Abstract
In the thesis, a single stage driver of LED arrays is addressed. It can be applied in lighting system and back-light for LCD-TV. In order to reduce the power consumption and the consideration of stability, flyback converter that can maintain the output voltage constant by using fixed frequency current-mode PWM modulation is used to be power supply. A transconductance amplifier with voltage control is employed so that the output current is almost constant. It ensures a constant current to drive LEDs without disturbance due to the forward voltage and voltage source. The features of this work are the wide input range, stable output voltage and dimming with reference voltage. Last, by the analysis of the transient response, it can be found that the output voltage can recover within a short time while the loads are changing.