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參數(shù)資料
| 型號(hào)： | SP6682UEB |
| 英文描述： | Evaluation Board Manual |
| 中文描述： | 評(píng)估板手冊(cè) |
| 文件頁(yè)數(shù)： | 6/12頁(yè) |
| 文件大?。?/td> | 190K |
| 代理商： | SP6682UEB |
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(guān)PDF資料 |
PDF描述 |
|---|---|
| SP6683 | High Power LED Driver for Parallel Configuration |
| SP6683ER | High Power LED Driver for Parallel Configuration |
| SP6683EU | High Power LED Driver for Parallel Configuration |
| SP6685ERTR | Charge Pump LED Driver For Camera Flash |
| SP6685 | Charge Pump LED Driver For Camera Flash |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SP6683 | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:High Power LED Driver for Parallel Configuration |
| SP6683EB | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Evaluation Board Manual |
| SP6683ER | 制造商:Exar Corporation 功能描述:Driver, Other |
| SP6683ER/TR | 功能描述:LED照明驅(qū)動(dòng)器 High Power Parallel Configuration 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 |
| SP6683ER-L | 功能描述:LED照明驅(qū)動(dòng)器 Configuration 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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