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TL4242-Q1

更新时间： 2024-11-07 01:13:35
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德州仪器 - TI 驱动
页数 文件大小 规格书
21页 986K
描述
ADJUSTABLE LED DRIVER

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TL4242-Q1 数据手册

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TL4242-Q1  
www.ti.com  
SLVS732E –JULY 2010–REVISED JULY 2013  
ADJUSTABLE LED DRIVER  
Check for Samples: TL4242-Q1  
1
FEATURES  
•
•
Short-Circuit Proof  
Reverse-Polarity Proof  
•
•
Qualified for Automotive Applications  
AEC-Q100 Test Guidance With the Following  
Results:  
KTT (SFM) PACKAGE  
(TOP VIEW)  
DRJ (QFN) PACKAGE  
(TOP VIEW)  
–
Device Temperature Grade 2: –40°C to  
105°C Ambient Operating Temperature  
Range for QFN package  
1
2
3
4
8
7
6
5
PWM  
ST  
I
Exposed  
Thermal  
Pad  
NC  
Q
D
–
Device Temperature Grade 1: –40°C to  
125°C Ambient Operating Temperature  
Range for SFM package  
GND  
REF  
1
2
3
4
5
6
7
–
–
Device HBM ESD Classification Level H1C  
Device CDM ESD Classification Level C3B  
NC – No internal connection  
•
Adjustable Constant Current  
up to 500 mA (±5%)  
I
ST REF  
Q
PWM GND  
D
•
•
•
•
Wide Input-Voltage Range up to 42 V  
Low Dropout Voltage  
Open-Load Detection  
Overtemperature Protection  
DESCRIPTION  
The TL4242-Q1 is an integrated adjustable constant-current source, driving loads up to 500 mA. One can adjust  
the output current level through an external resistor. The device design is for supplying high-power LEDs (for  
example, OSRAM Dragon LA W57B) under the severe conditions of automotive applications, resulting in  
constant brightness and extended LED lifetime. The device comes in the DRJ (QFN) package. Protection circuits  
prevent damage to the device in case of overload, short circuit, reverse polarity, and overheat. The device  
provides the connected LEDs protection against reverse polarity as well as excess voltages up to 45 V.  
The integrated PWM input of the TL4242-Q1 permits LED brightness regulation by pulse-width modulation  
(PWM). The high input impedance of the PWM input, allows operating the LED driver as a protected high-side  
switch.  
An external shunt resistor in the ground path of the connected LEDs senses the LED current. A regulation loop  
holds the voltage drop at the shunt resistor at a constant level of 177 mV (typical). The selection of the shunt  
resistance, RREF, sets the constant-current level. Calculate the typical output current using the equation:  
VREF  
=
IQ,typ  
RREF  
where VREF is the reference voltage (typically 177 mV) (see Reference Electrical Characteristics). The equation  
applies for RREF = 0.39 Ω to 10 Ω.  
The output current is shown as a function of the reference resistance in . With the PWM input, One can regulate  
the LED brightness through the duty cycle. Also, PWM = L sets the TL4242-Q1 in sleep mode, resulting in a very  
low current consumption of < 1 μA (typical). The high impedance of the PWM input (see ) permits the use of the  
PWM pin as an enable input.  
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of  
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.  
PRODUCTION DATA information is current as of publication date.  
Copyright © 2010–2013, Texas Instruments Incorporated  
Products conform to specifications per the terms of the Texas  
Instruments standard warranty. Production processing does not  
necessarily include testing of all parameters.  
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