DefinePK

Abstract

LED driver is an electrical device that provides the required voltage and regulates the constant amount of power to the LED's needs or string of LEDs. This article presents the design and development of voltage references for an LED driver IC. Integrated circuit design in multiple device technologies such as an LED driver requires a built-in voltage reference circuit to convert a high voltage into an appropriate voltages level for internal usage. The design of voltage reference is started with the behavioral modeling of LED driver IC. The obtained parameters from the behavioral modeling were used as the specification for the design of voltage reference in a commercial X-Fab XDM10 1.0 µm 350 V process technology. The circuit consists of a series regulator, bandgap, and opamp-based regulator. It produces 1.2 V for VREF or VH, 0.4 V for VREF_EA, and 0.2 V for VL. The circuit was also used to generate 5 V internal supply voltage, VDD. These voltages vary only by 10 % across PVT.