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Reduce Standby Power To PowerPoint PPT Presentation
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Reduce Standby Power To <10mW
FAN302HLPSR/SSR Mixed PWM Controller
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• Low Standby Power : Need a solution to comply to future energy efficiency regulations
Source: Consortium of Mobile-Phone Makers
The Power Saving Challenge
• 5 Star Level Score Chart from the Consortium of Mobile-Phone Makers calls for standby power < 30 mW for mobile charger
• Expect < 30 mW could soon extend to more applications and higher power
• More stringent standards are expected to come.
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Smaller Form Factor Challenge
Design trend moving to even smaller form factors
• Reducing even more components• Integration is necessary
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Constantly drawing Power – Standby Power Loss
• Today, between 6 and 10 billion power supplies plugged-in constantly draw power
• Figures for most developed countries show 5% to 10% of power consumption going to standby power
• Numbers illustrate the growing concern of energy waste and attention drawn to reducing standby power
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Key Growth Area of AC-DC Power Supplies – Mobile Communication
• Key growth area will be communications, driven by mobile phones
• A 60% increase in just four years
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2009 2010 2011 2012 2013 2014
Uni
ts in
Mill
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Years
Worldwide Power Supply Market
UPS
INVERTERS
BATTERY CHARGERS
DC-DC
AC-DC
Source: Selantek Power Supply Report 2010
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Market Trend for Smart Devices
• If we take US market as an example :• Smartphone and feature phone shipments will meet the cross point in US market
• Smartphone shipment will increase sharply in the coming years, but feature phone shipment will continuously drop
• Among various PCs, the Tablet will have the highest growth rate
• The growth trend for smart devices is spreading to the whole world
Source : Nielson (2010/11)
Note: Percentages may not total 100% because of roundingSource: Forrester Research eReader Forecast, 2010 to 2015 (US)
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System Losses at No Load
• Switching Loss
• Conduction Loss
SWDSOSS fVC 2
2
1
RV 2
Bridge Diode and Filtering
AC
RCD snubber
Power Switch
PWM Controller Optocoupler
Rectification
Error Amplifier and Loop
Compensation
Vo
Start-up Resistor Loss Switching Loss & Gate Drive Loss
IsolationEMI Filter
PWM IC Operation Loss
Shunt Regulator Divider Resistive Loss
FB Loss
Snubber Loss Core LossEMI Bleeding Resistor Loss
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mWSaver™ Technology for Smart Devices
• mWSaver™ technology is an optimized combination of process and circuit technologies that will be embedded in key power adapter components
• All components with the mWSaver technology brand designation will feature the industry’s lowest standby/no-load power consumption per component
• mWSaver Technology Solution for Smart Devices, FAN302HL:
• PWM controller that achieves under 10 mW standby power.
• Suitable for application from 5 W~15 W, the power range for Smart Devices (smart phones and tablet PCs).
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• New Primary Side CC Charger controller IC
• Three dynamic partial shutdown strategies• Normal Mode: CC and CV heavy load• Green Mode: CV mid. and light load • Burst Mode: CV no load
Achieve Standby power <10 mW
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Smaller Form Factor With Higher Switching Frequency
• Higher frequency reduces transformer size FAN302HL is a PWM controller with 85kHz switching frequency
while the conventional ones are around 50kHz The transformers used for 85kHz are only 32% of those used for
50kHz
Used for 5 W/50kHz
Dimensions:16W x18D x 14H(mm)=4032mm2
Used for 5 W/85kHz
Dimensions:12W x 12D x 9H(mm)=1296mm2
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Smaller Form Factor With VS OVP
• Reduce PCB size by reducing external components with VS OVP
• VS OVP for safer system and reduced part count
TL431
VO
VDD
External 2nd side OVP circuit : 1.Photo coupler2.TL4313.2x BJT4.Capacitors and resistors
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Good CV dynamic CV ±5% vs. CC ±10% Ripple < 100mV Meets Highest Efficiency Standards
Other Benefits from FAN302HL
CC from PSR
CV from SSR
± 5%CV & CC
± 10%
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Meeting Typical Application Specs with FAN302HL
5 W Solution 10 W Solution
Applications• Smart phone charger
• 5 V, 1 A
• Tablet PC charger
• 5 V, 2 A
Some Key Specifications
• < 10 mW Stand-by Power
• < ±2.5% in CV
• < 100 mVp-p
• > 74% @ 100 VAC
• < 6 V OVP
• < 10 mW Stand-by Power
• < ±2.5% in CV
• < 100 mVp-p
• > 80% @ 100 VAC
• < 6 V OVP
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• FAN302HL provides <10mW standby power for applications 15W and below
• mWSaver™ technology is being designed into a series of SMPS ICs that will be released throughout 2011.
• By developing solutions like mWSaver technology and the FAN302HL, Fairchild enables engineers to drive innovation in their designs for maximum performance, simplified design and reduced bill of materials costs.
mWSaver™ Technology – Provides the Best-in-Class Standby Power
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