STMicroelectronics | L6599AD

The L6599AD is an improved high voltage resonant controller compared to the previous L6599 controller with operating frequency of up to 500 kHz. It is a double-ended controller specific to series-resonant half bridge topology.

It consist of two switches high-side switch and low-side switch with 50% complementary duty cycle. The two switches are driven ON/OFF 180° out-of-phase for exactly the same time.  A fixed deadtime inserted between the turn-off of one switch and the turn-on of the other guarantees soft-switching and enables high-frequency operation.

Features:

• 50% duty cycle, variable frequency control of resonant half bridge
• High-accuracy oscillator
• Up to 500 kHz 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
• 600 V-rail compatible high-side gate driver with integrated bootstrap diode and high dv/dt immunity
• -300/800 mA high-side and low-side gate drivers with UVLO pull-down
• DIP-16, SO-16N package

Applications:

• LCD and PDP TV
• Desktop PC, entry-level server
• Telecom SMPS
• High efficiency industrial SMPS
• AC-DC adapter, open frame SMPS