STMicroelectronics

SG3524N

SG3524N Description

The SG3524N from STMicroelectronics is an obsolete but robust PWM controller IC designed for flyback and push-pull power supply topologies. Operating within a wide supply voltage range of 8V to 40V, it delivers precise transistor driver outputs with a switching frequency up to 300kHz. This 16-pin DIP packaged IC features dual outputs (positive configuration), enabling flexible power stage control. While no longer in production, it remains relevant in legacy systems due to its high reliability and simplified design integration.

SG3524N Features

• Output Type: Transistor driver (2 outputs, positive configuration).
• Wide Voltage Range: Operates from 8V to 40V, suitable for industrial and automotive applications.
• Frequency & Duty Cycle: 300kHz switching frequency with a 45% max duty cycle for efficient power conversion.
• Control Features: Includes enable pin for power management.
• Robust Compliance: ROHS3 compliant and REACH unaffected, ensuring environmental safety.
• Thermal Range: Operates at 0°C to 70°C, ideal for moderate environments.
• Legacy Reliability: MSL 1 (unlimited) moisture sensitivity, ensuring long-term storage stability.

SG3524N Applications

• Switch-Mode Power Supplies (SMPS): Flyback and push-pull converters for AC/DC and DC/DC systems.
• Industrial Power Systems: Motor drives, UPS, and inverters requiring stable PWM control.
• Legacy Electronics: Repair or maintenance of older equipment where modern replacements are incompatible.
• Automotive Electronics: Auxiliary power modules within the voltage range.

Conclusion of SG3524N

The SG3524N is a versatile PWM controller with a proven track record in power management. Its wide voltage range, dual-output design, and high switching frequency make it suitable for demanding applications, despite its obsolete status. Engineers working with legacy systems or seeking a cost-effective solution for medium-power conversion may still find value in this IC. However, for new designs, modern alternatives with enhanced features (e.g., higher efficiency, wider temp ranges) are recommended.

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