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TLE4242G Datasheet(PDF) 4 Page - Infineon Technologies AG |
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TLE4242G Datasheet(HTML) 4 Page - Infineon Technologies AG |
4 / 14 page Data Sheet 4 Rev. 1.1, 2007-03-20 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 Ω µC TLE 4242 G V BAT I I 47 nF GND D ST PWM Q 0.47 Ω 0.25 W R REF LED Dragon REF |
Similar Part No. - TLE4242G_07 |
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Similar Description - TLE4242G_07 |
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