Adjustable Current LITIX Linear TLE4241GM Features Adjustable constant output current Wide input voltage range Low drop voltage Open load detection Overtemperature protection P-DSO-8-3, -6, -7, -8, -9 Short circuit proof Reverse polarity proof Wide temperature range: -40 C < T < 150 C j Very small SMD-Package Green Product (RoHS compliant) AEC Qualified Functional Description The TLE4241GM is an integrated adjustable constant current source. It provides an output current adjustable via different means (SET, PWM, reference resistor) which is kept nearly independent from load and supply voltage changes. The IC is designed to supply LEDs under the severe conditions of automotive applications resulting in constant brightness and extended LED lifetime. It is provided in the very small P-DSO-8-9 (Micro 8) package. Protection circuits prevent damage to the device in case of overload, short circuit, reverse polarity and overtemperature. The connected LEDs are protected against reverse polarity as well as excess voltages up to 45 V. A status output allows handling of open load and short circuit at the main output. A PWM input offers the possibility to adjust the LED brightness by pulse width modulation. With an implemented high/low current switch the output current level can be reduced e.g. for brake/tail light application. The implemented features such as adjustable output current, the high/low current switch and the provided PWM input make the device well suited for a broad range of LED and other applications. Type Package TLE4241GM P-DSO-8-9 Data Sheet 1 Rev. 1.4, 2015-10-05 TLE4241GM Circuit Description Q I Regulation High ST Regulation Low PWM SET REF Reference Voltage GND AEB03003 Figure 1 Block Diagram An internal reference voltage of typ. 1.20 V supplies the REF pin which is connected to GND via an external resistor. In the SET = H mode the reference current flowing on the REF pin is mirrored with an amplification to form the desired output current. The typ. output current in the SET = H mode calculates: 1.20 ---------------------- I /mA = 487 + 0.1 Qt, yp (1) R /k REF The output current is shown as a function of the reference resistance on Page 10 for the high as well as for the low current mode. With the PWM input the LED brightness can be regulated via duty cycle. Also PWM = L sets the TLE4241 in sleep mode resulting in a very low current consumption of << 1 A typ. Due to the high impedance of the PWM input (see timing diagram I versus V PWM PWM on Page 12) the PWM pin can thus also be used as an Enable input. Data Sheet 2 Rev. 1.4, 2015-10-05 Control Status V/I Converter