STMicroelectronics | L6591

The L6591 is a double-ended PWM controller specific for the soft-switched half-bridge topology. It provides complementary PWM control, where the high-side switch is driven ON for a duty cycle D and the low-side switch for a duty cycle 1-D, with D < 50%. An externally programmable dead time 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:

• Complementary PWM control for soft-switched half-bridge with programmable dead-time
• Up to 500 kHz operating frequency
• On-board high-voltage start-up
• Advanced light load management
• Adaptive UVLO
• Pulse-by-pulse OCP
• OLP (latched or autorestart)
• Transformer saturation detection
• Interface with PFC controller
• Latched disable input
• Input for power-on sequencing or brownout protection
• Programmable soft-start
• 4% precision external reference
• 600 V-rail compatible high-side gate driver with integrated bootstrap diode and high dV/dt
• immunity
• SO16N package

Applications:

• High power AC-DC adapter/charger
• Desktop PC, entry-level server
• Telecom SMPS