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| 型号： | SP6686ER-L |
| 厂商： | Exar Corporation |
| 文件页数： | 8/12页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR BK/BT CHG/PMP 10DFN |
| 标准包装： | 121 |
| 拓扑： | PWM，降压（降压），升压（升压），切换式电容器（充电泵） |
| 输出数： | 1 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光，闪灯/白光 |
| 类型 - 次要： | 高亮度 LED（HBLED），白色 LED |
| 频率： | 2.4MHz |
| 电源电压： | 2.7 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-VFDFN 裸露焊盘 |
| 供应商设备封装： | 10-DFN（3x3） |
| 包装： | 散装 |
| 工作温度： | -40°C ~ 85°C |
| 其它名称： | 1016-1528-5 1016-1528-5-ND 1016-1680 SP6686ER-L-ND |
S P 6 6 8 6
4 0 0 m A B u c k / B o o s t C h a r g e P u m p L E D D r i v e r
THEORY OF OPERATION
The SP6686 is a charge pump regulator
designed for converting a Li-Ion battery
voltage of 2.7V to 4.2V to drive a white LED
used in digital still camera Flash and Torch
applications. The SP6686 has two modes of
operation which are pin selectable for either
Flash or Torch. Flash mode is usually used
with a pulse of about 200 to 300 milliseconds
to generate a high intensity Flash. Torch can
be used continuously at a lower output current
than Flash and is often used for several
seconds in a digital still camera “movie” mode.
The SP6686 also has two modes of operation
to control the output current, the 1x mode and
2x mode. Operation begins after the enable
pin EN receives a logic high, the bandgap
reference wakes up after 200 μ sec, and then
SP6686 goes through a soft-start mode
designed to reduce inrush current. The
SP6686 starts in the 1x mode, which acts like
a linear regulator to control the output current
by continuously monitoring the feedback pin
FB. In 1x mode, if the SP6686 auto detects a
dropout condition, which is when the FB pin is
below the regulation point for more than 32
cycles of the internal clock, the SP6686
automatically switches to the 2x mode. The
SP6686 remains in the 2x mode until one of
four things happens:
1) The enable pin EN has been toggled
2) The Flash pin has changed from high to low
3) V IN is cycled
4) 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
SP6686, which is internally limited to about
5.5V. 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 SP6686 FB pin
regulates to 50mV output:
50
When in Flash mode, (Flash = V IN ), the FB
regulation voltage is set by the resistor R SET
connected between the R SET pin and SGND and
the equation:
1.26
11.2 Ω
Where 1.26V is the internal bandgap reference
voltage and 11.2k Ω is an internal resistance
used to scale the R SET current. Typical values
of R SET are 40k Ω to 180k Ω for a range of V FB =
300mV to 75mV in Flash mode.
The output current is then set in either Flash
or Torch mode by the equation:
O VER T EMPERATURE P ROTECTION
When the temperature of the SP6686 rises
above 145°C, the over temperature protection
circuitry turns off the output switches to
prevent damage to the device. If the
temperature drops back down below 135°C,
the part automatically recovers and executes a
soft start cycle.
O VER V OLTAGE P ROTECTION
The SP6686 has over voltage protection. If the
output voltage rises above the 5.5V 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 5.5V, the device resumes
normal operation
O VER C URRENT P ROTECTION
The over current protection circuitry monitors
the average current out of the V OUT =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.
C OMPONENT S ELECTION
The SP6686 charge pump circuit requires 3
capacitors: 4.7 μ F input, 1 μ F output and
? 2009 Exar Corporation
8/12
Rev. 2.0.0
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SP6686ER-L/TR | 功能描述:LED照明驱动器 400mA Buck/Boost Charge Pump RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| SP6687 | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Evaluation Board Manual |
| SP6687_06 | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Evaluation Board Manual |
| SP6687EB | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Evaluation Board Manual |
| SP6687ER1-L | 制造商:Exar Corporation 功能描述:CHARGE PUMP LED DRIVER SMD 6687 |
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