"Fairchild's FSB127H is a green mode power switch that meets the 2013 ErP of the 6 standby power regulation, and integrates advanced mode of current mode pulse width modulation (PWM) and SenseFET avalanche resistant 700V in a single package solution. Mwsavertm technology of Fairchild Semiconductor can effectively reduce standby power consumption and no-load consumption, and help designers solve the problem of realizing standby mode lower than 0.5W. It is mainly used in auxiliary power supply of PC, server, LCD, TV and game controller, VCR, SVR, STB, DVD and DVCD, switching power supply of printer and scanner, general adapter, etc. This paper introduces the main characteristics of fsb127h, block diagram, anti word excitation application circuit and application word decoding circuit diagram.
Fsb127h is an innovative mwsave using Fairchild Semiconductor ™ Next generation green Mode Fairchild Semiconductor power switch (FPS) ™）， It can significantly reduce standby and no-load power consumption, so as to meet the efficiency criteria of all standby modes in the world. It integrates advanced current mode pulse width modulator (PWM) and avalanche 700V sensefet in a single package, so that the auxiliary power supply design has higher standby energy efficiency, smaller size, higher reliability and lower system cost than previous solutions.
Mwsave of Fairchild Semiconductor ™ Technology can provide the best in class minimum no-load and light load power consumption. Innovative ax cap ™ The method is five proprietary mwsavers ™ One of the technologies is to minimize the loss of EMI filter level by eliminating the discharge resistance of X capacitor and still meeting the safety requirements of iec61010-1. As the load decreases, mwsave ™ The green mode will gradually reduce the switching frequency to minimize the switching loss.
The new proprietary asynchronous jitter reduces EMI radiation, and the built-in synchronous slope compensation allows stable peak current mode control over a wide input voltage range. The proprietary internal line compensation function ensures a constant output power limit over the entire common line voltage range.
Fsb127h requires the least number of external components. It provides a basic platform, which is very suitable for cost-effective flyback converter design with low standby power consumption.
Main features of fsb127h:
MWSaver ™ technology
achieve low no-load power consumption of less than 40mW at 230VAC (including EMI filter loss)
meet the 2013 ERP standby power regulations for ATX power supply and LCD TV (less than 0.5W power consumption under 0.25W load)
ax cap ™ Technology to eliminate the discharge resistance loss of X capacitor
linearly reduce the switching frequency under light load conditions and realize advanced burst mode operation under no-load conditions
700V high voltage JFET starting circuit can eliminate starting resistance loss
Highly integrated with rich functions
internal avalanche durable 700V sensefet
Built in 10ms soft start
peak current mode control
cycle by cycle current limiting
leading edge blanking (LEB)
synchronous slope compensation
proprietary asynchronous reduction of EMI jitter to provide
Advanced protection
internal overload / open loop protection (OLP)
VDD undervoltage lockout (UVLO)
VDD overvoltage protection (OVP)
constant power limit (entire AC input range)
internal automatic restart circuit (OLP, VDD, OVP, OTP)
internal OTP sensor with hysteresis
adjustable peak current limit
Fsb127h application:
Universal switching mode power supply and flyback power converter, including:
auxiliary power supply for PC, server, LCD TV and game console
SMPS scanners for VCR, SVR, STB, DVD and DVCD players, printers, fax machines
universal adapter
LCD display power supply / open SMPS
Figure 1. Fsb127h rectangle
Figure 2. Fsb127h typical flyback application circuit
Figure 3. Typical application circuit diagram of fsb127h
Figure 4. Fsb127h transformer circuit
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