The lighting system adopts a direct drive design
The total of the upper and lower limits of the LED operating voltage range must be within the output voltage range of the LED power supply. For example, the LED specification is 3.4~3.6V, and the series connection voltage of 6 strings is 20.4~21.6V. At this time, the output voltage must be selected. It is a 24V (constant current range 18~24V) model.
For models with power factor correction function, if the PF value is required to be greater than 0.9, the load must be greater than the range defined by PFC in the specification. Above 75% LOAD.
If it is used in places where the input voltage is unstable, such as using generator equipment or in heavy industrial areas, please select the "general-purpose" product in Table 1.
The lighting system adopts constant current IC design
The startup voltage of the driver IC should be designed to be close to the output voltage of the LED power supply.
The driver IC has high requirements on voltage stability, and it is recommended to use the "general-purpose type" products in Table 1.
For models with power factor correction function, the load must be larger than the range defined by PFC in the specification. The relationship between power factor and output load is shown in Figure (1), which will be defined differently depending on the model. Generally, the design value is above 75% LOAD.
The use of driver ICs may cause EMI matching problems, and EMI needs to be confirmed after the lamp design is completed.