FAN5358S710X

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The FAN5358S710X is a switch-mode power supply (SMPS) controller IC from Fairchild Semiconductor and is part of a series of high performance and low cost SMPS controllers specifically designed for off-line and dc-to-dc converter applications. Particularly, the FAN5358S710X is a simple PWM controller featuring high accuracy current and frequency control across a wide range of operating conditions. Additionally, the FAN5358S710X incorporates short circuit protection, cycle-by-cycle current limit and thermal shutdown protection, making it the optimal choice for cost effective and reliable power supply designs.

Application Field

The FAN5358S710X is suitable for a wide range of applications, such as adapters, power supplies, battery chargers, motor control and telecommunication equipment. Specifically, the FAN5358S710X has been widely used in consumer applications such as notebooks, TVs and any other equipment requiring a regulated dc-to-dc or off-line power supply.

Working Principle

The FAN5358S710X operates as a quasi-resonant regulator, which can achieve high efficiency and smooth line/load transient response. It operates in the quasi-resonant mode near the zero voltage transition (ZVT). In the quasi-resonant operation, the switching frequency varies automatically depending on the load and line conditions, allowing for a decreased in the switching frequency under light load for lower power dissipation and a higher switching frequency under heavy load for improved efficiency.

The FAN5358S710X regulates the output voltage by controlling the duty cycle of the quasi-resonant peak current mode. It is designed around a loop control scheme with output voltage control, cycle-by-cycle current limit and soft-start control. Furthermore, it provides protection against overloads and short circuits, preventing any potential damage to external components.

The FAN5358S710X also features an adjustable off-time control for increased flexibility in optimizing the trade-off between efficiency and total noise. Furthermore, it includes an active digital frequency-hopping function to avoid harmonic interference from digital switching noise.

Conclusion

The FAN5358S710X is a simple and affordable PWM controller designed for off-line and dc-to-dc converter applications. Particularly, it is suitable for consumer applications such as notebooks, TVs and any other equipment requiring a regulated dc-to-dc or off-line power supply. Additionally, the FAN5358S710X enables system designers to achieve high efficiency, stable performance, improved load transient response and noise control with a wide range of operating conditions.

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