STMicroelectronics

L6591

L6591 Description

The L6591 from STMicroelectronics is a high-performance offline half-bridge resonant controller IC designed for AC/DC converters and offline power supplies. This surface-mount device operates with an input voltage range of 8.7V to 22V and supports switching frequencies up to 500kHz, making it suitable for high-efficiency power conversion applications. With a 50% duty cycle and isolated output, it ensures stable and reliable performance in demanding environments. The L6591 is RoHS3 compliant and adheres to REACH unaffected standards, ensuring environmental and regulatory compliance.

L6591 Features

• Advanced Control Features: Includes frequency control and soft-start functionality for smooth power-up sequences.
• Robust Fault Protection: Integrated current limiting and overload protection enhance system reliability.
• Wide Voltage Range: Operates from 8.7V to 22V, with a startup voltage of 14V, ensuring compatibility with diverse power supplies.
• High Switching Frequency: Supports up to 500kHz, enabling compact and efficient power supply designs.
• Isolated Output: Provides galvanic isolation for improved safety and noise immunity.
• Industry Compliance: ROHS3 compliant, REACH unaffected, and MSL3 rated (168 hours moisture sensitivity).

L6591 Applications

The L6591 is ideal for:

• Switch-mode power supplies (SMPS) requiring high efficiency and compact footprints.
• LED drivers and industrial power systems where stable, isolated outputs are critical.
• Server/telecom power supplies benefiting from its high switching frequency and fault protection.
• Consumer electronics such as adapters and chargers, leveraging its soft-start and frequency control.

Conclusion of L6591

The L6591 stands out as a versatile and reliable half-bridge resonant controller, offering high efficiency, robust protection, and flexible control features. Its wide input voltage range, isolated output, and compliance with environmental standards make it a preferred choice for modern power supply designs. Whether for industrial, consumer, or telecom applications, the L6591 delivers superior performance and durability, ensuring long-term operational stability.