Over what input voltage range must your design operate?
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European (195 - 265 Vac)
Wide (80 - 265 Vac)
What topology would you like to use in your design?
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Forward: Forward converters are isolated buck derived converters that are popular in high power applications (>75 W) and are typically found in telecommunications products and ATX power supplies. They provide a cost effective solution and fill the gap between flyback converters and high power bridge converters.
Flyback: Flyback converters are isolated buck-boost derived converters that are popular among low power applications(<250 W) and are found in a vast majority of consumer products (notebook adapters, DVD players, set-top boxes, satellite receivers, LCD monitors). These converters are simple to design and use and are a cost effective solution for power conversion requirements.
Resonant: Resonant converters are isolated soft-switching converters that are popular in high power applications (>75 W) and are typically found in Flat Panel display power converters, high power AC/DC notebook adapters, industrial and medical power sources, and offline battery chargers. They are highly efficient due to reduced switching losses (zero-voltage switching and zero-current switching) and have much higher switching frequencies than comparable PWM controllers.
What is the specific output power of your design?
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Further refine your output power requirements, within the initial 0-25 W range.
What type of device would you like to use?
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Switcher: Switchers are recommended for low power applications and are ideal if you have limited experience in designing power supplies. Switchers provide a monolithic solution that integrates the PWM controller and switch as part of the silicon solution.
Controller: Standalone PWM controllers are recommended if you are an experienced designer and you wish to have full control over device parameters and signals, particularly the gate-source shape.
Do you want your design to operate at a fixed or variable frequency?
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Fixed: Extremely low standby power helps to easily meet applicable regulations. These controllers can help to meet the toughest design challenges while keeping cost at a minimum.
Variable: Variable frequency controllers include quasi-resonant and resonant controllers. These controllers are used respectively in critical conduction mode quasi-resonant flyback converters and half bridge resonant LLC converters. These topologies minimize EMI radiation, provide better magnetic utilization and offer excellent power conversion efficiency – up to 90%. The variable frequency controllers combine the advantages of working directly off-line with the ability to drive an external high voltage MOSFET, and offer enhanced design flexibility.
Is efficiency of the supply or simplicity of the design a higher priority?
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Selecting Simplicity will lead to devices that simplify transformer design by avoiding use of an auxiliary winding. Selecting Efficiency will lead to devices that enable maximum power supply efficiency.
