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Fly back solution optimised for limited-space apps

Posted: 05 Aug 2011     Print Version  Bookmark and Share

Keywords:mWSaver technology  fly back solution  ErP standard  AIO 

Fairchild Semiconductor offers a dual switch fly back power supply solution designed for All-In-One (AIO) applications that claims to provide competitive alternative to LLC and single switch Quasi-resonant (QR) flyback topologies.

The dual switch fly back solution incorporates mWSaver technology enabling designs to meet 2013 ErP standard without additional components that competitive topologies require.

When balancing ease of design, power loss at different loading, and efficiency, each of these topologies has advantages and disadvantages. For AIO power range, LLC is said to offer the best overall efficiency, compared to dual switch QR and single switch QR flyback converters. The LLC transformer is difficult to design and results in the highest light load power loss among the three topologies. Single switch QR flyback converters are the least efficient, but they are easy to design and offer low power loss at light load.

Fairchild's dual switch QR flyback topology and secondary synchronous rectification is said to be the ideal solution for AIO applications—providing good overall efficiency, managing low power loss at light load, while providing ease of design.

According to the company, the AIO solution is perfectly suited for applications from 75W-230W and consists of the FAN6920MR integrated critical mode PFC and Quasi-resonant Current Mode PWM controller, the FAN7382 gate driver, in tandem with the FAN6204 secondary synchronous rectifier controller for flyback topology and forward freewheeling rectification.

Incorporating mWSaver technology, these devices additionally claim to offer the lowest standby power input for AIO solutions. Quasi-resonant control reduces snubber and leakage inductance losses, while improving thermal issues. It also claims to lower the Vds of the SR MOSFET to provide improved efficiency, and allows for smaller board size. Built-in two-level PFC output improves low line efficiency.

Adding the FAN7382, a high and low side gate drive IC, rounds out Fairchild's solution by providing the ability to drive Fairchild's high-voltage MOSFETs up to 600V. This device claims to provide stable operation of the high-side driver under high-dv/dt noise circumstances.

According to the company, the FAN6920MR combines a power factor correction (PFC) controller and a quasi-resonant PWM controller for a cost effective design that uses fewer external components. For PFC, the device uses a controlled on-time technique to provide a regulated DC output voltage and to perform natural power factor correction.

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