- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄376180 > MLX10803KDC (Electronic Theatre Controls, Inc.) High power LED driver PDF資料下載
參數(shù)資料
| 型號： | MLX10803KDC |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | High power LED driver |
| 中文描述： | 高功率LED驅(qū)動器 |
| 文件頁數(shù)： | 16/25頁 |
| 文件大?。?/td> | 479K |
| 代理商： | MLX10803KDC |
IC specification
MLX10803
High power LED driver
3901010803 Page 16/25
Data Sheet
Rev 025 2/OCT/07
7.
LED driving principle
7.1.
General
The LED is driven by a switched mode power supply using an inductor as the energy storage element. This method
has several advantages. The supply voltage has to be set down to the forward bias voltage of the LED. In ordinary
applications this is achieved by a resistor with the following drawbacks:
-
A resistor dissipates power which is transformed to heat
-
Efficiency is reduced drastically
-
The light output of the LED is dependent on the supply and the temperature of the resistor
The MLX10803 avoids these disadvantages as shown by the following calculation with L=220μH, R
SENSE
= 0.1
:
Supposed:
V
bat
= 13.8V
V
fLED
≈
3.4V
example 1
; 8V
example2
;
I
fLED
≈
4A
V
f1
≈
0.9V (reverse polarity diode)
V
f2
≈
0.9V (free wheel diode)
V
RSENSE
≈
0.4V (@I
fLED
, R
SENSE
=0.1
)
V
RDS ON
≈
0.04V (@I
fLED
)
V
Coil
≈
0.2V (@I
fLED
)
Efficiency using a simple resistor or load dump regulation:
V
n
example1
;
58
≈
Efficiency n:
%
29
≈
=
BAT
fLED
V
%
example2
;
Efficiency using the MLX10803:
The following calculation is an approximation only, due to the fact that coil current is not constant. It is therefore
calculated with average currents.
1) During OFF time, the coil acts as the storage element and delivers its energy to the flyback diode
and the LED:
V
n
example1
;
%
88
≈
%
75
2
1
≈
+
+
=
Coil
f
fLED
fLED
V
V
V
example 2;
2) During ON time, current flows through the reverse polarity diode, LED, coil , FET driver and RSENSE,
which causes the following voltage drops:
V
n
%
69
1
2
≈
+
+
+
+
=
RSENSE
RDSon
Coil
f
fLED
fLED
V
V
V
V
V
example1
;
%
84
≈
example 2
;
3) ON and OFF times are in ratio of roughly 30:70 for example 1 and 65:35 for example 2:
Efficiency n:
%
73
3
7
2
1
≈
+
=
n
n
n
example1
;
%
87
≈
example2
;
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MLX90110 | 128bit OTP/RW Transponder |
| MLX90111 | 128bit Read Write Transponder |
| MLX90217 | Hall-Effect Cam Sensor |
| MLX90240 | Pressure Sensor IC |
| MLX90242LUA-CC03 | Linear Hall Effect Sensor |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MLX10803KDC-AAA-000-RE | 功能描述:IC LED DRVR HP CONST CURR 8-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - LED 驅(qū)動器 系列:- 標準包裝:1 系列:- 恒定電流:- 恒定電壓:- 拓撲:PWM，切換式電容器（充電泵） 輸出數(shù):1 內(nèi)部驅(qū)動器:是 類型 - 主要:背光 類型 - 次要:白色 LED 頻率:642kHz 電源電壓:2.7 V ~ 5.5 V 輸出電壓:5V 安裝類型:表面貼裝 封裝/外殼:10-VFDFN 裸露焊盤 供應商設備封裝:10-VSON 包裝:剪切帶 (CT) 工作溫度:-30°C ~ 85°C 產(chǎn)品目錄頁面:1371 (CN2011-ZH PDF) 其它名稱:BD1603NUV-E2CT |
| MLX10803KDC-AAA-000-TU | 制造商:Melexis Semiconductors 功能描述:IC LED DRIVER HP 8SOIC |
| MLX10803KDC-TR-7 | 制造商:Melexis Semiconductors 功能描述: |
| MLX12101 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Sensor Protection IC |
| MLX12101E | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Sensor Protection IC |
發(fā)布緊急采購，3分鐘左右您將得到回復。