- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄384605 > LP3954TLX (NATIONAL SEMICONDUCTOR CORP) Advanced Lighting Management Unit PDF資料下載
參數(shù)資料
| 型號： | LP3954TLX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 顯示驅(qū)動器 |
| 英文描述： | Advanced Lighting Management Unit |
| 中文描述： | LED DISPLAY DRIVER, PBGA36 |
| 封裝： | 3 X 3 MM, 0.60 MM HEIGHT, 0.50 MM PITCH, MICRO, SMD-36 |
| 文件頁數(shù)： | 23/56頁 |
| 文件大?。?/td> | 5801K |
| 代理商： | LP3954TLX |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁當(dāng)前第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁
Single High Current Driver
LP3954 has internal constant current driver that is capable for
driving high current mainly targeted for FLASH LED in camera
phone applications.
MAXIMUM CURRENT SETUP FOR FLASH
The user sets the maximum current of FLASH with R
FLASH
resistor based on following equation:
I
MAX
= 300 × 1.23V / (R
FLASH
+ 50),
where
Imax = maximum flash current in Amps (ie. 0.3A)
1.23V = reference voltage
300 = internal current mirror multiplier
R
FLASH
= Resistor value in Ohms
50
= Internal resistor in the I
FLASH
input
For example if 300mA is required for maximum flash current
R
FLASH
equals to
R
FLASH
= 300 × 1.23V / I
MAX
– 50
= 369V / 0.3A – 50
=
1.18k
CURRENT CONTROL FOR FLASH
To minimize the internal current consumption, the flash func-
tion has an enable bit EN_HCFLASH in the HC_Flash regis-
ter.
EN_
HCFLASH
0
FLASH disabled, no extra current
consumption through R
FLASH
1
FLASH enabled, IFLASH set by
HC_SW[1:0] (see below)
HC[1:0] bits in the HC_Flash register control the FLASH cur-
rent as show in following table.
HC[1:0]
00
I(FLASH)
0.25 × I
MAX(FLASH)
0.50 × I
MAX(FLASH)
0.75 × I
MAX(FLASH)
1.00 × I
MAX(FLASH)
01
10
11
The figure below shows the internal structure for the FLASH
driver.
20132233
FLASH TIMING
Flash output is turned on in lower current
View finder
mode
when the EN_HCFLASH bit is written high. The actual Flash
at maximum current starts when the EN_FLASH i/o-pin goes
high. The Flash length can be selected from 3 pre-defined
values or EN_FLASH pin pulse length can determine the
length. The pulse length is controlled by the FT_T[1:0] bits as
show in the table below.
FL_T[1:0]
Flash duration typ
Current during view finder/
focusing
Set by HC[1:0]
Current during FLASH
00
200ms
HC[11] = I
MAX(FLASH)
HC[11] = I
MAX(FLASH)
HC[11] = I
MAX(FLASH)
HC[11] = I
MAX(FLASH)
01
400ms
Set by HC[1:0]
10
600ms
Set by HC[1:0]
11
EN_FLASH on duration
Set by HC[1:0]
23
www.national.com
L
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LP3958 | Lighting Management Unit with High Voltage Boost Converter |
| LP3958TL | Lighting Management Unit with High Voltage Boost Converter |
| LP3958TLX | Lighting Management Unit with High Voltage Boost Converter |
| LP3971 | POWER MANAGEMENT UNIT FOR ADVANCED APPLICATION PROCESSORS |
| LP3971SQ-A514 | POWER MANAGEMENT UNIT FOR ADVANCED APPLICATION PROCESSORS |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LP3954TLX/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 |
| LP3958 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Lighting Management Unit with High Voltage Boost Converter |
| LP3958TL | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Lighting Management Unit with High Voltage Boost Converter |
| LP3958TL/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 |
| LP3958TLX | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Lighting Management Unit with High Voltage Boost Converter |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。