Title: Achieving highefficiency design with Infineon CoolMOSTM and OptiMOSTM
1Achieving high-efficiency designwithInfineon
CoolMOSTM and OptiMOSTM
Power Technology Conference
- Materials re-organized by Jerome Lee
2New efficiency requirement in ATX silver box
- Climate Saver Computing Initiative (CSCI)
announce new initiative Platinum Standard.
Targeting 90 94 and 92 efficiency at 20 50
and 100 loading respectively. - New topology is blooming with better control
scheme. In which semi-conductor compensate the
limitation of the topology.
3Typical Solution for multi-output SMPSCross
Regulation Cost competitive but higher loss
Main Stage DC/DC Two transistor Forward
Mag Amp
PFC Pre-regulation CCM Boost
Auxilliary Converter FF Flyback
4Content
- Typical Solution of Silver Box and Losses
Analysis - Synchronous Rectification
- Energy Losses in synchronous with bridge primary
- Synchronous rectification MOSFET Selection
- Infineon OptiMOSTM for synchronous rectification
- Primary MOSFET
- Energy loss in hard switching system
- New CoolMOSTM C6 and Softswitching
- Higher efficiency with Infineon devices
5Losses Analysis (Overall System) Various AC
inputLosses break down (eg. 300W system with
three output)
6Losses Analysis (20 Load) - EMILosses break
down (eg. 300W system with three output)
- Low line / light load situation
Total 0.64W
7Losses Analysis (20 Load) - PFCLosses break
down (eg. 300W system with three output)
- Low line / light load situation
Total 5.44W
8Losses Analysis (20 Load) - DC/DCLosses break
down (eg. 300W system with three output)
- Low line / light load situation
??
Total 8.44W
9Content
- Typical Solution of Silver Box and Losses
Analysis - Synchronous Rectification
- Energy Losses in synchronous with bridge
configuration - Synchronous rectification MOSFET Selection
- Infineon OptiMOSTM for synchronous rectification
- Primary MOSFET
- Energy loss in hard switching system
- New CoolMOSTM C6 and Softswitching
- Higher efficiency with Infineon devices
10Synchronous RectificationWhat is a synchronous
rectifier?
diode
MOSFET
- a MOSFET (sync. FET) replaces a diode in its
electrical functionality - the sync. FET has NO control function ? no
active switching of current ? (gate) switching
speed has no influence on efficiency! - no additional function compared to the diode is
realized - with a gate-source short on the sync. FET, the
system stays electrically functionable
11Disassembling a MOSFETelectrical symbol with
parasitics?
ideal switch
12Synchronous Rectificationcommutation loop
example current doubler
freewheel
forward
L
OUT
1
High side switch
C
OUT
Transformer
GND
Low side switch
L
OUT
2
13Synchronous RectificationPower loss distribution
- 80V MOSFET technology transformer output 40V
Vout 12V
14Synchronous Rectificationbrief summary II
- Conducting losses
- Body diode conduction loss
- Gate losses
- Turn-off reverse recovery losses
Conduction
Switching
15Content
- Typical Solution of Silver Box and Losses
Analysis - Synchronous Rectification
- Energy Losses in synchronous with bridge primary
- Synchronous rectification MOSFET Selection
- Infineon OptiMOSTM for synchronous rectification
- Primary MOSFET
- Energy loss in hard switching system
- New CoolMOSTM C6 and Softswitching
- Higher efficiency with Infineon devices
16Disassembling a MOSFETpackage contribution to
total Rds(on)
package contribution to Rds(on) for best in class
devices
high package contribution, Si technology is
hindered by package
D²-Pak7pin
CanPAK M
CanPAK S
S3O8
TO-220
SuperSO8
D²-Pak
without layout contribution
17Synchronous RectificationLosses must be balanced!
Losses for a given output power and switching
frequency!
power losses W
3
capacitive losses dominate
balanced operation
2.5
2
conduction losses dominate
1.5
1
.5
0
0
5
10
15
20
25
Resistance mOhm
18Selection SR
RMS currentn Irms10A Target frequency
Fs100kHz Calculated voltage Vds40V Selection
BSC031N06N3 ?pcs
RMS Current
Switching frequency
19Choosing the right deviceFOM verification
- FOM Figure of merit (performance factor for a
given MOSFET technology) - The lower the FOM the better the technology
(lower losses)
20Choosing the right deviceFOM_Qoss verification
transformer voltage
Example FOMQoss for a 80V technology at various
transformer voltages VT
30
- Better FOMs for a given MOSFET technology by
- Reducing the maximum drain-source voltage
(transformer voltage) - Resulting in a lower Qoss gt lower power losses
21Choosing the right deviceFOM_Qoss verification
MOSFET voltage class
Example FOMQoss _at_ VT40V for a 40V, 60V, 80V and
100V technology
80
- Better FOM by
- Lower voltage class technology
22Choosing the right deviceFOM_Qoss verification
MOSFET Rdson class
Example FOMQoss _at_ VT40V for a 80V technology in
different Rds(on)/package combinations
- The higher the Rdson class, the better the
FOMQoss - With SuperSO8 good FOMQoss value can be achieved
- Need for a compromise
23Choosing the right devicePackaging
through-hole or SMD?
- SuperSO8 achieves efficiency than TO-220 due to
- Much lower RDSon contribution of the package
- Lower output capacitance -gt lower switching
losses - No optimization of the snubber was done
24Synchronous RectificationConclusion for RC and
RCD snubber
- RCD snubber can boost efficiency up to 0.5
- No additional capacitance in parallel to the
MOSFET is needed (lower reverse peak, lower
losses)
25Choosing the right devicePackaging importance
of mounting
- The longer the connection length of the MOSFET
the lower the efficiency, due to a higher
resistance value
26Choosing the right devicePackaging importance
of mounting
- Longer electrical MOSFET connections mean
- Higher inductance
- Higher voltage stress for the MOSFET
27Choosing the right deviceComparison BiC devices
SuperSO8 (40V,60V,80V)
- Lower the voltage class ? better FOM_Coss ?higher
efficiency
28LV-MOS and packagingsummary II
Source 0.2nH0.5mOhm
Drain (1cm) 8nH 0.55mOhm
Gate 0.5nH 35mOhm
Gate (1cm) 7nH 35mOhm
Drain 0nH 0mOhm
Source (1cm) 7nH0.55mOhm
29Content
- Typical Solution of Silver Box and Losses
Analysis - Synchronous Rectification
- Energy Losses in synchronous with bridge primary
- Synchronous rectification MOSFET Selection
- Infineon OptiMOSTM for synchronous rectification
- Primary MOSFET
- Energy loss in hard switching system
- New CoolMOSTM C6 and Softswitching
- Higher efficiency with Infineon devices
30OptiMOS3 Lowest Rds(on) for SR
- replacement parts for existing sockets
- new BiC devices in each voltage class from 30V to
150V
31OptiMOS3 Fast switching for HS and LS
60V
80V
40V
Best FOM
200V
100V
150V
32General guideline for MOSFET package selection
high
Switching Frequency
SuperSO8
S3O8
CanPAK-S
CanPAK-M
medium
D2-PAK (TO262)
D-PAK (TO252)
TO-220
D2-PAK-7Pin
medium
high
Output Power
33Content
- Typical Solution of Silver Box and Losses
Analysis - Synchronous Rectification
- Energy Losses in synchronous with bridge primary
- Synchronous rectification MOSFET Selection
- Infineon OptiMOSTM for synchronous rectification
- Primary MOSFET
- Energy loss in hard switching system
- New CoolMOSTM C6 and Softswitching
- Higher efficiency with Infineon devices
34Roadmap of HV MOSFET
- Losses come from
- Rdson 60 conduction loss
- Delay in on/off (Qg..)30 switching loss
- (Dis)Charge Cds Cap. 10 Coss loss
G
S
30
n
p
10
gt90 of conductionlosses come from n-epih
n-epi
60
nsub
- To make it better
- Better conductivity ?Lower Rdson
- Faster switching ? lower Qg
- Lower capacitances?Lower Coss,etc
D
35Losses ReductionChoosing the right RDSon for
the PFC MOSFET
- CoolMOSTM has unique feature to accommodate both
low Rdson (full load demand) as well as low
capacitive (Light load demand) - The usage of CoolMOSTM effectively balance the
loss in both light load and full load situation.
36Content
- Typical Solution of Silver Box and Losses
Analysis - Synchronous Rectification
- Energy Losses in synchronous with bridge primary
- Synchronous rectification MOSFET Selection
- Infineon OptiMOSTM for synchronous rectification
- Primary MOSFET
- Energy loss in hard switching system
- New CoolMOSTM C6 and Softswitching
- Higher efficiency with Infineon devices
37What is soft switching?
- The drain source voltage reaches zero before the
gate of the low side MOSFET turns on
Vmp
Pri Current
High Side Gate
Low Side Gate
38 ? C6 shows the best Figure-of-Merit RonEoss
and good FoM RonQoss
C6 behaviour in soft switching converters
150
18
125
15
Good Qoss for C6
100
12
Qoss nC
Eoss µJ
75
9
Best Eoss for C6
Qoss C6
50
6
Qoss C3
Qoss CP
Eoss C6
25
3
Eoss C3
Eoss CP
0
0
0
50
100
150
200
250
300
350
400
450
500
Voltage VDS V
39Hard commutation of body diode
Qrr C6 7.1µC trr C6 414ns
Qrr C3 9.6µC trr C3 510ns
IPP60R190C6
Qrr CFD 1.1µC trr CFD 155ns
? C6 shows less reverse recovery charge than C3
and better softness than CFD
- NO CFD-type required in applications with
non-repetitive hard diode commutation such as
LLC, phase shift ZVS etc.
C6 is the best choice for resonant topologies
40Efficiency difference for 99mOhm Parts in LLC
test circuit
- CP shows best efficiency
- C6 is very close to CP but in addition it offers
excellent commutation ruggedness - C6 can replace CP, C3 and CFD in resonant
topologies
41Content
- Typical Solution of Silver Box and Losses
Analysis - Synchronous Rectification
- Energy Losses in synchronous with bridge primary
- Synchronous rectification MOSFET Selection
- Infineon OptiMOSTM for synchronous rectification
- Primary MOSFET
- Energy loss in hard switching system
- New CoolMOSTM C6 and Softswitching
- Higher efficiency with Infineon devices
42Infineon Approach for Silver Box Solution-
Topology and labeling
400V
AC in
Voltage Regulation
N/A
Topology
PFC
DC/DC
Passive
Primary
Secondary
STF
Diode
CCM
TTF
Low Drop Schottky
Interleave Crit Mode
LLC
Sync Rec
Sync. Buck DC/DC
Active Clamp
Auxiliary / Standby Power
90 Plus
Fan Speed Controller
43Infineon Approach for Silver Box Solution-
Configuration
ICE1HS01G
IDT05S60C
BSC042N03LS G x 2 BSC042N03LS G x 2
ICE2PCS02 G
IPP037N06L3 G x 2
IPP60R190C6 x 2
IPP60R199CP
TDA21801
44Infineon Approach for Silver Box Solution-
90Plus Design Layout Compared with 80Plus Design
90Plus Design
80Plus Standard Design
45Superior Solutions from Superior Power
Semiconductors CoolMOS C6 600V Portfolio
TO-252 D-Pak D
TO-263 D²PAK B
TO-220 Fullpak A
TO-262 I²-PAK I
TO-220 P
TO-247 W
3.3 ? 1.8 A
IPD60R3k3C6
2 ? 2.5 A
IPD60R2k0C6
1.4 ? 3.2 A
IPP60R1k4C6
IPD60R1k4C6
0.95 ? 4.5 A
IPA60R950C6
IPP60R950C6
IPB60R950C6
IPD60R950C6
0.75 ? 6.2 A
IPP60R750C6
IPD60R750C6
0.6 ? 7.3 A
IPA60R600C6
IPP60R600C6
IPB60R600C6
IPD60R600C6
0.52 ? 8 A
IPA60R520C6
IPP60R520C6
IPD60R520C6
0.45 ? 9.5 A
IPA60R450C6
IPP60R450C6
IPD60R450C6
0.38 ? 11 A
IPA60R380C6
IPP60R380C6
IPB60R380C6
IPD60R380C6
IPI60R380C6
0.28 ? 15 A
IPA60R280C6
IPP60R280C6
IPB60R280C6
IPW60R280C6
IPI60R280C6
0.19 ? 20 A
IPA60R190C6
IPP60R190C6
IPB60R190C6
IPW60R190C6
IPI60R190C6
0.16 ? 24 A
IPA60R160C6
IPP60R160C6
IPB60R160C6
IPW60R160C6
0.125 ? 30 A
IPW60R125C6
IPP60R125C6
IPA60R125C6
0.099 ? 35 A
IPW60R099C6
IPP60R099C6
IPA60R099C6
IPB60R099C6
0.07 ? 47 A
IPW60R070C6
46OptiMOS Product Information
- Please visit for the latest OptiMOSTM technology
http//www.infineon.com/OptiMOS
47Reference
- Deboy Gerald, Fanny Bjoerk, Jon Hancock,
Application NoteCoolMOSTM CP- How to make most
beneficial use of the latest generation of super
junction technology devices. - Lutz Görgens, Maximizing the Effect of Modern
Low Voltage Power MOSFETs, APEC 2009. - Juan Sanchez, Extracted from various application
presentation example, 2009 - Moesslacher Christian, Extracted from various
application presentation example, 2009. - Matteo-Alessandro Kutschak, 90Plus Project.
- Christian Jeschko, Matteo Kutschak, 600V
CoolMOS C6
48(No Transcript)