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參數(shù)資料
| 型號(hào)： | LP3933SLX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 顯示驅(qū)動(dòng)器 |
| 英文描述： | Lighting Management System for Six White LEDs and Two RGB or FLASH LEDs |
| 中文描述： | LED DISPLAY DRIVER, QCC32 |
| 封裝： | 4.50 X 5.50 MM, 0.80 MM HEIGHT, 0.50 MM PITCH, CSP-32 |
| 文件頁(yè)數(shù)： | 8/18頁(yè) |
| 文件大?。?/td> | 406K |
| 代理商： | LP3933SLX |
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SPI Interface
(Continued)
20080513
SPI Timing Diagram
SPI Timing Parameters
V
DD1,2
= V
DD_IO
= 2.775V
Symbol
Parameter
Limit
Units
Min
70
35
35
35
35
0
20
Max
1
2
3
4
5
6
7
8
9
10
11
12
Cycle Time
Enable Lead Time
Enable Lag Time
Clock Low Time
Clock High Time
Data Setup Time
Data Hold Time
Data Access Time
Output Disable Time
Output Data Valid
Output Data Hold Time
SS Inactive Time
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
20
10
20
0
10
Note:
Data guaranteed by design.
Magnetic Boost DC/DC Converter
The LP3933 boost DC/DC Converter generates 4.1V–5.3V supply voltage for the LEDs from single Li-Ion battery (3V…4.5V). The
output voltage is controlled with 8-bit register in 9 steps. The converter is a magnetic switching PWM mode DC/DC converter with
a current limit. The converter has 1 MHz switching frequency when timing resistor RT is 82 K
.
The topology of the magnetic boost converter is called CPM control, current programmed mode, where the inductor current is
measured and controlled with the feedback. The user can program the output voltage of the boost converter. The control changes
the resistor divider in the feedback loop.
The following figure shows the boost topology with the protection circuitry. Three different protection schemes are implemented:
1.
Over voltage protection, limits the maximum output voltage
— Keeps the output below breakdown voltage.
— Prevents boost operation if battery voltage is much higher than desired output.
2.
Over current protection, limits the maximum inductor current
— Voltage over switching NMOS is monitored, too high voltages turn the switch off.
3.
Duty cycle limiting, done with digital control.
L
www.national.com
8
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| LP3936SLX | Lighting Management System for Six White LEDs and One RGB or FLASH LED |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LP3936 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Lighting Management System for Six White LEDs and One RGB or FLASH LED |
| LP3936SL | 功能描述:LED照明驅(qū)動(dòng)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 |
| LP3936SL/NOPB | 功能描述:LED照明驅(qū)動(dòng)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 |
| LP3936SLX | 功能描述:LED照明驅(qū)動(dòng)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 |
| LP3936SLX/NOPB | 功能描述:LED照明驅(qū)動(dòng)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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