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参数资料
| 型号： | SP7685ER-L |
| 厂商： | Exar Corporation |
| 文件页数： | 4/12页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR PWM DIMMING 10DFN |
| 标准包装： | 1 |
| 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： | 1016-1406 |
FUNCTIONAL DIAGRAM
{ }
RSET 6
RSET BLOCK
+
-
RSET
R SET
R SET REF= x 14 μ A
5
BG REF
+
- 1.26V
RSET REF
RESISTOR
TAPS
1
MUX
2x1
50mV 0 s
FB REF
FB 7
SGND 8
+
FB
COM P
-
FB COMP
ONE
SHOT
CLK
COUNTER
32 COUNT
CLR
SET
DOMINANT
S
0
R
FLASH 4
FLASH=1, S=1, RSET REF
EN 5
FLASH=0, S=0, 50mV
VIN 1
MODE SWITCH
0 =1X
1=2X
135C ON
THERMAL FAULT
145C OFF
2.4MH Z
OVER TEMP COMP
CLK
CHARGE
PUMP
SWITCHES
C1
C2
VOUT
CLK
PGND
THEORY OF OPERATION
The SP7685 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 SP7685 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 SP7685 also has two modes of opera-
tion 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 s,
and then SP7685 goes through a soft-start
mode designed to reduce inrush current.
The SP7685 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
SP7685 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 SP7685 automati-
cally switches to the 2X mode. The SP7685
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 or, 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 volt-
age for the SP7685, 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.
Date: 6/20/06 Rev T
SP7685, 1.2A Buck/BoostCharge Pump LED Driver
4
? 2006 Sipex Corporation
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SP7685ER-L/TR | 功能描述:LED照明驱动器 1.2A BUCK/BOOST LED DRVR 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 |
| SP7686 | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Constant Current Flash Driver in DFN 2mm x 3mm |
| SP7686A | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Constant Current Flash Driver in DFN 2mm x 3mm |
| SP7686A_07 | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Evaluation Board Manual |
| SP7686AEB | 功能描述:电源管理IC开发工具 500mA Programmable Charge Pump LED Drvr RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
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