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TL4242QKTTRQ1 数据表(PDF) 8 Page - Texas Instruments

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部件名 TL4242QKTTRQ1
功能描述  ADJUSTABLE LED DRIVER
Download  21 Pages
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制造商  TI [Texas Instruments]
网页  http://www.ti.com
标志 TI - Texas Instruments

TL4242QKTTRQ1 数据表(HTML) 8 Page - Texas Instruments

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background image
t
STLH,typ +
C
D
47 nF
10 ms
t
STHL,typ +
C
D
47 nF
10 ms
100 nF
Q
SI
RO
I
GND
RADJ
D
10 µF
10 kW
ST
PWM
GND
D
47 nF
Q
REF
VBAT
RREF
LED
Dragon
I
Microcontroller
0.47 W
0.25 W
TL4242-Q1
TL4242-Q1
SLVS732E – JULY 2010 – REVISED JULY 2013
www.ti.com
APPLICATION INFORMATION
Figure 7 shows a typical application with the TL4242-Q1 LED driver. A supply current adjusted by the RREF
resistor drives the three LEDs, preventing brightness variations due to forward voltage spread of the LEDs. An
appropriate duty cycle applied to the PWM pin can compensate through software for the luminosity spread
arising from the LED production process. 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-
Q1 drop voltage (maximum 0.7 V at an LED current of 300 mA), and the maximum voltage drop at the shunt
resistor RREF of 185 mV.
Figure 7. Application Circuit
The status output of the LED driver (ST) detects an open-load condition, enabling supervision of correct LED
operation. A voltage drop at the shunt resistor (RREF) below 25 mV (typical) detects an LED failure. In this case,
the status output pin (ST) goes low after a delay time adjustable by an optional capacitor connected to pin D.
Figure 8 shows the functionality and timing of ST and PWM. One can adjust the status delay through the
capacitor connected to pin D. Delay time scales linearly with the capacitance, CD:
8
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Copyright © 2010–2013, Texas Instruments Incorporated
Product Folder Links: TL4242-Q1


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