AL5812MP-13

The AL5812 is an adjustable Linear LED driver offering excellent temperature stability and output handling capability. The AL5812 simplifies the design of linear and isolated or non-isolated LED drivers by setting the LED current with standard value resistors. The AL5812 has an open drain output that can swing from 1V up to 60V enabling it drive long LED chains. Its low 0.5V R_SET pin is outside of the LED current path and so accuracy is maintained while minimizing the required overheads to regulate the LED current. This reduces its power dissipation when compared to traditional linear LED drivers. This makes it ideal for driving LEDs up to 150mA (commonly referred to as ½W LEDs). Longer LED chains can be driven by tapping V_CC from the chain, where the chain voltage may exceed 60V. The AL5812 is available in the exposed pad MSOP-8EP and U-DFN3030-6 packages. The AL5812 is a Linear LED driver and in normal operation has the LEDs connected to the same potential as its V_CC pin and regulates the LED current by sinking current into to its LED pin. The LED current is set by the use of an external resistor, Rer, connected from the Re_SET pin to GND. This resistor supplies the bias current of the AL5812 together with current regulator to set the LED current. The nominal LED current is determined by this equation: LED current (I_LED) = 1500 * (0.5 / R_SET) With R_SET = 7.5k I_LED = 1500 x (0.5 / 7.5k) = 100mA The AL5812 with its 60V capability on its supply pin, Vcc, and its LED drive pin allows it to operate from supply rails up to 60V and/or directly drive LED chains up to 60V. The voltage applied to the V_CC pin can be greater or lower than the voltage applied to the LED string.