參數(shù)資料
型號(hào)： SP7614C6
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： SP7614C6
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
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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SP7614EC6 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Low Dropout LED Driver for any Color LED
SP7614EC6/TR 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Low Dropout LED Driver for any Color LED
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