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TLE4242G Datasheet(PDF) 4 Page - Infineon Technologies AG

Part # TLE4242G
Description  Adjustable LED Driver
PDF  13 Pages
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Manufacturer  INFINEON [Infineon Technologies AG]
Direct Link  http://www.infineon.com
Logo INFINEON - Infineon Technologies AG

TLE4242G Datasheet(HTML) 4 Page - Infineon Technologies AG

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Data Sheet
4
Rev. 1.0, 2004-01-01
TLE 4242 G
Application Information
Figure 3
Application Circuit
Figure 3 shows a typical application with the TLE 4242 G LED driver. The 3 LEDs are
driven with an adequate supply current adjusted by the resistor
R
REF. Thus brightness
variations due to forward voltage spread of the LEDs are prevented. The luminosity
spread arising from the LED production process can be compensated via software by an
appropriate duty cycle applied to the PWM pin. Hence selection of the LEDs to forward
voltage as well as to luminosity classes can be spared. The minimum supply voltage
calculates as the sum of the LED forward voltages, the TLE 4242 G drop voltage (max.
0.7 V at a LED current of 300 mA) and the max. voltage drop at the shunt resistor
R
REF
of max. 185 mV.
The status output of the LED driver (ST) detects an open load condition enabling to
supervise correct LED function. A LED failure is detected if the voltage drop at the shunt
resistor
R
REF falls below typ. 25 mV. In this case the status output pin ST is set low after
a delay time adjustable via an optional capacitor connected to the pin D.
AEA03499.VSD
TLE 4269 G
100
nF
GND
D
RADJ
SI
Q
RO
10
µF
10 k
µC
TLE 4242 G
V
BAT
I
I
47 nF
GND
D
ST
PWM
Q
0.47
0.25 W
R
REF
LED
Dragon
REF


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