The STMicroelectronics high-voltage resonant controller is improved revision of the previous controller . It is a double-ended controller specific to series-resonant half bridge topology. It provides 50% complementary duty cycle: the high-side switch and the low-side switch are driven ON/OFF 180° out-of-phase for exactly the same time. Output voltage regulation is obtained by modulating the operating frequency. A fixed dead time inserted between the turn-off of one switch and the turn-on of the other guarantees soft-switching and enables high-frequency operation.

Interface with PFC controller
Latched disable input
Burst mode operation at light load