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www.fairchildsemi.com/fps
FPS
™
Design Guide
When you plug into a power receptacle anywhere in the world, more than likely the plug you are holding links
you to an off-line AC to DC power converter. The heart of today’s off-line converter is an integrated circuit (IC)
that not only contains the Pulse Width Modulation (PWM) circuitry and a power MOSFET converter that is
required for efficient conversion from AC to DC but also integrates a myriad of control and protection circuitry
that makes yesterday’s off-line converters bulky by comparison. Fairchild Power Switch (FPS™) is a family of
products that combines the avalanche rugged power SenseFET with state-of-the-art PWM circuitry to address a
variety of Switch Mode Power Supplies (SMPS).
An FPS™ IC contains protection against excessive heating within the converter, overloading of any DC output,
excessive currents that could damage the power MOSFET and excessive voltage of controlled DC output. These
necessary protection features are combined with advanced control features such as burst mode operation for
low standby power, a precision oscillator with frequency modulation to minimize EMI, and soft start.
Fairchild offers two design approaches:
1) Parallel dice, with SenseFET and PWM die side-by-side in one package,
2) Single die, monolithic design
The choice of these approaches allow cost-effective designs for a broad range of applications that include
chargers, adapters, set top boxes, VCR, DVD players, LCD and CRT TVs, LCD and CRT monitors, white goods,
PCs, notebooks and assorted household appliances.
The integration level is optimal and minimizes component count and saves board space. The FPS™ concept
provides cost-effective solutions for Flyback and Forward Converter topologies with outstanding reliability.
Combined with years of manufacturing expertise, these state-of-the-art off-line power switching solutions provide
the designers with the ability to do rapid production ramp-ups of their advanced SMPS design.
What is Fairchild Power Switch (FPS™)
Summary of Contents for FPS Series
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