- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄380762 > STCF03 (意法半導(dǎo)體) High power white LED driver with I2C⑩ interface PDF資料下載
參數(shù)資料
| 型號： | STCF03 |
| 廠商： | 意法半導(dǎo)體 |
| 元件分類： | LED驅(qū)動(dòng)器 |
| 英文描述： | High power white LED driver with I2C⑩ interface |
| 中文描述： | 大功率白光LED驅(qū)動(dòng)器具有I2C⑩接口 |
| 文件頁數(shù)： | 13/35頁 |
| 文件大小： | 455K |
| 代理商： | STCF03 |
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頁當(dāng)前第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
Introduction
STCF03
13/35
7
Introduction
The STCF03 is a buck-boost converter, dedicated to power and control the current of a
Power White LED in a camera cell phone. The device operates at a constant switching
frequency of 1.8 MHz typ. It provides an output voltage down to 2.5 V and up to 5.3 V, from
a 2.7 V to 5.5 V supply voltage. This supply range allows operation from a single cell
Lithium-Ion battery. The I
2
C bus is used to control the device operation and for diagnostic
purposes. The current in Torch mode is adjustable from 15 mA to 200 mA. Flash mode
current is adjustable up to 800 mA, BGA version is able to deliver 600 mA at battery range
2.7 V to 3.3 V. The Aux LED current can be adjusted from 0 to 20 mA. The device uses an
external NTC resistor to sense the temperature of the white LED. These two last functions
may not be needed in all applications, and in these cases the relevant external components
can be omitted.
7.1
Buck-Boost converter
The regulation of the PWM controller is done by sensing the current of the LED through
external sensing resistors (R
FL
and R
TR
, see application schematic). Depending on the
forward voltage of the Flash LED, the device automatically can change the operation mode
between buck (step down) and boost (step up) mode.
Three cases can occur: Boost region (V
O
> V
BAT
): this configuration is used in most of the
cases, as the output voltage V
O
= V
fLED
+ I
LED
x RFL) is higher than V
BAT
; Buck region (V
O
< V
BAT
); Buck / Boost region (V
O
~ V
BAT
).
7.2
Logic pin description
7.2.1
SCL, SDA pins
These are the standard Clock and Data pins as defined in the I
2
C bus specification. External
pull-up is required according to I
2
C bus specifications. The recommended maximum voltage
of these signals should be 3.0 V.
7.2.2
TRIG pin
This input pin is internally AND-ed with the TRIG_EN bit to generate the internal signal that
activates the flash operation. This gives to the user the possibility to accurately control the
flash duration using a dedicated pin, avoiding the I
2
C bus latencies (hard-triggering). No
internal pull-up nor pull-down is provided.
7.2.3
ATN pin
This output pin (open-drain, active LOW) is provided to better manage the information
transfer from the STCF03 to the μP. Because of the limitations of a Single Master I
2
C bus
configuration, the μP should regularly poll the STCF03 to verify if certain operations have
been completed, or to check diagnostic information. Alternatively, the μP can use the ATN
pin to be advised that new data are available in the STAT_REG, thus avoiding continuous
polling. Then the information can be read in the STAT_REG by a read operation via I
2
C that,
besides, automatically resets the ATN pin. The STAT_REG bits affecting the ATN pin status
are mapped in
Table 16
. No internal pull-up is provided.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| STCF03PNR | High power white LED driver with I2C⑩ interface |
| STCF03TBR | High power white LED driver with I2C⑩ interface |
| STCN75 | Digital temperature sensor and thermal watchdog |
| STCN75DS2E | Digital temperature sensor and thermal watchdog |
| STCN75DS2F | Digital temperature sensor and thermal watchdog |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| STCF03I | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:High power white LED driver with IC interface |
| STCF03I_08 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:High power white LED driver with IC interface |
| STCF03ITBR | 功能描述:LED照明驅(qū)動(dòng)器 HP white LED driver 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 |
| STCF03PNR | 功能描述:LED照明驅(qū)動(dòng)器 Hi Pwr white LED Driver 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 |
| STCF03TBR | 功能描述:LED照明驅(qū)動(dòng)器 HP white LED driver 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 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。