ON Semiconductor Launches High-Efficiency LED Power Solution for Street Lighting

In recent years, the industry has shown a growing interest in ultra-high-efficiency LED lighting topologies, expecting to provide more than 90% efficiency at relatively low power levels (<50 W), an efficiency target that is even higher than the Energy Star 2.0 external power supply efficiency requirements (more than 87% efficiency at power levels not exceeding 49 W). To achieve such high efficiency, new topologies are needed, such as switching from a flyback topology to a resonant half-bridge topology, thereby fully leveraging the advantages of zero voltage switching (ZVS). Fortunately, ON Semiconductor has already begun developing high-efficiency half-bridge solutions for LED driver power supplies, such as the NCP1396 and its upgraded version, the NCP1397 high-performance resonant mode controller. The NCP1397 has built-in high-end and low-end drivers, supports adjustable and precise minimum frequencies, provides extremely high efficiency, and has a variety of fault protection features. The LED power supply solution based on the NCP1607 PFC controller and the NCP1397 dual-inductor plus single-capacitor (LLC) half-bridge resonant controller (Figure 2) is well suited for high-efficiency LED street lighting applications in the 50 to 300 W range.

Figure 2: High-efficiency LED power supply solution for street lighting based on NCP1607 and NCP1397.

In addition to these solutions, designers can also choose other LED power solutions from ON Semiconductor according to design requirements, such as NCP1607 PFC controller + NCP1377 quasi-resonant controller, or NCP1607 + NCP1392/3, etc.