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SB340 Scheda tecnica(PDF) 1 Page - Fairchild Semiconductor |
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SB340 Scheda tecnica(HTML) 1 Page - Fairchild Semiconductor |
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1 / 10 page  www.fairchildsemi.com © 2009 Fairchild Semiconductor Corporation www.fairchildsemi.com Rev. 1.0.1 • 9/18/09 1 AN-8024 Applying Fairchild Power Switch (FPS TM) FSBH-series to Standby Auxiliary Power Supply 1. Introduction The highly integrated FSBH-series consists of an integrated current mode Pulse Width Modulator (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 minimize 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 maximize the light load efficiency so that the power supply can meet stringent standby power regulations. The FSBH-series has built-in synchronized 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 optimize the power stage. Many protection functions, such as open-loop / overload protection (OLP), over-voltage protection (OVP), brownout protection, and over-temperature protection (OTP); 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 maximize efficiency. For multi-output applications, refer to Fairchild application note AN-4137. Figure 1. Typical Application Circuit |
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