L6599 is a high-voltage resonant controller from ST company, it features 50% duty cycle, variable frequency control of resonant half-bridge, high-accuracy oscillator, up to 500kHz operating frequency, two-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 for monotonic output voltage rise, 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
The L6599 is a double‑ended controller designed for resonant half‑bridge topologies, delivering a 50 % complementary duty cycle and frequency‑modulated output voltage regulation. It features a high‑voltage floating structure capable of withstanding over 600 V, integrated bootstrap diode, and programmable oscillator for setting the operating frequency range.
The document includes detailed pin descriptions, electrical ratings, thermal data, and typical application circuits. It also covers protection functions such as over‑current protection, latched shutdown, burst‑mode operation, and interface options for PFC controllers.
| Maximum operating frequency | 500 kHz |
|---|---|
| Supply voltage range (Voc) | 8.85 V – 16 V |
| Floating supply voltage rating | -1 V to 618 V |
| Quiescent current (typical) | 2 mA |
The L6599 can operate up to 500 kHz.