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參數(shù)資料
| 型號： | SP6685ERTR |
| 元件分類： | LED驅(qū)動器 |
| 英文描述： | Charge Pump LED Driver For Camera Flash |
| 中文描述： | 電荷泵的LED相機(jī)閃光燈驅(qū)動器 |
| 文件頁數(shù)： | 7/10頁 |
| 文件大?。?/td> | 143K |
| 代理商： | SP6685ERTR |
7
Date: 12/15/04
SP6685 Charge Pump LED Driver for Camera Flash Copyright 2004 Sipex Corporation
regulation point for more than 32 cycles of
the internal clock, the SP6685 automati-
cally switches to the 2X mode. The SP6685
remains in the 2X mode until one of four
things happens: the enable pin EN has
been toggled, the Flash pin has changed
from high to low, V
IN
is cycled or a thermal
fault occurs. The 2X mode is the charge
pump mode where the output can be pumped
as high as two times the input voltage,
provided the output does not exceed the
maximum voltage for the SP6685, which is
internally limited to about 4.3V. In the 2X
mode, as in the 1X mode, the output current
is regulated by the voltage at the FB pin.
In the Torch mode, (Flash = GND) the Flash
pin is set to logic low and the SP6685 FB pin
regulates to 50mV output:
V
FB
= 50mV (Torch Mode)
THEORY OF OPERATION
When in Flash mode, (Flash = V
), the FB
regulation voltage is set by the resistor R
SET
connected between the R
SET
pin and S
GND
and the equation:
V
FB
= (1.26V/ R
SET
)*11.2K
(Flash Mode)
Where 1.26V is the internal bandgap refer-
ence voltage and 11.2K
is an internal
resistance used to scale the R
current.
Typical values of R
are 100K to 500K for
a range of V
FB
= 150mV to 30mV in Flash
mode.
The output current is then set in either Flash
or Torch mode by the equation:
I
OUT
= V
FB
/ R
SENSE
OVERTEMPERATURE PROTECTION
OVERVOLTAGE PROTECTION
OVERCURRENT PROTECTION
When the temperature of the SP6685 rises above 145 degrees Celsius, the over temperature
protection circuitry turns off the output switches to prevent damage to the device. If the
temperature drops back down below 135 degrees Celsius, the part automatically recovers
and executes a soft start cycle.
The SP6685 has over voltage protection. If the output voltage rises above the 4.3V threshold,
the over voltage protection shuts off all of the output switches to prevent the output voltage
from rising further. When the output decreases below 4.3V, the device resumes normal
operation
The over current protection circuitry monitors the average current out of the V
= 50mV
(Torch Mode) pin. If the average output current exceeds approximately 1Amp, then the over
current protection circuitry shuts off the output switches to protect the chip.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SP6685 | Charge Pump LED Driver For Camera Flash |
| SP6685ER | Charge Pump LED Driver For Camera Flash |
| SP6690 | Micro Power Boost Regulator Series White LED Driver |
| SP6690EB | Evaluation Board Manual |
| SP6690EK | Micro Power Boost Regulator Series White LED Driver |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SP6686 | 制造商:EXAR 制造商全稱:EXAR 功能描述:400mA Buck/Boost Charge Pump LED Driver |
| SP6686EB | 功能描述:LED 照明開發(fā)工具 Eval Board for SP6686 Series RoHS:否 制造商:Fairchild Semiconductor 產(chǎn)品:Evaluation Kits 用于:FL7732 核心: 電源電壓:120V 系列: 封裝: |
| SP6686ER | 制造商:Exar Corporation 功能描述:Driver, Other |
| SP6686ER-L | 功能描述:LED照明驅(qū)動器 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 |
| SP6686ER-L/TR | 功能描述:LED照明驅(qū)動器 400mA Buck/Boost Charge Pump 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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