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參數(shù)資料
| 型號： | LM3502SQ-25 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 顯示驅(qū)動器 |
| 英文描述： | Step-Up Converter for White LED Applications |
| 中文描述： | LED DISPLAY DRIVER, QCC16 |
| 封裝： | 1MM HEIGHT, LLP-16 |
| 文件頁數(shù)： | 13/18頁 |
| 文件大?。?/td> | 928K |
| 代理商： | LM3502SQ-25 |
Application Information
WHITE LED CURRENT SETTING
The LED current is set using the following equation:
20131730
I
LED
: White LED Current.
V
Fb
: Feedback Pin Voltage. V
Fb
= 0.25V, Typical.
R1:
Currrent Setting Resistor.
WHITE LED DIMMING
For dimming the white LED string with a pulse-width-
modulated (PWM) signal on the Cntrl pin, care must taken to
balance the tradeoffs between audible noise and white LED
brightness control. For best PWM duty cycle vs. white LED
current linearity, the PWM frequency should be between
200Hz and 500Hz. Other PWM frequencies can be used, but
the linearity over input voltage and duty cycle variation will
not be as good as what the 200Hz to 500Hz PWM frequency
spectrum provides. To minimize audible noise interference, it
is recommended that a output capacitor with minimal sus-
ceptibility to piezoelectric induced stresses be used for the
particular applications that require minimal or no audible
noise interference.
If V
OUT2
is not used , En2 must be grounded
20131735
FIGURE 5.
L
www.national.com
13
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| LM3502SQ-35 | Step-Up Converter for White LED Applications |
| LM3502SQ-44 | Step-Up Converter for White LED Applications |
| LM3502SQX-16 | Step-Up Converter for White LED Applications |
| LM3502SQX-25 | Step-Up Converter for White LED Applications |
| LM3502ITL-35 | GT 4C 4#16S SKT PLUG RTANG |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM3502SQ-25/NOPB | 功能描述:LED照明驅(qū)動器 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 |
| LM3502SQ-35 | 功能描述:LED照明驅(qū)動器 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 |
| LM3502SQ-35/NOPB | 功能描述:LED照明驅(qū)動器 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 |
| LM3502SQ-44 | 功能描述:LED照明驅(qū)動器 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 |
| LM3502SQ-44/NOPB | 功能描述:LED照明驅(qū)動器 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 |
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