TL4242TDRJRQ1

FEATURES

• Qualified for Automotive Applications

• AEC-Q100 Test Guidance With the Following Results:

– Device Temperature Grade 2: –40°C to 105°C Ambient Operating Temperature Range for QFN package

– Device Temperature Grade 1: –40°C to 125°C Ambient Operating Temperature Range for SFM package

– Device HBM ESD Classification Level H1C

– Device CDM ESD Classification Level C3B

• Adjustable Constant Current up to 500 mA (±5%)

• 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:

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.

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