參數(shù)資料
型號(hào)： SP7612
元件分類： LED驅(qū)動(dòng)器
英文描述： Low Dropout LED Driver for any Color LED
中文描述： 低壓差的LED彩色LED驅(qū)動(dòng)器的任何
文件頁(yè)數(shù)： 6/9頁(yè)
文件大?。?/td> 216K
代理商： SP7612
6
Date: 6/30/04
SP7611A/7612/7614 Low Dropout LED Driver for Any Color LED Copyright 2004 Sipex Corporation
Example 2: Drive high V
F
white or blue LEDs from
existing bus from 4.0V to 5.5V
High V
F
white or blue LEDs have forward voltage drop in
the range of 3.2V to 4.0V. To drive these LEDs with the
maximum current of 20mA for maximum brightness,
usually requires a boost circuit for a single cell Li-ion
voltage range. In some cases, there is already a voltage
bus in the system, which can be utilized. Due to the ultra-
low voltage drop of the SP761X series of LED drivers to
drive high V
F
white or blue LEDs. The V
IN
needs to be
only 300mV higher than the highest V
F
in the circuit.
APPLICATION INFORMATION
- T
DROP
< 0.3V
- V
F
(at 20mA) < 3.3V to 4.0V (High V
F
)
- V
IN
(at 20mA) = V
DROP
+V
F
= 3.6V to 4.3V
- V
IN
(at 5mA typical) ~ 3.3V
Where V
IN
= Existing bus = 3.3V to 4.3V
Key Advantages
1) No boost circuit needed for the LCD or keyboard
backlight
2) Drivers utilizes existing bus
3) Ultra-low voltage drop provides the full 20mA LED
current at the lowest possible voltage level.
Example 3: Drive white, blue red, amber LEDs string
Assuming boost circuit, or existing voltage bus, the
SP761X series of LED drivers can be used to drive a
whole string of LEDs and flexible brightness control -
analog and/or PWM.
- V
DROP
< 0.3V
- V
IN_MIN
= N x V
F
+ V
DROP
- V
IN_MIN
= N x V
F
+ 5.5V
Where V
IN
= Existing bus, boost Voltage
Key Advantages
1) No need for current matching resistors and discrete
transistor for brightness control
LED Brightness Control
All of the SP761X LED Drivers feature analog and PWM
controls to give designers flexible brightness control.
These control methods can be applied to the circuit in two
different ways, to provide more flexibility than any other
solution. To determine the value of R
SET
, use the "I
SET
vs.
V
CRTL
"
graph under the Typical Performance Character-
istics.
1. SP7611A
VIN
LED1
GND
CTRL
ON/OFF
ENABLE
VCONTROL 3V
RSET
SP7611
ISET
LED3
LED2
LED4
- Analog
Set V
CONTROL
and R
SET
for LED current
I
LED
= 200 x (V
CONTROL -
V
CNTR
)
/ R
SET
- PWM
V
CONTROL
= PWM
-Amplitude sets maximum LED current
-Pulse width controls between 0 and maximum
2. SP7612
VIN
LED1
GND
CTRL
ON/OFF
ENABLE
VCONTROL
RSET
SP7612
ISET
LED3
LED4
VIN
LED1
GND
CTRL
ON/OFF
ENABLE
VCONTROL
RSET
SP7611
ISET
LED3
LED2
LED4
VIN
LED1
GND
CTRL
ON/OFF
ENABLE
VCONTROL
RSET
SP7611
ISET
LED2
LED4
‘N’number of LEDs Per Branch
LED3
相關(guān)PDF資料
PDF描述
SP7612EC6 Low Dropout LED Driver for any Color LED
SP7648 Low Reference High Efficiency Boost Regulator
SP7648ER Low Reference High Efficiency Boost Regulator
SP7648EU Low Reference High Efficiency Boost Regulator
SP7648TR Low Reference High Efficiency Boost Regulator
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SP7612A 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:2-4 Channel Low Dropout Linear LED Driver
SP7612AEC6 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Low Dropout LED Driver for any Color LED
SP7612AEC6/TR 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Low Dropout LED Driver for any Color LED
SP7612AEC6-L 制造商:Rochester Electronics LLC 功能描述: 制造商:Exar Corporation 功能描述:LED DRIVER LOW DROPOUT SMD 7612
SP7612AEC6-L/TR 功能描述:LED照明驅(qū)動(dòng)器 LOW DROPOUT LED DRVR ANY COLOR W/ A SHUT 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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