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TL4242 Datasheet(PDF) 6 Page - Texas Instruments |
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TL4242 Datasheet(HTML) 6 Page - Texas Instruments |
6 / 14 page APPLICATION INFORMATION 100 nF Q SI RO I GND RADJ D 10 µF 10 k Ω ST PWM GND D 47 nF Q REF VBAT RREF LED Dragon I Microcontroller 0.47 Ω 0.25 W TL4242 t STHL,typ + C D 47 nF 10 ms t STLH,typ + C D 47 nF 10 ms TL4242 SLVS641 – APRIL 2008 .................................................................................................................................................................................................... www.ti.com Figure 5 shows a typical application with the TL4242 LED driver. The three LEDs are driven by a supply current that is adjusted by the resistor, RREF, preventing brightness variations due to forward voltage spread of the LEDs. The luminosity spread arising from the LED production process can be compensated via software by an appropriate duty cycle applied to the PWM pin. Therefore, it is not necessary to select LEDs for forward voltage or luminosity classes. The minimum supply voltage calculates as the sum of the LED forward voltages, the TL4242 drop voltage (maximum 0.7 V at a LED current of 300 mA) and the maximum voltage drop at the shunt resistor RREF of 185 mV (max). Figure 5. Application Circuit The status output of the LED driver (ST) detects an open-load condition, enabling supervision of correct LED operation. An LED failure is detected as a voltage drop at the shunt resistor (RREF) below 25 mV (typ). In this case, the status output pin (ST) is set low after a delay time adjustable by an optional capacitor connected to pin D. The functionality and timing of ST and PWM are shown in Figure 6. The status delay can be adjusted via the capacitor connected to pin D. Delay time scales linearly with capacitance, CD: 6 Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated |
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