基于TPS92314的LED灯设计

The lighting design of LED based on TPS92314

采用TPS92314控制LED灯点亮,并实现LED亮度的控制。TPS92314工作在反激变换模式,反激变换器可以省去输出LC滤波,只需电容滤波。采用电流临界连续模式,在初级检测电流,无需次级LED电流检测电阻,可以通过控制初级电流来控制LED的亮度,无需光耦、外接电压基准等反馈环节的电路,电路结构简单,这种反激式变换器在小功率电路中优势比较明显。

TPS92314 is used to control the lighting and brightness of LED. It operate at fly-back mode which can only need capacitor filter but not LC filtering. Critical continuous current mode is applied to test the primary current without secondary LED current sense resistor. The brightness of LED is adjusted by the primary current, so opto-coupler and external voltage reference circuit are saved. The fly-back converter shows obvious advantages in small power circuit.