A4H254-8F8T | FOXBORO/Extreme Networks | Auxiliary switch serial

Description

A4H254-8F8T | FOXBORO/Extreme Networks | Auxiliary switch serial

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In this topology, the A4H254-8F8T transformer is reset through the serial capacitor of the auxiliary switch throughout the entire shutdown time of the main switch, which can eliminate the ineffective time in the forward structure of a single switch. Its main advantages include low switching loss, the ability to operate at a duty cycle of over 50%, and the reduction of current stress on the primary side switch. Meanwhile, this structure also provides self driving synchronous rectification function, eliminating the need for dedicated gate drive circuits. In addition, with the decreasing price of low-voltage MOSFETs, using MOSFETs and synchronous rectification has become a feasible solution to achieve low output voltage and high current rectification.

The use of active clamping devices and control of active clamping FETs in A4H254-8F8T may appear to increase circuit complexity, but it can be compensated for by saving buffer circuits, reset circuits, and lower overall switch requirements. This structure can also operate over a wide range of input voltages, making it suitable for various applications, including television game consoles.

The main drawback of this structure is that it has not been widely applied, such as in computers, A4H254-8F8T, so it is unfamiliar to most desktop design engineers. However, with companies like Ansemy Semiconductor continuously launching products, the difficulty of implementing this topology has decreased. Adopting this structure in large-scale applications can also reduce the cost of using components. Another drawback of this topology is that compared to dual switch forward or half bridge transformers, it requires a switch with a higher rated voltage.

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