New Green FPS™ e-Series™ Optimizes Efficiency and System Reliability in 25W or Lower Power Supply Designs

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Fairchild’s new Green FPS e-Series, a new family of Fairchild Power Switch (FPS™) products meet low standby power and EMI regulations. These power switches are based on Fairchild’s proprietary valley switching technique that raises power conversion efficiency by 1% and reduces EMI up to 5dB compared to conventional hard-switch converter topologies. These highly integrated FPS devices combine the functionality of a fully avalanche-rated SenseFET, a current mode pulse width modulation (PWM) IC and various protection functions, simplifying design and improving system reliability. Utilizing advanced burst-mode operation, the Green FPS e-Series devices meet standby power regulations by reducing standby power consumption to below 0.2W at no load conditions (below 1W at 0.5W load). These power switches provide the highest levels of efficiency to meet the standards as specified by the California Energy Commission (CEC), EU Code of Conduct and Group for Energy Efficient Appliances (GEEA).

The Green FPS e-Series products use an advanced control technique that allows power converters to operate with narrow frequency variation while maintaining valley switching operation. Valley switching operation enables the MOSFET to turn on with minimum drain voltage and offers inherent frequency modulation, resulting in a dramatic reduction in EMI noise up to 5dB compared to conventional hard switch converters. This valley switching operation also enables these converters to perform soft switching, therefore increasing power conversion efficiency by 1% while drastically reducing heat generation.

Designs employing Green FPS e-Series products provide superior system reliability and space benefits compared to discrete MOSFET/controllers, RCC switching converters, or conventional hard switching solutions due to space saving 8 lead DIP and 8 lead LSOP packaging and the inclusion of a variety of protection circuitry. This circuitry includes over-voltage protection (OVP), over-load protection (OLP), abnormal over-current protection (AOCP) and thermal shutdown protection (TSD). Additional features include an integrated fixed oscillator, under- voltage lock out (UVLO), optimized blanking and gate turn-on/turn-off driver, and temperature compensated precision current sources for loop compensation.

 

FEATURES Optimized for quasi-resonant converters (QRC) through valley switching High efficiency through minimum voltage switching 1% improvement over hard switch topologies Low EMI through variable frequency control and inherent frequency modulation Up to 5dB over hard switch topologies Advanced burst-mode operation for low standby power consumption and minimized audible noise Narrow frequency variation range over wide load and input voltage variation Pulse-by-pulse current limit Various protection functions: over-load protection (OLP), over-voltage protection (OVP), abnormal over-current protection (AOCP), thermal shutdown protection (TSD) Under-voltage lock out (UVLO) with hysteresis Internal startup circuit Built-in soft start (15ms)

APPLICATIONS Set-top boxes Power supply designs below 25W Chargers and adapters Driving high brightness LEDs Industrial meter reading Test and measurement equipment Motor control

 

 

 

 

 Featured Products

Part Number		Description	Data Sheet	App. Notes
FSQ0165RN		Green Mode Fairchild Power Switch (FPS™) for Valley Switching Converter - Low EMI and High Efficiency
FSQ0265RN		Green Mode Fairchild Power Switch (FPS™) for Valley Switching Converter - Low EMI and High Efficiency
FSQ0365RN		Green Mode Fairchild Power Switch (FPS™) for Valley Switching Converter - Low EMI and High Efficiency
FSQ311		Green Mode Fairchild Power Switch (FPS™) for Valley Switching Converter - Low EMI and High Efficiency
FSQ321		Green Mode Fairchild Power Switch (FPS™) for Valley Switching Converter - Low EMI and High Efficiency

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