Device description

The L6599 is a double-ended controller specific for the resonant half-bridge topology. It provides 50 complementary duty cycle: the high-side switch and the low-side switch are driven ON 180° out-of-phase for exactly the same time.

Output voltage regulation is obtained by modulating the operating frequency. A fixed deadtime inserted between the turn-OFF of one switch and the turn-ON of the other one guarantees soft-switching and enables high-frequency operation.

Features

■ 50 duty cycle, variable frequency control of

resonant half-bridge

■ High-accuracy oscillator

■ Up to 500kHz operating frequency

■ Two-level OCP: frequency-shift and latched

shutdown

■ Interface with PFC controller

■ Latched disable input

■ Burst-mode operation at light load

■ 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

■ DIP-16, SO-16N packages

Applications

■ LCD & PDP TV

■ Desktop PC, entry-level server

■ Telecom SMPS

■ AC-DC adapter, open frame SMPS