Design of isolated flyback LED driver based on LYT4326E

摘要

The design of a high efficiency, silicon controlled dimming and power factor correction (PFC) LED drive power supply is proposed. The LED driver power supply uses isolated flyback topology, with high efficiency and power factor, and also has a no-load protection, short circuit protection and overvoltage protection. The power controller chip LYT4326E and working principle of the circuit are analyzed. Experimental results verify that the full load efficiency of the power supply circuit is over 86%,with a high power factor and can run stably and reliably.