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參數(shù)資料
| 型號： | MLX10803_05 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Automotive high power LED driver |
| 中文描述： | 汽車等功率LED驅動器 |
| 文件頁數(shù)： | 19/25頁 |
| 文件大?。?/td> | 866K |
| 代理商： | MLX10803_05 |
IC specification
MLX10803
Automotive high power LED driver
3901010803 Page 19/25
Rev 018 28/SEP/05
Author:
ALX, VAR
revised: TFR/VAR
Conclusion:
In most cases the coil is driven in a combination of both ways. A trade off has to be made between
EMI behaviour and maximum allowed LED current. By varying these parameters, an optimum can
be found for every application.
Below are some examples for typical parameter sets given for a 4A LED current and the following
application data:
RSENSE = 0.1R / 2 watt
ROSC = 270K
L = 47μH, 4A minimum, 0.05
Normal nFET switch transistor, rds on < 0,01
Remarks:
4A and 0.05
results in 0.8 watt power dissipation over the coil.
4A and 0.1
for the RSENSE resistor results in 1.6 watt, but only for 50% of the time in average.
The LED(s) with this current will dissipate 32 watt if they have 8V forward voltage.
I
t
Imax1
Iavg
Toff
Coil 1
Imax2
Coil 2
Resistance 2
Resistance 1
Coil 1 > Coil 2
Resistance 1 > Resistance 2
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