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參數(shù)資料
| 型號： | SP6682ER |
| 英文描述： | High Efficiency Charge Pump Regulator for White LEDs |
| 中文描述： | 高效電荷泵調節(jié)器白光LED |
| 文件頁數(shù)： | 6/12頁 |
| 文件大?。?/td> | 190K |
| 代理商： | SP6682ER |
6
Date: 5/5/04
SP6682 High Efficiency Charge Pump Regulator for White LEDs Copyright 2004 Sipex Corporation
encing high input voltages. Another important
operation of this block is the PWM/EN dim-
ming control, which is implemented in the delay
of each pump driver, so that the enable high
pulse width is proportional to the delay of the
individual pump switches.
5) V
OUT
Comparator and Output Control.
A
306mV reference voltage is compared to feed-
1
8
5
Rb
SP6682
Rb
2.2uF
GND
FB
V
OUT
Figure 9. Driving discrete white LEDs as current source
Configuring the SP6682 as Voltage or
Current Source
The white LED load configuration used by
customers can be discrete white LEDs or a white
LED module. Inside the white LED module,
there may or may not be resistors in series with
the white LEDs. According to the different
application requirements, the SP6682 can be
configured as either a voltage source or a current
source to provide solutions for these different
applications, as shown in figure 9~12. Figure 9
shows using the SP6682 to drive discrete white
LEDs as a current source.
The current in one white LED current is set by
the ratio of the feedback pin voltage (306mV)
and the bias resistor R
B
. To set the operating
current, R
B
can be selected by:
R
B
= V
FB
I
LED
3-wire W-LED module
Anode
FB
GND
Fig 10. 3-wire white LED module
The current of the remaining white LEDs is set
according to the similarity of the white LEDs. 3-
wire white LED module with internal series
resistors as shown in figure 10 can also be driven
in this way.
GND
V
OUT
Anode
5
V
FB
Rb
SP6682
Cathode
8
2-wire W-LED module
1
Figure 11. Driving 2-wire white LED module as current
source
OPERATION: Continued
back output voltage to control the Vout needed
for the application. Output current is set by a
bias resistor from FB pin to GND pin chosen by
the relationship:
I
OUT
= V
FB
R
FB
where V
FB
= 306mV.
In figure 11, SP6682 was used to drive a 2-wire
white LED module without internal series resis-
tors as a current source. The bias resistor R
B
is
selected to regulate the total current of the white
LED module instead of the current of single
LED as in figure 9.
APPLICATION INFORMATION
相關PDF資料 |
PDF描述 |
|---|---|
| SP6682EU | High Efficiency Charge Pump Regulator for White LEDs |
| SP6682UEB | Evaluation Board Manual |
| SP6683 | High Power LED Driver for Parallel Configuration |
| SP6683ER | High Power LED Driver for Parallel Configuration |
| SP6683EU | High Power LED Driver for Parallel Configuration |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| SP6682ER/TR | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:High Efficiency Charge Pump Regulator for White LEDs |
| SP6682ER-L | 功能描述:電荷泵 White LEDs 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 |
| SP6682ER-L/TR | 功能描述:電荷泵 High Efficiency for White LEDs 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 |
| SP6682EU | 制造商:Exar Corporation 功能描述:Driver, Other |
| SP6682EU/TR | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:High Efficiency Charge Pump Regulator for White LEDs |
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