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TL4242-Q1 数据表(PDF) 9 Page - Texas Instruments

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部件名 TL4242-Q1
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

TL4242-Q1 数据表(HTML) 9 Page - Texas Instruments

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REF
Q max
REF
V
I
R
=
t
PWM,OFF
30%
70%
t
PWM,ON
t
STHL
Open
Load
Open
Load
t
t
t
t
V
PWM
V
PWM,H
V
PWM,L
I
Q,nom
I
Q
V
LD
V
D
V
ST
TL4242-Q1
www.ti.com
SLVS732E – JULY 2010 – REVISED JULY 2013
Figure 8. Function and Timing Diagram
Stoplight and Taillight Application
For many automobiles, the same set of LEDs illuminates both taillights and stoplights. Thus, the LEDs must
operate at two different brightness levels, full brightness for the stoplight and 10% to 25% brightness for the
taillight. The easiest way to achieve the different brightness is dimming by pulse-width modulation (PWM), which
holds the color spectrum of the LED over its whole brightness range. The maximum current that passes through
the LED is programmable by sense resistor RREF.
Obtain the maximum current, IQmax, that passes through the LEDs by the following expression:
For example, if RREF equals 1 Ω, as VREF is a fixed value range from 168 mV to 185 mV, IQmax should be 168 mA
to 185 mA.
Copyright © 2010–2013, Texas Instruments Incorporated
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