7W Single-stage PFC LED Lighting Design with TRIAC Brightness Adjustment Part 2

Figure 6 PCB assembly diagram - layer 2

3.4 Efficiency Figure 7 Efficiency vs. input voltage 3.5 Line voltage regulation Figure 8 Output current vs. input voltage 3.6 Power factor Figure 9 Power factor vs. input voltage 3.7 TRIAC brightness adjustment performance

Table 2 Output current of different brightness regulator conduction angles

 

Figure 10 Relationship between output current and conduction angle of brightness adjuster Figure 11 Input current and input voltage at different conduction angles 4 Conclusion This article analyzes the primary-side constant power control single-stage inverting LED driver and introduces the advantages of using primary-side control based on TPS92210. At the same time, we also implemented a real 7W design. It shows many benefits of TPS92210 solution, such as small size, low cost, high PF and high TRIAC brightness adjustment performance.