Reduce Standby Power To <10mW
FAN302HL
PSR/SSR Mixed PWM Controller
1
www.fairchildsemi.com
The Power Saving Challenge
• Low Standby Power： Need a solution to comply to future
energy efficiency regulations
Source: Consortium of Mobile-Phone Makers
• 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.
2
www.fairchildsemi.com
Smaller Form Factor Challenge
Design trend moving to even smaller form factors
• Reducing even more components
• Integration is necessary
3
www.fairchildsemi.com
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
4
www.fairchildsemi.com
Key Growth Area of AC-DC Power
Supplies – Mobile Communication
Worldwide Power Supply Market
20000
18000
Units in Millions
16000
14000
12000
UPS
10000
INVERTERS
8000
BATTERY CHARGERS
6000
DC-DC
4000
AC-DC
• Key growth area will be
communications, driven
by mobile phones
• A 60% increase in just
four years
2000
0
2009
2010
2011
2012
2013
2014
Years
Source: Selantek Power Supply Report 2010
5
www.fairchildsemi.com
Market Trend for Smart Devices
Unit：%
100
US Smart Phone Penetration
Feature Phone
90
Smart Phone
80
70
60
50
40
30
20
10
0
Note: Percentages may not total 100% because of rounding
Source: Forrester Research eReader Forecast, 2010 to 2015 (US)
Source：Nielson (2010/11)
• 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
6
www.fairchildsemi.com
System Losses at No Load
EMI Bleeding
Resistor Loss
EMI Filter
Bridge Diode
and Filtering
Snubber Loss
Core Loss
RCD snubber
Isolation
Rectification
AC
Vo
Power Switch
Switching Loss &
Gate Drive Loss
Start-up Resistor Loss
• Switching Loss
Shunt Regulator Divider
Resistive Loss
1
2
 COSS  VDS  fSW
2
• Conduction Loss
V2
R
PWM
Controller
Optocoupler
PWM IC Operation Loss
FB Loss
7
Error Amplifier
and Loop
Compensation
www.fairchildsemi.com
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).
8
www.fairchildsemi.com
Achieve Standby power <10 mW
• 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
9
www.fairchildsemi.com
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
Used for 5 W/85kHz
Dimensions:
16W x18D x 14H(mm)
=4032mm2
Dimensions:
12W x 12D x 9H(mm)
=1296mm2
10
www.fairchildsemi.com
Smaller Form Factor With VS OVP
VO
VDD
TL431
External 2nd side OVP circuit :
1. Photo coupler
2. TL431
3. 2x BJT
4. Capacitors and resistors
• Reduce PCB size by reducing external components with VS OVP
• VS OVP for safer system and reduced part count
11
www.fairchildsemi.com
Other Benefits from FAN302HL
 Good CV dynamic
 CV ±5% vs. CC ±10%
 Ripple < 100mV
 Meets Highest Efficiency Standards
CV & CC
± 5%
± 10%
CC from PSR
CV from SSR
12
www.fairchildsemi.com
Meeting Typical Application Specs
with FAN302HL
5 W Solution
Applications
Some Key
Specifications
10 W Solution
• Smart phone charger
• 5 V, 1 A
• Tablet PC charger
• 5 V, 2 A
• < 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
13
www.fairchildsemi.com
mWSaver™ Technology – Provides the
Best-in-Class Standby Power
• 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.
14
www.fairchildsemi.com
The Right Technology for Your Success™
Follow us on Twitter @ twitter.com/fairchildSemi
View product and company videos, listen to podcasts and comment on our blog @
www.fairchildsemi.com/engineeringconnections
Visit us on Facebook @ www.facebook.com/FairchildSemiconductor
15
www.fairchildsemi.com