TLE4309G

The TLE4309G is an integrated Adjustable Constant Current Source for driving loads up to 500mA. The output current level can be adjusted with an external shunt resistor. Supplying high power LEDs with the TLE4309 ensures constant brightness independent from supply voltage or LED forward voltage spread. Therefore, LED lifetime is extended by protecting from overcurrent and over-temperature. Due to the high impedance of the PWM/EN input, the TLE4309 can be used as a protected high-side switch. Protection circuits prevent from damage to the IC in case of overload, short circuit and reverse polarity. A chip temperature monitoring circuit shuts off the power stage and prevents the IC from destruction under fault conditions. In case of negative input voltage, a leakage current is flowing only from the output to the input, hence the LED is protected against reverse supply. Input voltage peaks up to 45V are absorbed by the IC, preventing the LEDs from overcurrent.