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TL4242

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 to 150PinoutSpecifications MIN MAX UNIT VCC S...

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TL4242: 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-Polar...

TL4242 Data Sheet

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Part Number:
TL4242
Supply Ability:
5000

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  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Upload time: 2024/12/17

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Product Details

Description



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 to 150


Pinout

Connection Diagram


Specifications

    MIN MAX UNIT
VCC Supply voltage range(2) -42 45 V
VI Input voltage range D

PWM

RE		 0.3

40

1		 7

40

16		 V

V

V
VO Output voltage range Q

ST		 1

0.3		 41

40		 V

V
IO Output current range PWM

REF

ST		   ±1

±2

±5		 mA

mA

mA
JA Thermal impedance, junction to ambient(3) JESD 51-5(4)

JESD 51-7(5)		   49.5

114.4		 /W
JP

TJ

Tstg		 Thermal impedance, junction to pad(3)

Virtual-junction temperature range

Storage temperature range

40

50		 4.4

150

150		 /W




(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating
Conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

(2) All voltage values are with respect to the network ground terminal.

(3) Maximum power dissipation is a function of TJ(max), JA, and TA. The maximum allowable power dissipation at any allowable ambient
temperature is PD = (TJ(max) TA)/JA. Operating at the absolute maximum TJ of 150 can affect reliability.

(4) The package thermal impedance is calculated in accordance with JESD 51-5.

(5) The package thermal impedance is calculated in accordance with JESD 51-7.


Description

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 to 150.

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 (typ). 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 <1 mA (typ). Due to the high impedance of the PWM input (see Figure 4), the PWM pin also can be used as an enable input.




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