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TL4242 Datasheet(PDF) 6 Page - Texas Instruments

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No. de pieza TL4242
Descripción Electrónicos  ADJUSTABLE LED DRIVER
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Fabricante Electrónico  TI [Texas Instruments]
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TL4242 Datasheet(HTML) 6 Page - Texas Instruments

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APPLICATION INFORMATION
100 nF
Q
SI
RO
I
GND
RADJ
D
10 µF
10 k
ST
PWM
GND
D
47 nF
Q
REF
VBAT
RREF
LED
Dragon
I
Microcontroller
0.47
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
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Copyright © 2008, Texas Instruments Incorporated


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