L6599AT is a high-voltage resonant controller manufactured by ST. It features 50% duty cycle, variable frequency control of resonant half-bridge, high-accuracy oscillator, up to 500 kHz operating frequency, two-level OCP: frequency shift and latched shutdown, interface with PFC controller, latched disable input, burst-mode operation at light load, input for power-ON/OFF sequencing or brownout protection, non-linear soft-start for monotonic output voltage rise, 600 V-rail compatible high-side gate driver with integrated bootstrap diode and high dv/dt immunity, -300/700 mA high-side and low-side gate drivers with UVLO pull-down, DIP16, SO16N package, guaranteed for extreme temperature ranges.