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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

0

2000

4000

6000

8000

10000

12000

14000

16000

18000

20000

2009 2010 2011 2012 2013 2014

Uni

ts in

Mill

ions

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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