WS3214D is a dedicated LED active PFC non-isolated step-down constant current drive integrated circuit, the chip adopts super-THD® patented THD control technology, no external power supply components, and will not overheat due to self-power supply; The chip also adopts a patented maximum frequency limiting technology to avoid the frequency being too high due to CS being too small at the input voltage trough; The system works in valley switching mode, with high conversion efficiency, low EMI, high PF, and output current automatically adapting to changes in inductance and output voltage, thus truly realizing constant current driving LED.
