L6599 H-Bridge Controller Basics

The L6599 is a resonant half-bridge topology-specific double-ended controller. The high-side and low-side switches are pushed ON 180° out-of-phase for the same amount of time, resulting in a 50 percent complementary duty cycle. The operating frequency is modulated to achieve output voltage control. Soft-switching is ensured by a defined deadtime inserted between the turn-off of one switch and the turn-on of the other, allowing for high-frequency operation.

L6599 H-Bridge Controller Features

Burst-mode operation at light load

600V-rail compatible high-side gate driver with integrated bootstrap diode and high dV/dt immunity

50% duty cycle, variable frequency control of resonant half-bridge

Integrated high-accuracy oscillator

Latched disable input

Up to 500kHz operating frequency

Interface with PFC controller

Two-level OCP: frequency-shift and latched shutdown

Non-linear soft-start for monotonic output voltage rise

DIP-16, SO-16N packages

Input for power-ON/OFF sequencing or brownout protection

-300/800mA high-side and low-side gate drivers with UVLO pull-down

L6599 H-Bridge Controller Applications

LCD & PDP TV

Desktop PC

Entry-level server

Telecom SMPS

AC-DC adapter

Open frame SMPS