VLSI implementation of adaptive current controller for high bright LED lighting

An adaptive highly linear current controller for high bright Light Emitting Diode (LED) lighting based on temperature sensor is presented. A highly linear current controller with multiple level temperatures detecting point is proposed and implemented. LED driving current is controlled linearly to reduce the brightness of the LED lighting to avoid the damage of the LED and to extend its life time. The range of temperature supported by this proposed design is from 60°C to 150°C. The proposed adaptive current controller is designed to deliver 100mA. It reduces the LED driving current 10% according to every 10°C rise in the ambient temperature instead of 25% current reduction for every 20°C after 110°C in the existing system. The proposed adaptive current controller reduces the driving current linearly and hence the flickering of LED is avoided compared to the existing system. Schematic and Layout of the proposed current controller is implemented in 0.18μm process technology and the simulation has been carried out using Cadence ADE with Spectre. The proposed adaptive current controller consumes 68.97×26.90 μm² area and 69.33 μW power.