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Applying Fairchild Power Switch (FPS) FSBH-series to standby auxiliary power supply

Posted: 11 Nov 2009     Print Version  Bookmark and Share

Keywords:power switch  FSBH series  power supply 

The highly integrated FSBH-series consist of an integrated current mode PWM and an avalanche-rugged 700V SenseFET. It is specifically designed for high-performance offline switch-mode power supplies (SMPS) with minimal external components.

The integrated PWM controller features include a proprietary green-mode function that provides off-time modulation to linearly decrease the switching frequency at light-load conditions to minimise standby power consumption. The PWM controller is manufactured using the BiCMOS process to further reduce power consumption. The green and burst modes function with a low operating current (2.5mA in green mode) to maximise the light load efficiency so that the power supply can meet stringent standby power regulations.

The FSBH-series has built-in synchronised slope compensation to achieve stable peak-current-mode control. The proprietary external line compensation ensures constant output power limit over a wide AC input voltage range, from 90VAC to 264VAC and helps optimise the power stage.

Many protection functions, such as open-loop/overload protection, over-voltage protection, brownout protection and over-temperature protection are fully integrated into FSBH-series, which improves the SMPS reliability without increasing the system cost.

This application note presents design consideration to apply FSBH-series to a standby auxiliary power supply with single output. It covers designing the transformer, selecting the components, feedback loop design and design tips to maximise efficiency.

View the PDF document for more information.

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