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參數(shù)資料
| 型號： | LP3933 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Lighting Management System for Six White LEDs and Two RGB or FLASH LEDs |
| 中文描述： | 照明管理系統(tǒng)6個白光LED和RGB或兩個閃光LED |
| 文件頁數(shù)： | 8/18頁 |
| 文件大?。?/td> | 406K |
| 代理商： | LP3933 |
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
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相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LP3933SL | Lighting Management System for Six White LEDs and Two RGB or FLASH LEDs |
| LP3933SLX | Lighting Management System for Six White LEDs and Two RGB or FLASH LEDs |
| LP3936 | Lighting Management System for Six White LEDs and One RGB or FLASH LED |
| LP3936SL | Lighting Management System for Six White LEDs and One RGB or FLASH LED |
| LP3936SLX | Lighting Management System for Six White LEDs and One RGB or FLASH LED |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LP3933A WAF | 制造商:Texas Instruments 功能描述: |
| LP3933SL | 制造商:Texas Instruments 功能描述:LIGHTING MANAGEMENT IC POWERWISE |
| LP3933SL/NOPB | 功能描述:IC LED DRVR WT/RGB BCKLGT 32TCSP RoHS:是 類別:集成電路 (IC) >> PMIC - LED 驅(qū)動器 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 恒定電流:- 恒定電壓:- 拓?fù)?PWM，切換式電容器（充電泵） 輸出數(shù):1 內(nèi)部驅(qū)動器:是 類型 - 主要:背光 類型 - 次要:白色 LED 頻率:642kHz 電源電壓:2.7 V ~ 5.5 V 輸出電壓:5V 安裝類型:表面貼裝 封裝/外殼:10-VFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:10-VSON 包裝:剪切帶 (CT) 工作溫度:-30°C ~ 85°C 產(chǎn)品目錄頁面:1371 (CN2011-ZH PDF) 其它名稱:BD1603NUV-E2CT |
| LP3933SLX | 功能描述:IC LED DRVR WT/RGB BCKLGT 32TCSP RoHS:否 類別:集成電路 (IC) >> PMIC - LED 驅(qū)動器 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 恒定電流:- 恒定電壓:- 拓?fù)?PWM，切換式電容器（充電泵） 輸出數(shù):1 內(nèi)部驅(qū)動器:是 類型 - 主要:背光 類型 - 次要:白色 LED 頻率:642kHz 電源電壓:2.7 V ~ 5.5 V 輸出電壓:5V 安裝類型:表面貼裝 封裝/外殼:10-VFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:10-VSON 包裝:剪切帶 (CT) 工作溫度:-30°C ~ 85°C 產(chǎn)品目錄頁面:1371 (CN2011-ZH PDF) 其它名稱:BD1603NUV-E2CT |
| 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 |
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