參數(shù)資料
型號(hào)： MLX10803_05
廠商： Electronic Theatre Controls, Inc.
英文描述： Automotive high power LED driver
中文描述： 汽車(chē)等功率LED驅(qū)動(dòng)器
文件頁(yè)數(shù)： 16/25頁(yè)
文件大?。?/td> 866K
代理商： MLX10803_05
IC specification
MLX10803
Automotive high power LED driver
3901010803 Page 16/25
Rev 018 28/SEP/05
Author:
ALX, VAR
revised: TFR/VAR
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
= 0.1R:
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 the 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
≈
example 2;
%
75
2
1
≈
+
+
=
Coil
f
fLED
fLED
V
V
V
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:
3
7
2
1
+
=
n
n
n
%
2
73
≈
example1
;
%
6
86
≈
example2
;
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