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TL4242 Status: ACTIVE

Adjustable LED Driver


      
         
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Datasheet

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 TL4242
Output Channels1  
Per Channel Drive(mA)500  
Data Input1  
Data Vin(Min)(V)4.5  
Data Vin(Max)(V)42  
LED Voltage(Max)(V)42  
Pin/Package8SON  
Approx. Price (US$) 0.65 | 1ku  
 Samples
 Inventory

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Product Information

Features

  • Adjustable Constant Current up to 500 mA (±5%)
  • Wide Input Voltage Range up to 42 V
  • Low Drop Voltage
  • Open-Load Detection
  • Overtemperature Protection
  • Short-Circuit Proof
  • Reverse-Polarity Proof
  • Wide Temperature Range: –40°C to 150°C

DESCRIPTION/ORDERING INFORMATION

The TL4242 is an integrated adjustable constant-current source, driving loads up to 500 mA. The output current level can be adjusted via an external resistor. The device is designed to supply high-power LEDs (for example, OSRAM Dragon LA W57B) under the severe conditions of automotive applications, resulting in constant brightness and extended LED lifetime. It is provided in the DRJ (QFN) package. Protection circuits prevent damage to the device in case of overload, short circuit, reverse polarity, and overheat. The connected LEDs are protected against reverse polarity as well as excess voltages up to 45 V.

The integrated PWM input of the TL4242 permits LED brightness regulation by pulse-width modulation (PWM). Due to the high input impedance of the PWM input, the LED driver can be operated as a protected high-side switch.

The TL4242 is characterized for operation from –40°C to 150°C.

An external shunt resistor in the ground path of the connected LEDs is used to sense the LED current. A regulation loop holds the voltage drop at the shunt resistor at a constant level of 177 mV (typical). The constant-current level can be adjusted by selecting the shunt resistance, RREF. Calculate the typical output current using the equation:

IQ,typ = VREF/RREF

where VREF is the reference voltage (typically 177 mV) (see Reference Electrical Characteristics). The equation applies for RREF = 0.39 to 10 .

The output current is shown as a function of the reference resistance in Figure 1. With the PWM input, the LED brightness can be regulated via duty cycle. Also, PWM = L sets the TL4242 in sleep mode, resulting in a very low current consumption of <s;1 µA (typical). Due to the high impedance of the PWM input (see Figure 4), the PWM pin also can be used as an enable input.

    

Pricing / Packaging / CAD Design Tools / Samples

PricePackagingSamples
DeviceStatusTemp (oC)Price | QuantityPackage | PinsPackage QTY | Package CarrierSamples
TL4242DRJRACTIVE-40 to 850.65 | 1kuSON (DRJ) | 8 1000 | LARGE T&R

* Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For higher volume price quotes,prices in local currency or delivery quotes, please contact your local Texas Instruments Sales Office or Authorized Distributor.

Inventory

Reported Distributor Inventory as of 10:42 AM GMT, 26 Nov 2009
RegionCompanyIn StockPurchase
TI Lead Time*: 18 WeeksTL4242DRJR
None Reported
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** Lead time information is not available at this time. However, our information is updated daily so please check back with us soon. Please contact your preferred TI Authorized Distributor for additional information.

Quality & Lead (Pb)-Free Data

 Product ContentDPPM / MTBF / FIT Rate
DeviceEco Plan* Lead / Ball FinishMSL Rating / Peak ReflowDetailsDetails
TL4242DRJR RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-3-260C-168 HRViewView

* The planned eco-friendly classification: Pb-Free (RoHS) or Pb-Free (RoHS Exempt) or Green (RoHS & no Sb/Br) - please click on the Product Content Details "View" link in the table above for the latest availability information and additional product content details.

If the information you are requesting is not available online at this time, contact one of our Product Information Centers regarding the availability of this information.

Technical Documents

Most useful technical documents for TL4242 Help

Datasheet

User Guides

Tools & Software

NamePart # Company Tool / Software Type
TL4242EVM-543 Evaluation ModuleTL4242EVM-543Texas InstrumentsDevelopment Boards/EVMs

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