(diǎn):可調(diào)光 輸入電壓:2.7 ~ 5.5 V 已供物品:板 已用 IC / 零件:LM3508 相關(guān)產(chǎn)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 |
| CAT4137TD | 制造商:CATALYST 制造商全稱:Catalyst Semiconductor 功能描述:CMOS Boost Converter - White LED Driver |
| CAT4137TD-GT3 | 功能描述:LED照明驅(qū)動器 LED Driver,Boost 5 LED,series RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
| CAT4137TD-T3 | 功能描述:LED照明驅(qū)動器 Boost Converter White LED RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
| CAT4137TS | 制造商:CATALYST 制造商全稱:Catalyst Semiconductor 功能描述:CMOS Boost Converter - White LED Driver |
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