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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相機閃光燈驅(qū)動器 |
| 文件頁數(shù)： | 6/10頁 |
| 文件大?。?/td> | 143K |
| 代理商： | SP6685ERTR |
6
Date: 12/15/04
SP6685 Charge Pump LED Driver for Camera Flash Copyright 2004 Sipex Corporation
FUNCTIONAL DIAGRAM
The SP6685 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 SP6685 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 SP6685 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
sec,
and then SP6685 goes through a soft-start
mode designed to reduce inrush current.
The SP6685 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
SP6685 auto detects a dropout condition,
which is when the FB pin is below the
THEORY OF OPERATION
RSET BLOCK
6
RSET
RSET
V=
{
1.26V
RSET
}
x11.2kohms
+
-
1.25V
+
-
BG REF
RSET REF
RESISTOR
TAPS
50mV
4
FLASH
FLASH=1, S=1, RSET REF
FLASH=0, S=0, 50mV
1
0 s
MUX
2x1
FB REF
7
FB
SGN 8
FB
COM P
+
-
FB COMP
CLR
COUNTER
32 COUNT
ONE
SHOT
SET
DOMIANT
S
0
R
MODE SWITCH
0 =1X
1=2X
1
5
EN
VIN
135C ON
145C OFF
THERMAL FAULT
OVER TEMP COMP
CLK
CLK
2.4MHZ
CHARGE
PUMP
SWITCHES
PGND
C1
C2
VOUT
CLK
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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