Car LED light
driver circuit diagram
The MLX10803 evaluation board
circuit diagram was designed to provide an easy solution for
demonstrating the use of high brightness car LEDs light in
conjunction with the MLX10803 LED driver chip. It is suitable to be
driven under car supply conditions (12V board systems) and is
optimized in terms of electromagnetic emission behaviour to be able
to fulfill automotive standards. If good emission behaviour is not
an issue (e.g. industrial/consumer applications), smaller caps (for
C1/C2) as well as an unshielded coil can be used. Thus, size and
cost can be reduced once more.
For normal operation only a few
connections are necessary. The supply line VBAT must be connected to
any standard DC supply. The input voltage should always be about 2V
higher then the sum of all LED forward voltages in order to keep the
regulator working. The supply must be able to drive the peak LED
current that is defined with the IREF2 potentiometer. The LED(s) is
(are) connected to the board via a polarised plug to avoid incorrect
connection.
LED(s): - all High Brightness LEDs, e.g.:
Lumileds Luxeon®
, Lumileds Luxeon III
Cree XLamp™ 3
7090 series, Cree XLamp™ 7090 series
OSRAM (Advanced)
Power TOPLED®
, OSRAM Golden Dragon®
Nichia POWER LED Series
Download Source: Evaluation board EVB10803
Power LED driver for automotive applications www.melexis.com
12V or 24V in DC Constant Current Car LED
Driver circuit diagram
ON Semiconductor’s latest
monolithic NCV51411 (CS51411) converter is to be used in a buck
topology optimized to drive a single car LED at a constant current
between 350 mA to 1 Amp. A high side, low drop, current sensing
scheme has been implemented, targeted for car automotive and other high
efficiency applications. DCR Inductor current sensing is used to
generate the control ramp required for the V2 controller.
This design note targets a constant
current (350mA to 1 A) driver suitable for driving a single car LED (1
watt or 3 watts) from a nominal 12 V or 24 V dc source. The output
voltage range assumes a single White/Blue/Green LED with a forward
voltage of 3.6 +/- 35%.
Source: ON Semiconductor
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