TOP258GN-TL

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Power management integrated circuits (PMICs) are essential components in consumer electronics and telecommunications. They manage and regulate power to the different components in the device, ensuring its proper working. In this regard, ACDC converters are key components as they allow us to use different power sources. Offline switchers are a type of ACDC converters that allow us to switch between the available power sources. TOP258GN-TL is one of the most popular offline switchers in the consumer electronics market and its applications, as well as its working principle will be discussed in this article.

TOP258GN-TL is an non-isolated flyback offline switcher IC in the Small (SOT-223) Package. It is designed for off-line ACDC applications and it is optimized for low power, low-cost applications such as adapters, open-frame and compact power supplies. This IC operates at an input voltage between 80VAC and 350VAC and provided a constant output voltage, that can be adjusted via a resistive divider. In addition, the TOP258GN-TL is a self-protection and it has two levels of current limiting.

The main advantages of the TOP258GN-TL, when compared to other ICs are its low power consumption, its small footprint and its low cost. Since it is an offline switcher, it does not require an additional controller, making it ideal for applications with limited space and low power applications. In addition, its self-protection features make it very reliable in terms of safety.

The working principle of the TOP258GN-TL is the same as the other offline switchers. The IC operates in the discontinuous conduction mode (DCM) and it uses a single-ended primary inductance converter (SEPIC). In DCM mode, the IC pulses the power switch on and off depending on the current in the primary winding of the transformer. The frequency of the pulsing is determined by the output current and the resonant characteristics of the transformer. When the output current falls below the minimum current, the IC enters the continuous conduction mode (CCM). In CCM mode, the power switch is constantly on and the output voltage is regulated by varying the duty cycle of the switch.

In conclusion, the TOP258GN-TL is a highly reliable and cost effective IC for offline switcher applications. It operates in the DCM and CCM mode, allowing it to provide a constant output voltage and efficient system operation. Its low power consumption, small footprint and low cost make it ideal for applications such as adapters, open-frame and compact power supplies. It is built with self-protection features and it is very robust against transients and line input variations, making it one of the most popular and reliable ICs available in the market.

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