Over what input voltage range must your design operate?
European (195 - 265 Vac)
Wide (80 - 265 Vac)
What topology would you like to use in your design?
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?
Further refine your output power requirements, within the initial 0-25 W range.
What type of device would you like to use?
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?
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?
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.