L6599 is a high-voltage resonant controller produced by ST. It supports 50% duty cycle, variable frequency control of resonant half-bridge, high-accuracy oscillator, up to 500 kHz operating frequency, dual-level OCP, interface with PFC controller, latched disable input, light load burst-mode operation, input for power-ON/OFF sequencing or brownout protection, non-linear soft-start, 600V-rail compatible high-side gate driver with integrated bootstrap diode and high dV/dt immunity, -300/800mA high-side and low-side gate drivers with UVLO pull-down