Digital and Resonant Controllers

Product selector
CAD Resources
Tools & Software


ST’s family of resonant controllers includes primary controllers for double-ended (half-bridge) topologies, designed to provide high efficiency under any load conditions, as well as high noise immunity (zero voltage switching operation).

The L6598, the 1st generation of ST’s resonant controllers, implements an HV half bridge driver that directly drives two power MOSFETs and has a dedicated timing section to set soft start duration and minimum operating frequency.

The L6599 and L6599A, ST’s second and third generation of resonant controllers, offer increased operating frequency (up to 500 kHz), additional features such as burst-mode operation to reduce the consumption at light load operation, a dedicated pin for direct connection with the PFC controller, and improved protection features, such as two-level OCP (frequency-shift and latched shutdown), brownout protection and latched disable input. These controllers are widely used in LCD TVs, all-in-one PCs, high-power LED lighting and AC-DC adapters (>90 W).

The STNRG011 and STNRG012 featuring the programmability and monitoring of the digital power in a compact, robust and best-in-class energy saving solution that embeds both PFC multi-mode controller and resonant controller together with a full set of protections, high voltage circuit and drivers.

The STNRG328S is a digital controller for switched tank converters (STC) and hybrid switched tank converters (HSTC) topologies.

The ST-ONE is a digital controller optimized for designs based on a novel non-complementary active-clamp flyback topology, which allows high power, above 65W, with higher efficiency than other topologies such as the quasi-resonant flyback. It integrates a programmable offline power-supply controller based on Arm® Cortex®-M0+ core, a high voltage start-up circuit, a synchronous-rectification controller, and USB Power Delivery (USB-PD) circuitry in one package.