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參數(shù)資料
| 型號： | SP6685ER |
| 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： | SP6685ER |
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 |
|---|---|
| SP6690 | Micro Power Boost Regulator Series White LED Driver |
| SP6690EB | Evaluation Board Manual |
| SP6690EK | Micro Power Boost Regulator Series White LED Driver |
| SP6690ER | Micro Power Boost Regulator Series White LED Driver |
| SP6690EU | Evaluation Board Manual |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SP6685ER/TR | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:700mA Buck/Boost Charge Pump LED Driver |
| SP6685ER-L | 功能描述:電荷泵 Camera Flash RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube |
| SP6685ER-L/TR | 功能描述:電荷泵 700mA For Camera Flash RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube |
| SP6685ERTR | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Charge Pump LED Driver For Camera Flash |
| SP6686 | 制造商:EXAR 制造商全稱:EXAR 功能描述:400mA Buck/Boost Charge Pump LED Driver |
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