LM3445-REF, 230 Vac Off-line TRIAC Dimmer Retrofit with 6 LEDs Reference Design

LM3445-REF, the main purpose of the power supply is to convert the rectified AC Input to DC regulated current for 6 LEDs. The power supply provides protection for the LEDs, limits the transient input voltage and protect against inrush current at plug in. The overall power supply conformity (e.g. mains harmonics (EN), mains interference, international safety standards etc.) are not approved for all the applicable European Norms (EN). The principle of this power supply is a step down. It is regulated by the 350ma average current with a fixed Toff time. At the heart of the power supply is the controller LM3445 current mode control from National Semiconductor. The LM3445 switching frequency is set at a nominal 45 kHz