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參數(shù)資料
| 型號(hào)： | SP6683EU |
| 元件分類： | LED驅(qū)動(dòng)器 |
| 英文描述： | High Power LED Driver for Parallel Configuration |
| 中文描述： | 大功率并聯(lián)配置驅(qū)動(dòng)程序 |
| 文件頁(yè)數(shù)： | 6/10頁(yè) |
| 文件大?。?/td> | 200K |
| 代理商： | SP6683EU |
6
Date: 07/07/04
SP6683 White LEDs Driver for Parallel Configuration Copyright 2004 Sipex Corporation
Capacitor Selection
Ceramic capacitors are recommended for their
inherently low ESR, which will help produce
low peak to peak output ripple, and reduce high
frequency spikes.
The fly capacitor controls the strength of the
charge pump. Selection of the fly capacitor is a
trade-off between the output voltage ripple and
the output current capability. Decreasing the fly
capacitor will reduce the output voltage ripple
because less charge will be delivered to the
output capacitor. However, smaller fly capaci-
tor leads to larger output resistance, thus de-
creasing the output current capability and the
circuit efficiency. Place all the capacitors as
close to the SP6683 as possible for layout.
Increasing the value of the input and otput
capicitors could further reduce the input and
output ripple.
Refer to table 1 for some suggested low ESR
capicitors.
PROGRAMMING THE OPERATING MODE
SP6683 can automatically change from X1 mode
to X1.5 mode for highest efficiency. To use this
feature, divider resistors should be chosen ac-
cording to the specific application, as shown in
figure 13.
V
IN
V
IN
C2
GND
4
V
MODE
R1
SP6683
8
R2
3
Figure 13. Programming the Vmode Resistors
The guideline for divider resistor selections is as
follows. For high input voltage, the SP6683 will
work in X1 mode. When the input voltage drops
to Vth threshold voltage, it will switch to X1.5
mode automatically. The Vth threshold voltage
for mode change can be calculated by:
V
TH
= (V
F
+ 0.306 + m I
LED
R
OUT
)
Where V
F
and m are the forward voltage and
number of the white LEDs, Rout is the output
resistance of the SP6683.
The equation for the voltage divider R
1
and R
2
with V
MODE
= 1.25V is:
V
TH
= 1.25V (1+R
1
/R
2
)
Table: 1
APPLICATION INFORMATION
For the typical SP6683 application, using V
F
=
3.6V, m = 8, I
LED
=
15mA, R
OUT
= 6
, V
TH
will
be 4.63V, Select R
2
= 100k
, then R
1
= 270k
Which can be expressed as R
1:
R
1
= V
TH/
1.25
-
1)
R
2
MANUFACTURERS/
TELEPHONE#
PART NUMBER
CAPACITANCE/
VOLTAGE
CAPACITOR/
SIZE/TYPE
ESR
AT 100kHz
TDK/847-803-6100
C2012X5R1A225K
2.2
μ
F/10V
0805/X5R
0.030
TDK/847-803-6100
C2012X5R0J475K
4.7
μ
F/6.3V
0805/X5R
0.020
MURATA/770-436-1300
GRM188R60J225KE01D
2.2
μ
F/6.3V
0603/X5R
0.030
MURATA/770-436-1300
GRM219R60J475KE01D
4.7
μ
F/6.3V
0805/X5R
0.020
SUGGESTED LOW ESR CAPACITORS
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SP6683EU/TR | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:High Power LED Driver for Parallel Configuration |
| SP6683UEB | 功能描述:LED 照明開(kāi)發(fā)工具 High Power LED Drvr for Parallel Config 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: |
| SP6685 | 制造商:EXAR 制造商全稱:EXAR 功能描述:700mA Buck/Boost Charge Pump LED Driver |
| SP6685_06 | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:700mA Buck/Boost Charge Pump LED Driver |
| SP6685EB | 功能描述:電源管理IC開(kāi)發(fā)工具 Eval Board for SP6685 Series RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
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